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PNP: Convert pnp_lock into a mutex

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pnp_lock is a spinlock, but it is only acquired from process context,
so it may be a mutex just fine.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2015-03-18 22:39:55 +01:00
parent aee94467d9
commit 38f6b38dbb
4 changed files with 29 additions and 27 deletions
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2
drivers/pnp/base.h
View File

@ -3,7 +3,7 @@
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*/
extern spinlock_t pnp_lock;
extern struct mutex pnp_lock;
extern const struct attribute_group *pnp_dev_groups[];
void *pnp_alloc(long size);

25
drivers/pnp/card.c
View File

@ -5,6 +5,7 @@
*/
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/pnp.h>
@ -244,10 +245,10 @@ int pnp_add_card(struct pnp_card *card)
}
pnp_interface_attach_card(card);
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_add_tail(&card->global_list, &pnp_cards);
list_add_tail(&card->protocol_list, &card->protocol->cards);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
/* we wait until now to add devices in order to ensure the drivers
* will be able to use all of the related devices on the card
@ -276,10 +277,10 @@ void pnp_remove_card(struct pnp_card *card)
struct list_head *pos, *temp;
device_unregister(&card->dev);
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_del(&card->global_list);
list_del(&card->protocol_list);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
list_for_each_safe(pos, temp, &card->devices) {
struct pnp_dev *dev = card_to_pnp_dev(pos);
pnp_remove_card_device(dev);
@ -297,10 +298,10 @@ int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
dev->card_link = NULL;
dev_set_name(&dev->dev, "%02x:%02x.%02x",
dev->protocol->number, card->number, dev->number);
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
dev->card = card;
list_add_tail(&dev->card_list, &card->devices);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
return 0;
}
@ -310,10 +311,10 @@ int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
*/
void pnp_remove_card_device(struct pnp_dev *dev)
{
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
dev->card = NULL;
list_del(&dev->card_list);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
__pnp_remove_device(dev);
}
@ -426,9 +427,9 @@ int pnp_register_card_driver(struct pnp_card_driver *drv)
if (error < 0)
return error;
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_add_tail(&drv->global_list, &pnp_card_drivers);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
list_for_each_safe(pos, temp, &pnp_cards) {
struct pnp_card *card =
@ -444,9 +445,9 @@ int pnp_register_card_driver(struct pnp_card_driver *drv)
*/
void pnp_unregister_card_driver(struct pnp_card_driver *drv)
{
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_del(&drv->global_list);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
pnp_unregister_driver(&drv->link);
}

19
drivers/pnp/core.c
View File

@ -9,6 +9,7 @@
#include <linux/list.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
@ -19,7 +20,7 @@
static LIST_HEAD(pnp_protocols);
LIST_HEAD(pnp_global);
DEFINE_SPINLOCK(pnp_lock);
DEFINE_MUTEX(pnp_lock);
/*
* ACPI or PNPBIOS should tell us about all platform devices, so we can
@ -55,7 +56,7 @@ int pnp_register_protocol(struct pnp_protocol *protocol)
INIT_LIST_HEAD(&protocol->devices);
INIT_LIST_HEAD(&protocol->cards);
nodenum = 0;
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
/* assign the lowest unused number */
list_for_each(pos, &pnp_protocols) {
@ -67,7 +68,7 @@ int pnp_register_protocol(struct pnp_protocol *protocol)
}
list_add_tail(&protocol->protocol_list, &pnp_protocols);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
protocol->number = nodenum;
dev_set_name(&protocol->dev, "pnp%d", nodenum);
@ -80,9 +81,9 @@ int pnp_register_protocol(struct pnp_protocol *protocol)
*/
void pnp_unregister_protocol(struct pnp_protocol *protocol)
{
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_del(&protocol->protocol_list);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
device_unregister(&protocol->dev);
}
@ -161,10 +162,10 @@ int __pnp_add_device(struct pnp_dev *dev)
{
pnp_fixup_device(dev);
dev->status = PNP_READY;
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_add_tail(&dev->global_list, &pnp_global);
list_add_tail(&dev->protocol_list, &dev->protocol->devices);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
if (dev->protocol->can_wakeup)
device_set_wakeup_capable(&dev->dev,
dev->protocol->can_wakeup(dev));
@ -203,10 +204,10 @@ int pnp_add_device(struct pnp_dev *dev)
void __pnp_remove_device(struct pnp_dev *dev)
{
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
list_del(&dev->global_list);
list_del(&dev->protocol_list);
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
device_unregister(&dev->dev);
}

10
drivers/pnp/driver.c
View File

@ -58,22 +58,22 @@ static const struct pnp_device_id *match_device(struct pnp_driver *drv,
int pnp_device_attach(struct pnp_dev *pnp_dev)
{
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
if (pnp_dev->status != PNP_READY) {
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
return -EBUSY;
}
pnp_dev->status = PNP_ATTACHED;
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
return 0;
}
void pnp_device_detach(struct pnp_dev *pnp_dev)
{
spin_lock(&pnp_lock);
mutex_lock(&pnp_lock);
if (pnp_dev->status == PNP_ATTACHED)
pnp_dev->status = PNP_READY;
spin_unlock(&pnp_lock);
mutex_unlock(&pnp_lock);
pnp_disable_dev(pnp_dev);
}