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Power Management: use mutexes instead of semaphores

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The Power Management code uses semaphores as mutexes.  Use the mutex API
instead of the (binary) semaphores.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Matthias Kaehlcke
2007-05-23 14:19:41 -07:00
committed by Greg Kroah-Hartman
parent 9f3f776bd9
commit 11048dcf33
5 changed files with 29 additions and 27 deletions
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14
drivers/base/power/main.c
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@@ -20,14 +20,16 @@
*/
#include <linux/device.h>
#include <linux/mutex.h>
#include "power.h"
LIST_HEAD(dpm_active);
LIST_HEAD(dpm_off);
LIST_HEAD(dpm_off_irq);
DECLARE_MUTEX(dpm_sem);
DECLARE_MUTEX(dpm_list_sem);
DEFINE_MUTEX(dpm_mtx);
DEFINE_MUTEX(dpm_list_mtx);
int (*platform_enable_wakeup)(struct device *dev, int is_on);
@@ -59,12 +61,12 @@ int device_pm_add(struct device * dev)
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
down(&dpm_list_sem);
mutex_lock(&dpm_list_mtx);
list_add_tail(&dev->power.entry, &dpm_active);
device_pm_set_parent(dev, dev->parent);
if ((error = dpm_sysfs_add(dev)))
list_del(&dev->power.entry);
up(&dpm_list_sem);
mutex_unlock(&dpm_list_mtx);
return error;
}
@@ -73,11 +75,11 @@ void device_pm_remove(struct device * dev)
pr_debug("PM: Removing info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
down(&dpm_list_sem);
mutex_lock(&dpm_list_mtx);
dpm_sysfs_remove(dev);
put_device(dev->power.pm_parent);
list_del_init(&dev->power.entry);
up(&dpm_list_sem);
mutex_unlock(&dpm_list_mtx);
}