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USB: usbatm: convert heavy init dances to kthread API

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This is an attempt to kill two birds with one stone.

First, we kill one more user of kernel_thread, which is scheduled
for removal. Second - we kill one of the last users of kill_proc -
the function which is also to be removed, because it uses a pid_t
which is not safe now.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Duncan Sands <baldrick@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pavel Emelyanov 2008-02-11 15:26:09 +03:00 committed by Greg Kroah-Hartman
parent 1409e8e0e4
commit c4504a7eb9
2 changed files with 15 additions and 12 deletions
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25
drivers/usb/atm/usbatm.c
View File

@ -80,6 +80,7 @@
#include <linux/stat.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/kthread.h>
#ifdef VERBOSE_DEBUG
static int usbatm_print_packet(const unsigned char *data, int len);
@ -1014,10 +1015,7 @@ static int usbatm_do_heavy_init(void *arg)
struct usbatm_data *instance = arg;
int ret;
daemonize(instance->driver->driver_name);
allow_signal(SIGTERM);
instance->thread_pid = current->pid;
complete(&instance->thread_started);
ret = instance->driver->heavy_init(instance, instance->usb_intf);
@ -1026,7 +1024,7 @@ static int usbatm_do_heavy_init(void *arg)
ret = usbatm_atm_init(instance);
mutex_lock(&instance->serialize);
instance->thread_pid = -1;
instance->thread = NULL;
mutex_unlock(&instance->serialize);
complete_and_exit(&instance->thread_exited, ret);
@ -1034,13 +1032,18 @@ static int usbatm_do_heavy_init(void *arg)
static int usbatm_heavy_init(struct usbatm_data *instance)
{
int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_FS | CLONE_FILES);
struct task_struct *t;
if (ret < 0) {
usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
return ret;
t = kthread_create(usbatm_do_heavy_init, instance,
instance->driver->driver_name);
if (IS_ERR(t)) {
usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
__func__, PTR_ERR(t));
return PTR_ERR(t);
}
instance->thread = t;
wake_up_process(t);
wait_for_completion(&instance->thread_started);
return 0;
@ -1124,7 +1127,7 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
mutex_init(&instance->serialize);
instance->thread_pid = -1;
instance->thread = NULL;
init_completion(&instance->thread_started);
init_completion(&instance->thread_exited);
@ -1287,8 +1290,8 @@ void usbatm_usb_disconnect(struct usb_interface *intf)
mutex_lock(&instance->serialize);
instance->disconnected = 1;
if (instance->thread_pid >= 0)
kill_proc(instance->thread_pid, SIGTERM, 1);
if (instance->thread != NULL)
send_sig(SIGTERM, instance->thread, 1);
mutex_unlock(&instance->serialize);
wait_for_completion(&instance->thread_exited);

2
drivers/usb/atm/usbatm.h
View File

@ -175,7 +175,7 @@ struct usbatm_data {
int disconnected;
/* heavy init */
int thread_pid;
struct task_struct *thread;
struct completion thread_started;
struct completion thread_exited;