linux/drivers/media/rc/rc-main.c

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/* rc-main.c - Remote Controller core module
*
* Copyright (C) 2009-2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <media/rc-core.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/input.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include "rc-core-priv.h"
/* Sizes are in bytes, 256 bytes allows for 32 entries on x64 */
#define IR_TAB_MIN_SIZE 256
#define IR_TAB_MAX_SIZE 8192
/* FIXME: IR_KEYPRESS_TIMEOUT should be protocol specific */
#define IR_KEYPRESS_TIMEOUT 250
/* Used to keep track of known keymaps */
static LIST_HEAD(rc_map_list);
static DEFINE_SPINLOCK(rc_map_lock);
static struct rc_map_list *seek_rc_map(const char *name)
{
struct rc_map_list *map = NULL;
spin_lock(&rc_map_lock);
list_for_each_entry(map, &rc_map_list, list) {
if (!strcmp(name, map->map.name)) {
spin_unlock(&rc_map_lock);
return map;
}
}
spin_unlock(&rc_map_lock);
return NULL;
}
struct rc_map *rc_map_get(const char *name)
{
struct rc_map_list *map;
map = seek_rc_map(name);
#ifdef MODULE
if (!map) {
int rc = request_module(name);
if (rc < 0) {
printk(KERN_ERR "Couldn't load IR keymap %s\n", name);
return NULL;
}
msleep(20); /* Give some time for IR to register */
map = seek_rc_map(name);
}
#endif
if (!map) {
printk(KERN_ERR "IR keymap %s not found\n", name);
return NULL;
}
printk(KERN_INFO "Registered IR keymap %s\n", map->map.name);
return &map->map;
}
EXPORT_SYMBOL_GPL(rc_map_get);
int rc_map_register(struct rc_map_list *map)
{
spin_lock(&rc_map_lock);
list_add_tail(&map->list, &rc_map_list);
spin_unlock(&rc_map_lock);
return 0;
}
EXPORT_SYMBOL_GPL(rc_map_register);
void rc_map_unregister(struct rc_map_list *map)
{
spin_lock(&rc_map_lock);
list_del(&map->list);
spin_unlock(&rc_map_lock);
}
EXPORT_SYMBOL_GPL(rc_map_unregister);
static struct rc_map_table empty[] = {
{ 0x2a, KEY_COFFEE },
};
static struct rc_map_list empty_map = {
.map = {
.scan = empty,
.size = ARRAY_SIZE(empty),
.rc_type = RC_TYPE_UNKNOWN, /* Legacy IR type */
.name = RC_MAP_EMPTY,
}
};
/**
* ir_create_table() - initializes a scancode table
* @rc_map: the rc_map to initialize
* @name: name to assign to the table
* @rc_type: ir type to assign to the new table
* @size: initial size of the table
* @return: zero on success or a negative error code
*
* This routine will initialize the rc_map and will allocate
* memory to hold at least the specified number of elements.
*/
static int ir_create_table(struct rc_map *rc_map,
const char *name, u64 rc_type, size_t size)
{
rc_map->name = name;
rc_map->rc_type = rc_type;
rc_map->alloc = roundup_pow_of_two(size * sizeof(struct rc_map_table));
rc_map->size = rc_map->alloc / sizeof(struct rc_map_table);
rc_map->scan = kmalloc(rc_map->alloc, GFP_KERNEL);
if (!rc_map->scan)
return -ENOMEM;
IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
rc_map->size, rc_map->alloc);
return 0;
}
/**
* ir_free_table() - frees memory allocated by a scancode table
* @rc_map: the table whose mappings need to be freed
*
* This routine will free memory alloctaed for key mappings used by given
* scancode table.
*/
static void ir_free_table(struct rc_map *rc_map)
{
rc_map->size = 0;
kfree(rc_map->scan);
rc_map->scan = NULL;
}
/**
* ir_resize_table() - resizes a scancode table if necessary
* @rc_map: the rc_map to resize
* @gfp_flags: gfp flags to use when allocating memory
* @return: zero on success or a negative error code
*
* This routine will shrink the rc_map if it has lots of
* unused entries and grow it if it is full.
*/
static int ir_resize_table(struct rc_map *rc_map, gfp_t gfp_flags)
{
unsigned int oldalloc = rc_map->alloc;
unsigned int newalloc = oldalloc;
struct rc_map_table *oldscan = rc_map->scan;
struct rc_map_table *newscan;
if (rc_map->size == rc_map->len) {
/* All entries in use -> grow keytable */
if (rc_map->alloc >= IR_TAB_MAX_SIZE)
return -ENOMEM;
newalloc *= 2;
IR_dprintk(1, "Growing table to %u bytes\n", newalloc);
}
if ((rc_map->len * 3 < rc_map->size) && (oldalloc > IR_TAB_MIN_SIZE)) {
/* Less than 1/3 of entries in use -> shrink keytable */
newalloc /= 2;
IR_dprintk(1, "Shrinking table to %u bytes\n", newalloc);
}
if (newalloc == oldalloc)
return 0;
newscan = kmalloc(newalloc, gfp_flags);
if (!newscan) {
IR_dprintk(1, "Failed to kmalloc %u bytes\n", newalloc);
return -ENOMEM;
}
memcpy(newscan, rc_map->scan, rc_map->len * sizeof(struct rc_map_table));
rc_map->scan = newscan;
rc_map->alloc = newalloc;
rc_map->size = rc_map->alloc / sizeof(struct rc_map_table);
kfree(oldscan);
return 0;
}
/**
* ir_update_mapping() - set a keycode in the scancode->keycode table
* @dev: the struct rc_dev device descriptor
* @rc_map: scancode table to be adjusted
* @index: index of the mapping that needs to be updated
* @keycode: the desired keycode
* @return: previous keycode assigned to the mapping
*
* This routine is used to update scancode->keycode mapping at given
* position.
*/
static unsigned int ir_update_mapping(struct rc_dev *dev,
struct rc_map *rc_map,
unsigned int index,
unsigned int new_keycode)
{
int old_keycode = rc_map->scan[index].keycode;
int i;
/* Did the user wish to remove the mapping? */
if (new_keycode == KEY_RESERVED || new_keycode == KEY_UNKNOWN) {
IR_dprintk(1, "#%d: Deleting scan 0x%04x\n",
index, rc_map->scan[index].scancode);
rc_map->len--;
memmove(&rc_map->scan[index], &rc_map->scan[index+ 1],
(rc_map->len - index) * sizeof(struct rc_map_table));
} else {
IR_dprintk(1, "#%d: %s scan 0x%04x with key 0x%04x\n",
index,
old_keycode == KEY_RESERVED ? "New" : "Replacing",
rc_map->scan[index].scancode, new_keycode);
rc_map->scan[index].keycode = new_keycode;
__set_bit(new_keycode, dev->input_dev->keybit);
}
if (old_keycode != KEY_RESERVED) {
/* A previous mapping was updated... */
__clear_bit(old_keycode, dev->input_dev->keybit);
/* ... but another scancode might use the same keycode */
for (i = 0; i < rc_map->len; i++) {
if (rc_map->scan[i].keycode == old_keycode) {
__set_bit(old_keycode, dev->input_dev->keybit);
break;
}
}
/* Possibly shrink the keytable, failure is not a problem */
ir_resize_table(rc_map, GFP_ATOMIC);
}
return old_keycode;
}
/**
* ir_establish_scancode() - set a keycode in the scancode->keycode table
* @dev: the struct rc_dev device descriptor
* @rc_map: scancode table to be searched
* @scancode: the desired scancode
* @resize: controls whether we allowed to resize the table to
* accommodate not yet present scancodes
* @return: index of the mapping containing scancode in question
* or -1U in case of failure.
*
* This routine is used to locate given scancode in rc_map.
* If scancode is not yet present the routine will allocate a new slot
* for it.
*/
static unsigned int ir_establish_scancode(struct rc_dev *dev,
struct rc_map *rc_map,
unsigned int scancode,
bool resize)
{
unsigned int i;
/*
* Unfortunately, some hardware-based IR decoders don't provide
* all bits for the complete IR code. In general, they provide only
* the command part of the IR code. Yet, as it is possible to replace
* the provided IR with another one, it is needed to allow loading
* IR tables from other remotes. So, we support specifying a mask to
* indicate the valid bits of the scancodes.
*/
if (dev->scanmask)
scancode &= dev->scanmask;
/* First check if we already have a mapping for this ir command */
for (i = 0; i < rc_map->len; i++) {
if (rc_map->scan[i].scancode == scancode)
return i;
/* Keytable is sorted from lowest to highest scancode */
if (rc_map->scan[i].scancode >= scancode)
break;
}
/* No previous mapping found, we might need to grow the table */
if (rc_map->size == rc_map->len) {
if (!resize || ir_resize_table(rc_map, GFP_ATOMIC))
return -1U;
}
/* i is the proper index to insert our new keycode */
if (i < rc_map->len)
memmove(&rc_map->scan[i + 1], &rc_map->scan[i],
(rc_map->len - i) * sizeof(struct rc_map_table));
rc_map->scan[i].scancode = scancode;
rc_map->scan[i].keycode = KEY_RESERVED;
rc_map->len++;
return i;
}
/**
* ir_setkeycode() - set a keycode in the scancode->keycode table
* @idev: the struct input_dev device descriptor
* @scancode: the desired scancode
* @keycode: result
* @return: -EINVAL if the keycode could not be inserted, otherwise zero.
*
* This routine is used to handle evdev EVIOCSKEY ioctl.
*/
static int ir_setkeycode(struct input_dev *idev,
const struct input_keymap_entry *ke,
unsigned int *old_keycode)
{
struct rc_dev *rdev = input_get_drvdata(idev);
struct rc_map *rc_map = &rdev->rc_map;
unsigned int index;
unsigned int scancode;
int retval = 0;
unsigned long flags;
spin_lock_irqsave(&rc_map->lock, flags);
if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
index = ke->index;
if (index >= rc_map->len) {
retval = -EINVAL;
goto out;
}
} else {
retval = input_scancode_to_scalar(ke, &scancode);
if (retval)
goto out;
index = ir_establish_scancode(rdev, rc_map, scancode, true);
if (index >= rc_map->len) {
retval = -ENOMEM;
goto out;
}
}
*old_keycode = ir_update_mapping(rdev, rc_map, index, ke->keycode);
out:
spin_unlock_irqrestore(&rc_map->lock, flags);
return retval;
}
/**
* ir_setkeytable() - sets several entries in the scancode->keycode table
* @dev: the struct rc_dev device descriptor
* @to: the struct rc_map to copy entries to
* @from: the struct rc_map to copy entries from
* @return: -ENOMEM if all keycodes could not be inserted, otherwise zero.
*
* This routine is used to handle table initialization.
*/
static int ir_setkeytable(struct rc_dev *dev,
const struct rc_map *from)
{
struct rc_map *rc_map = &dev->rc_map;
unsigned int i, index;
int rc;
rc = ir_create_table(rc_map, from->name,
from->rc_type, from->size);
if (rc)
return rc;
IR_dprintk(1, "Allocated space for %u keycode entries (%u bytes)\n",
rc_map->size, rc_map->alloc);
for (i = 0; i < from->size; i++) {
index = ir_establish_scancode(dev, rc_map,
from->scan[i].scancode, false);
if (index >= rc_map->len) {
rc = -ENOMEM;
break;
}
ir_update_mapping(dev, rc_map, index,
from->scan[i].keycode);
}
if (rc)
ir_free_table(rc_map);
return rc;
}
/**
* ir_lookup_by_scancode() - locate mapping by scancode
* @rc_map: the struct rc_map to search
* @scancode: scancode to look for in the table
* @return: index in the table, -1U if not found
*
* This routine performs binary search in RC keykeymap table for
* given scancode.
*/
static unsigned int ir_lookup_by_scancode(const struct rc_map *rc_map,
unsigned int scancode)
{
int start = 0;
int end = rc_map->len - 1;
int mid;
while (start <= end) {
mid = (start + end) / 2;
if (rc_map->scan[mid].scancode < scancode)
start = mid + 1;
else if (rc_map->scan[mid].scancode > scancode)
end = mid - 1;
else
return mid;
}
return -1U;
}
/**
* ir_getkeycode() - get a keycode from the scancode->keycode table
* @idev: the struct input_dev device descriptor
* @scancode: the desired scancode
* @keycode: used to return the keycode, if found, or KEY_RESERVED
* @return: always returns zero.
*
* This routine is used to handle evdev EVIOCGKEY ioctl.
*/
static int ir_getkeycode(struct input_dev *idev,
struct input_keymap_entry *ke)
{
struct rc_dev *rdev = input_get_drvdata(idev);
struct rc_map *rc_map = &rdev->rc_map;
struct rc_map_table *entry;
unsigned long flags;
unsigned int index;
unsigned int scancode;
int retval;
spin_lock_irqsave(&rc_map->lock, flags);
if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
index = ke->index;
} else {
retval = input_scancode_to_scalar(ke, &scancode);
if (retval)
goto out;
index = ir_lookup_by_scancode(rc_map, scancode);
}
if (index < rc_map->len) {
entry = &rc_map->scan[index];
ke->index = index;
ke->keycode = entry->keycode;
ke->len = sizeof(entry->scancode);
memcpy(ke->scancode, &entry->scancode, sizeof(entry->scancode));
} else if (!(ke->flags & INPUT_KEYMAP_BY_INDEX)) {
/*
* We do not really know the valid range of scancodes
* so let's respond with KEY_RESERVED to anything we
* do not have mapping for [yet].
*/
ke->index = index;
ke->keycode = KEY_RESERVED;
} else {
retval = -EINVAL;
goto out;
}
retval = 0;
out:
spin_unlock_irqrestore(&rc_map->lock, flags);
return retval;
}
/**
* rc_g_keycode_from_table() - gets the keycode that corresponds to a scancode
* @dev: the struct rc_dev descriptor of the device
* @scancode: the scancode to look for
* @return: the corresponding keycode, or KEY_RESERVED
*
* This routine is used by drivers which need to convert a scancode to a
* keycode. Normally it should not be used since drivers should have no
* interest in keycodes.
*/
u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 scancode)
{
struct rc_map *rc_map = &dev->rc_map;
unsigned int keycode;
unsigned int index;
unsigned long flags;
spin_lock_irqsave(&rc_map->lock, flags);
index = ir_lookup_by_scancode(rc_map, scancode);
keycode = index < rc_map->len ?
rc_map->scan[index].keycode : KEY_RESERVED;
spin_unlock_irqrestore(&rc_map->lock, flags);
if (keycode != KEY_RESERVED)
IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n",
dev->input_name, scancode, keycode);
return keycode;
}
EXPORT_SYMBOL_GPL(rc_g_keycode_from_table);
/**
* ir_do_keyup() - internal function to signal the release of a keypress
* @dev: the struct rc_dev descriptor of the device
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
* @sync: whether or not to call input_sync
*
* This function is used internally to release a keypress, it must be
* called with keylock held.
*/
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
static void ir_do_keyup(struct rc_dev *dev, bool sync)
{
if (!dev->keypressed)
return;
IR_dprintk(1, "keyup key 0x%04x\n", dev->last_keycode);
input_report_key(dev->input_dev, dev->last_keycode, 0);
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
if (sync)
input_sync(dev->input_dev);
dev->keypressed = false;
}
/**
* rc_keyup() - signals the release of a keypress
* @dev: the struct rc_dev descriptor of the device
*
* This routine is used to signal that a key has been released on the
* remote control.
*/
void rc_keyup(struct rc_dev *dev)
{
unsigned long flags;
spin_lock_irqsave(&dev->keylock, flags);
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
ir_do_keyup(dev, true);
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_keyup);
/**
* ir_timer_keyup() - generates a keyup event after a timeout
* @cookie: a pointer to the struct rc_dev for the device
*
* This routine will generate a keyup event some time after a keydown event
* is generated when no further activity has been detected.
*/
static void ir_timer_keyup(unsigned long cookie)
{
struct rc_dev *dev = (struct rc_dev *)cookie;
unsigned long flags;
/*
* ir->keyup_jiffies is used to prevent a race condition if a
* hardware interrupt occurs at this point and the keyup timer
* event is moved further into the future as a result.
*
* The timer will then be reactivated and this function called
* again in the future. We need to exit gracefully in that case
* to allow the input subsystem to do its auto-repeat magic or
* a keyup event might follow immediately after the keydown.
*/
spin_lock_irqsave(&dev->keylock, flags);
if (time_is_before_eq_jiffies(dev->keyup_jiffies))
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
ir_do_keyup(dev, true);
spin_unlock_irqrestore(&dev->keylock, flags);
}
/**
* rc_repeat() - signals that a key is still pressed
* @dev: the struct rc_dev descriptor of the device
*
* This routine is used by IR decoders when a repeat message which does
* not include the necessary bits to reproduce the scancode has been
* received.
*/
void rc_repeat(struct rc_dev *dev)
{
unsigned long flags;
spin_lock_irqsave(&dev->keylock, flags);
input_event(dev->input_dev, EV_MSC, MSC_SCAN, dev->last_scancode);
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
input_sync(dev->input_dev);
if (!dev->keypressed)
goto out;
dev->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
out:
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_repeat);
/**
* ir_do_keydown() - internal function to process a keypress
* @dev: the struct rc_dev descriptor of the device
* @scancode: the scancode of the keypress
* @keycode: the keycode of the keypress
* @toggle: the toggle value of the keypress
*
* This function is used internally to register a keypress, it must be
* called with keylock held.
*/
static void ir_do_keydown(struct rc_dev *dev, int scancode,
u32 keycode, u8 toggle)
{
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
bool new_event = !dev->keypressed ||
dev->last_scancode != scancode ||
dev->last_toggle != toggle;
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
if (new_event && dev->keypressed)
ir_do_keyup(dev, false);
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
input_event(dev->input_dev, EV_MSC, MSC_SCAN, scancode);
[media] rc: call input_sync after scancode reports Due to commit cdda911c34006f1089f3c87b1a1f31ab3a4722f2, evdev only becomes readable when the buffer contains an EV_SYN/SYN_REPORT event. If we get a repeat or a scancode we don't have a mapping for, we never call input_sync, and thus those events don't get reported in a timely fashion. For example, take an mceusb transceiver with a default rc6 keymap. Press buttons on an rc5 remote while monitoring with ir-keytable, and you'll see nothing. Now press a button on the rc6 remote matching the keymap. You'll suddenly get the rc5 key scancodes, the rc6 scancode and the rc6 key spit out all at the same time. Pressing and holding a button on a remote we do have a keymap for also works rather unreliably right now, due to repeat events also happening without a call to input_sync (we bail from ir_do_keydown before getting to the point where it calls input_sync). Easy fix though, just add two strategically placed input_sync calls right after our input_event calls for EV_MSC, and all is well again. Technically, we probably should have been doing this all along, its just that it never caused any functional difference until the referenced change went into the input layer. input_sync once per IR signal. There was another hidden bug in the code where we were calling input_report_key using last_keycode instead of our just discovered keycode, which manifested with the reordering of calling input_report_key and setting last_keycode. Reported-by: Stephan Raue <sraue@openelec.tv> CC: Stephan Raue <sraue@openelec.tv> CC: Mauro Carvalho Chehab <mchehab@redhat.com> CC: Jeff Brown <jeffbrown@android.com> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-06-23 21:40:55 +08:00
if (new_event && keycode != KEY_RESERVED) {
/* Register a keypress */
dev->keypressed = true;
dev->last_scancode = scancode;
dev->last_toggle = toggle;
dev->last_keycode = keycode;
IR_dprintk(1, "%s: key down event, "
"key 0x%04x, scancode 0x%04x\n",
dev->input_name, keycode, scancode);
input_report_key(dev->input_dev, keycode, 1);
}
input_sync(dev->input_dev);
}
/**
* rc_keydown() - generates input event for a key press
* @dev: the struct rc_dev descriptor of the device
* @scancode: the scancode that we're seeking
* @toggle: the toggle value (protocol dependent, if the protocol doesn't
* support toggle values, this should be set to zero)
*
* This routine is used to signal that a key has been pressed on the
* remote control.
*/
void rc_keydown(struct rc_dev *dev, int scancode, u8 toggle)
{
unsigned long flags;
u32 keycode = rc_g_keycode_from_table(dev, scancode);
spin_lock_irqsave(&dev->keylock, flags);
ir_do_keydown(dev, scancode, keycode, toggle);
if (dev->keypressed) {
dev->keyup_jiffies = jiffies + msecs_to_jiffies(IR_KEYPRESS_TIMEOUT);
mod_timer(&dev->timer_keyup, dev->keyup_jiffies);
}
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_keydown);
/**
* rc_keydown_notimeout() - generates input event for a key press without
* an automatic keyup event at a later time
* @dev: the struct rc_dev descriptor of the device
* @scancode: the scancode that we're seeking
* @toggle: the toggle value (protocol dependent, if the protocol doesn't
* support toggle values, this should be set to zero)
*
* This routine is used to signal that a key has been pressed on the
* remote control. The driver must manually call rc_keyup() at a later stage.
*/
void rc_keydown_notimeout(struct rc_dev *dev, int scancode, u8 toggle)
{
unsigned long flags;
u32 keycode = rc_g_keycode_from_table(dev, scancode);
spin_lock_irqsave(&dev->keylock, flags);
ir_do_keydown(dev, scancode, keycode, toggle);
spin_unlock_irqrestore(&dev->keylock, flags);
}
EXPORT_SYMBOL_GPL(rc_keydown_notimeout);
static int ir_open(struct input_dev *idev)
{
struct rc_dev *rdev = input_get_drvdata(idev);
return rdev->open(rdev);
}
static void ir_close(struct input_dev *idev)
{
struct rc_dev *rdev = input_get_drvdata(idev);
if (rdev)
rdev->close(rdev);
}
/* class for /sys/class/rc */
static char *rc_devnode(struct device *dev, umode_t *mode)
{
return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
}
static struct class rc_class = {
.name = "rc",
.devnode = rc_devnode,
};
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
/*
* These are the protocol textual descriptions that are
* used by the sysfs protocols file. Note that the order
* of the entries is relevant.
*/
static struct {
u64 type;
char *name;
} proto_names[] = {
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
{ RC_BIT_NONE, "none" },
{ RC_BIT_OTHER, "other" },
{ RC_BIT_UNKNOWN, "unknown" },
{ RC_BIT_RC5 |
RC_BIT_RC5X, "rc-5" },
{ RC_BIT_NEC, "nec" },
{ RC_BIT_RC6_0 |
RC_BIT_RC6_6A_20 |
RC_BIT_RC6_6A_24 |
RC_BIT_RC6_6A_32 |
RC_BIT_RC6_MCE, "rc-6" },
{ RC_BIT_JVC, "jvc" },
{ RC_BIT_SONY12 |
RC_BIT_SONY15 |
RC_BIT_SONY20, "sony" },
{ RC_BIT_RC5_SZ, "rc-5-sz" },
{ RC_BIT_SANYO, "sanyo" },
{ RC_BIT_MCE_KBD, "mce_kbd" },
{ RC_BIT_LIRC, "lirc" },
};
/**
* show_protocols() - shows the current IR protocol(s)
* @device: the device descriptor
* @mattr: the device attribute struct (unused)
* @buf: a pointer to the output buffer
*
* This routine is a callback routine for input read the IR protocol type(s).
* it is trigged by reading /sys/class/rc/rc?/protocols.
* It returns the protocol names of supported protocols.
* Enabled protocols are printed in brackets.
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
*
* dev->lock is taken to guard against races between device
* registration, store_protocols and show_protocols.
*/
static ssize_t show_protocols(struct device *device,
struct device_attribute *mattr, char *buf)
{
struct rc_dev *dev = to_rc_dev(device);
u64 allowed, enabled;
char *tmp = buf;
int i;
/* Device is being removed */
if (!dev)
return -EINVAL;
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
mutex_lock(&dev->lock);
if (dev->driver_type == RC_DRIVER_SCANCODE) {
enabled = dev->rc_map.rc_type;
allowed = dev->allowed_protos;
} else if (dev->raw) {
enabled = dev->raw->enabled_protocols;
allowed = ir_raw_get_allowed_protocols();
} else {
mutex_unlock(&dev->lock);
return -ENODEV;
}
IR_dprintk(1, "allowed - 0x%llx, enabled - 0x%llx\n",
(long long)allowed,
(long long)enabled);
for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
if (allowed & enabled & proto_names[i].type)
tmp += sprintf(tmp, "[%s] ", proto_names[i].name);
else if (allowed & proto_names[i].type)
tmp += sprintf(tmp, "%s ", proto_names[i].name);
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
if (allowed & proto_names[i].type)
allowed &= ~proto_names[i].type;
}
if (tmp != buf)
tmp--;
*tmp = '\n';
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
mutex_unlock(&dev->lock);
return tmp + 1 - buf;
}
/**
* store_protocols() - changes the current IR protocol(s)
* @device: the device descriptor
* @mattr: the device attribute struct (unused)
* @buf: a pointer to the input buffer
* @len: length of the input buffer
*
* This routine is for changing the IR protocol type.
* It is trigged by writing to /sys/class/rc/rc?/protocols.
* Writing "+proto" will add a protocol to the list of enabled protocols.
* Writing "-proto" will remove a protocol from the list of enabled protocols.
* Writing "proto" will enable only "proto".
* Writing "none" will disable all protocols.
* Returns -EINVAL if an invalid protocol combination or unknown protocol name
* is used, otherwise @len.
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
*
* dev->lock is taken to guard against races between device
* registration, store_protocols and show_protocols.
*/
static ssize_t store_protocols(struct device *device,
struct device_attribute *mattr,
const char *data,
size_t len)
{
struct rc_dev *dev = to_rc_dev(device);
bool enable, disable;
const char *tmp;
u64 type;
u64 mask;
int rc, i, count = 0;
unsigned long flags;
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
ssize_t ret;
/* Device is being removed */
if (!dev)
return -EINVAL;
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
mutex_lock(&dev->lock);
if (dev->driver_type == RC_DRIVER_SCANCODE)
type = dev->rc_map.rc_type;
else if (dev->raw)
type = dev->raw->enabled_protocols;
else {
IR_dprintk(1, "Protocol switching not supported\n");
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
ret = -EINVAL;
goto out;
}
while ((tmp = strsep((char **) &data, " \n")) != NULL) {
if (!*tmp)
break;
if (*tmp == '+') {
enable = true;
disable = false;
tmp++;
} else if (*tmp == '-') {
enable = false;
disable = true;
tmp++;
} else {
enable = false;
disable = false;
}
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
if (!strcasecmp(tmp, proto_names[i].name)) {
mask = proto_names[i].type;
break;
}
}
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
if (i == ARRAY_SIZE(proto_names)) {
IR_dprintk(1, "Unknown protocol: '%s'\n", tmp);
ret = -EINVAL;
goto out;
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
}
count++;
if (enable)
type |= mask;
else if (disable)
type &= ~mask;
else
type = mask;
}
if (!count) {
IR_dprintk(1, "Protocol not specified\n");
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
ret = -EINVAL;
goto out;
}
if (dev->change_protocol) {
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
rc = dev->change_protocol(dev, &type);
if (rc < 0) {
IR_dprintk(1, "Error setting protocols to 0x%llx\n",
(long long)type);
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
ret = -EINVAL;
goto out;
}
}
if (dev->driver_type == RC_DRIVER_SCANCODE) {
spin_lock_irqsave(&dev->rc_map.lock, flags);
dev->rc_map.rc_type = type;
spin_unlock_irqrestore(&dev->rc_map.lock, flags);
} else {
dev->raw->enabled_protocols = type;
}
IR_dprintk(1, "Current protocol(s): 0x%llx\n",
(long long)type);
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
ret = len;
out:
mutex_unlock(&dev->lock);
return ret;
}
static void rc_dev_release(struct device *device)
{
}
#define ADD_HOTPLUG_VAR(fmt, val...) \
do { \
int err = add_uevent_var(env, fmt, val); \
if (err) \
return err; \
} while (0)
static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
{
struct rc_dev *dev = to_rc_dev(device);
if (!dev || !dev->input_dev)
return -ENODEV;
if (dev->rc_map.name)
ADD_HOTPLUG_VAR("NAME=%s", dev->rc_map.name);
if (dev->driver_name)
ADD_HOTPLUG_VAR("DRV_NAME=%s", dev->driver_name);
return 0;
}
/*
* Static device attribute struct with the sysfs attributes for IR's
*/
static DEVICE_ATTR(protocols, S_IRUGO | S_IWUSR,
show_protocols, store_protocols);
static struct attribute *rc_dev_attrs[] = {
&dev_attr_protocols.attr,
NULL,
};
static struct attribute_group rc_dev_attr_grp = {
.attrs = rc_dev_attrs,
};
static const struct attribute_group *rc_dev_attr_groups[] = {
&rc_dev_attr_grp,
NULL
};
static struct device_type rc_dev_type = {
.groups = rc_dev_attr_groups,
.release = rc_dev_release,
.uevent = rc_dev_uevent,
};
struct rc_dev *rc_allocate_device(void)
{
struct rc_dev *dev;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
dev->input_dev = input_allocate_device();
if (!dev->input_dev) {
kfree(dev);
return NULL;
}
dev->input_dev->getkeycode = ir_getkeycode;
dev->input_dev->setkeycode = ir_setkeycode;
input_set_drvdata(dev->input_dev, dev);
spin_lock_init(&dev->rc_map.lock);
spin_lock_init(&dev->keylock);
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
mutex_init(&dev->lock);
setup_timer(&dev->timer_keyup, ir_timer_keyup, (unsigned long)dev);
dev->dev.type = &rc_dev_type;
dev->dev.class = &rc_class;
device_initialize(&dev->dev);
__module_get(THIS_MODULE);
return dev;
}
EXPORT_SYMBOL_GPL(rc_allocate_device);
void rc_free_device(struct rc_dev *dev)
{
if (!dev)
return;
if (dev->input_dev)
input_free_device(dev->input_dev);
put_device(&dev->dev);
kfree(dev);
module_put(THIS_MODULE);
}
EXPORT_SYMBOL_GPL(rc_free_device);
int rc_register_device(struct rc_dev *dev)
{
static bool raw_init = false; /* raw decoders loaded? */
static atomic_t devno = ATOMIC_INIT(0);
struct rc_map *rc_map;
const char *path;
int rc;
if (!dev || !dev->map_name)
return -EINVAL;
rc_map = rc_map_get(dev->map_name);
if (!rc_map)
rc_map = rc_map_get(RC_MAP_EMPTY);
if (!rc_map || !rc_map->scan || rc_map->size == 0)
return -EINVAL;
set_bit(EV_KEY, dev->input_dev->evbit);
set_bit(EV_REP, dev->input_dev->evbit);
set_bit(EV_MSC, dev->input_dev->evbit);
set_bit(MSC_SCAN, dev->input_dev->mscbit);
if (dev->open)
dev->input_dev->open = ir_open;
if (dev->close)
dev->input_dev->close = ir_close;
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
/*
* Take the lock here, as the device sysfs node will appear
* when device_add() is called, which may trigger an ir-keytable udev
* rule, which will in turn call show_protocols and access either
* dev->rc_map.rc_type or dev->raw->enabled_protocols before it has
* been initialized.
*/
mutex_lock(&dev->lock);
dev->devno = (unsigned long)(atomic_inc_return(&devno) - 1);
dev_set_name(&dev->dev, "rc%ld", dev->devno);
dev_set_drvdata(&dev->dev, dev);
rc = device_add(&dev->dev);
if (rc)
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
goto out_unlock;
rc = ir_setkeytable(dev, rc_map);
if (rc)
goto out_dev;
dev->input_dev->dev.parent = &dev->dev;
memcpy(&dev->input_dev->id, &dev->input_id, sizeof(dev->input_id));
dev->input_dev->phys = dev->input_phys;
dev->input_dev->name = dev->input_name;
rc = input_register_device(dev->input_dev);
if (rc)
goto out_table;
/*
* Default delay of 250ms is too short for some protocols, especially
* since the timeout is currently set to 250ms. Increase it to 500ms,
* to avoid wrong repetition of the keycodes. Note that this must be
* set after the call to input_register_device().
*/
dev->input_dev->rep[REP_DELAY] = 500;
/*
* As a repeat event on protocols like RC-5 and NEC take as long as
* 110/114ms, using 33ms as a repeat period is not the right thing
* to do.
*/
dev->input_dev->rep[REP_PERIOD] = 125;
path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
printk(KERN_INFO "%s: %s as %s\n",
dev_name(&dev->dev),
dev->input_name ? dev->input_name : "Unspecified device",
path ? path : "N/A");
kfree(path);
if (dev->driver_type == RC_DRIVER_IR_RAW) {
/* Load raw decoders, if they aren't already */
if (!raw_init) {
IR_dprintk(1, "Loading raw decoders\n");
ir_raw_init();
raw_init = true;
}
rc = ir_raw_event_register(dev);
if (rc < 0)
goto out_input;
}
if (dev->change_protocol) {
[media] rc-core: add separate defines for protocol bitmaps and numbers The RC_TYPE_* defines are currently used both where a single protocol is expected and where a bitmap of protocols is expected. Functions like rc_keydown() and functions which add/remove entries to the keytable want a single protocol. Future userspace APIs would also benefit from numeric protocols (rather than bitmap ones). Keytables are smaller if they can use a small(ish) integer rather than a bitmap. Other functions or struct members (e.g. allowed_protos, enabled_protocols, etc) accept multiple protocols and need a bitmap. Using different types reduces the risk of programmer error. Using a protocol enum whereever possible also makes for a more future-proof user-space API as we don't need to worry about a sufficient number of bits being available (e.g. in structs used for ioctl() calls). The use of both a number and a corresponding bit is dalso one in e.g. the input subsystem as well (see all the references to set/clear bit when changing keytables for example). This patch separate the different usages in preparation for upcoming patches. Where a single protocol is expected, enum rc_type is used; where one or more protocol(s) are expected, something like u64 is used. The patch has been rewritten so that the format of the sysfs "protocols" file is no longer altered (at the loss of some detail). The file itself should probably be deprecated in the future though. Signed-off-by: David Härdeman <david@hardeman.nu> Cc: Andy Walls <awalls@md.metrocast.net> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-10-12 06:11:54 +08:00
u64 rc_type = (1 << rc_map->rc_type);
rc = dev->change_protocol(dev, &rc_type);
if (rc < 0)
goto out_raw;
}
mutex_unlock(&dev->lock);
IR_dprintk(1, "Registered rc%ld (driver: %s, remote: %s, mode %s)\n",
dev->devno,
dev->driver_name ? dev->driver_name : "unknown",
rc_map->name ? rc_map->name : "unknown",
dev->driver_type == RC_DRIVER_IR_RAW ? "raw" : "cooked");
return 0;
out_raw:
if (dev->driver_type == RC_DRIVER_IR_RAW)
ir_raw_event_unregister(dev);
out_input:
input_unregister_device(dev->input_dev);
dev->input_dev = NULL;
out_table:
ir_free_table(&dev->rc_map);
out_dev:
device_del(&dev->dev);
[media] rc: add locking to fix register/show race When device_add is called in rc_register_device, the rc sysfs nodes show up, and there's a window in which ir-keytable can be launched via udev and trigger a show_protocols call, which runs without various rc_dev fields filled in yet. Add some locking around registration and store/show_protocols to prevent that from happening. The problem manifests thusly: [64692.957872] BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 [64692.957878] IP: [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957890] PGD 19cfc7067 PUD 19cfc6067 PMD 0 [64692.957894] Oops: 0000 [#1] SMP [64692.957897] last sysfs file: /sys/devices/pci0000:00/0000:00:03.1/usb3/3-1/3-1:1.0/rc/rc2/protocols [64692.957902] CPU 3 [64692.957903] Modules linked in: redrat3(+) ir_lirc_codec lirc_dev ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder rc_hauppauge ir_nec _decoder rc_core ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables snd_emu10k1_synth snd_emux_synth snd_seq_virmidi snd_seq_mi di_event snd_seq_midi_emul snd_emu10k1 snd_rawmidi snd_ac97_codec ac97_bus snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem pcsp kr tg3 snd_hwdep emu10k1_gp snd amd64_edac_mod gameport edac_core soundcore edac_mce_amd k8temp shpchp i2c_piix4 lm63 e100 mii uinput ipv6 raid0 rai d1 ata_generic firewire_ohci pata_acpi firewire_core crc_itu_t sata_svw pata_serverworks floppy radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core [last unloaded: redrat3] [64692.957949] [64692.957952] Pid: 12265, comm: ir-keytable Tainted: G M W 2.6.39-rc6+ #2 empty empty/TYAN Thunder K8HM S3892 [64692.957957] RIP: 0010:[<ffffffffa036a4c1>] [<ffffffffa036a4c1>] show_protocols+0x47/0xf1 [rc_core] [64692.957962] RSP: 0018:ffff880194509e38 EFLAGS: 00010202 [64692.957964] RAX: 0000000000000000 RBX: ffffffffa036d1e0 RCX: ffffffffa036a47a [64692.957966] RDX: ffff88019a84d000 RSI: ffffffffa036d1e0 RDI: ffff88019cf2f3f0 [64692.957969] RBP: ffff880194509e68 R08: 0000000000000002 R09: 0000000000000000 [64692.957971] R10: 0000000000000002 R11: 0000000000001617 R12: ffff88019a84d000 [64692.957973] R13: 0000000000001000 R14: ffff8801944d2e38 R15: ffff88019ce5f190 [64692.957976] FS: 00007f0a30c9a720(0000) GS:ffff88019fc00000(0000) knlGS:0000000000000000 [64692.957979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [64692.957981] CR2: 0000000000000090 CR3: 000000019a8e0000 CR4: 00000000000006e0 [64692.957983] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [64692.957986] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [64692.957989] Process ir-keytable (pid: 12265, threadinfo ffff880194508000, task ffff88019a9fc720) [64692.957991] Stack: [64692.957992] 0000000000000002 ffffffffa036d1e0 ffff880194509f58 0000000000001000 [64692.957997] ffff8801944d2e38 ffff88019ce5f190 ffff880194509e98 ffffffff8131484b [64692.958001] ffffffff8118e923 ffffffff810e9b2f ffff880194509e98 ffff8801944d2e18 [64692.958005] Call Trace: [64692.958014] [<ffffffff8131484b>] dev_attr_show+0x27/0x4e [64692.958014] [<ffffffff8118e923>] ? sysfs_read_file+0x94/0x172 [64692.958014] [<ffffffff810e9b2f>] ? __get_free_pages+0x16/0x52 [64692.958014] [<ffffffff8118e94c>] sysfs_read_file+0xbd/0x172 [64692.958014] [<ffffffff8113205e>] vfs_read+0xac/0xf3 [64692.958014] [<ffffffff8113347b>] ? fget_light+0x3a/0xa1 [64692.958014] [<ffffffff811320f2>] sys_read+0x4d/0x74 [64692.958014] [<ffffffff814c19c2>] system_call_fastpath+0x16/0x1b Its a bit difficult to reproduce, but I'm fairly confident this has fixed the problem. Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2011-05-12 02:14:31 +08:00
out_unlock:
mutex_unlock(&dev->lock);
return rc;
}
EXPORT_SYMBOL_GPL(rc_register_device);
void rc_unregister_device(struct rc_dev *dev)
{
if (!dev)
return;
del_timer_sync(&dev->timer_keyup);
if (dev->driver_type == RC_DRIVER_IR_RAW)
ir_raw_event_unregister(dev);
/* Freeing the table should also call the stop callback */
ir_free_table(&dev->rc_map);
IR_dprintk(1, "Freed keycode table\n");
input_unregister_device(dev->input_dev);
dev->input_dev = NULL;
device_del(&dev->dev);
rc_free_device(dev);
}
EXPORT_SYMBOL_GPL(rc_unregister_device);
/*
* Init/exit code for the module. Basically, creates/removes /sys/class/rc
*/
static int __init rc_core_init(void)
{
int rc = class_register(&rc_class);
if (rc) {
printk(KERN_ERR "rc_core: unable to register rc class\n");
return rc;
}
rc_map_register(&empty_map);
return 0;
}
static void __exit rc_core_exit(void)
{
class_unregister(&rc_class);
rc_map_unregister(&empty_map);
}
subsys_initcall(rc_core_init);
module_exit(rc_core_exit);
int rc_core_debug; /* ir_debug level (0,1,2) */
EXPORT_SYMBOL_GPL(rc_core_debug);
module_param_named(debug, rc_core_debug, int, 0644);
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_LICENSE("GPL");