Power Management: use mutexes instead of semaphores

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>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 05dc8764e765..7b3cc3c15b9d 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -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);
 }