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path: root/drivers/base/power/main.c
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Diffstat (limited to 'drivers/base/power/main.c')
-rw-r--r--drivers/base/power/main.c44
1 files changed, 12 insertions, 32 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 05dc8764e76..eb9f38d0aa5 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -20,64 +20,44 @@
*/
#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);
-
-/**
- * device_pm_set_parent - Specify power dependency.
- * @dev: Device who needs power.
- * @parent: Device that supplies power.
- *
- * This function is used to manually describe a power-dependency
- * relationship. It may be used to specify a transversal relationship
- * (where the power supplier is not the physical (or electrical)
- * ancestor of a specific device.
- * The effect of this is that the supplier will not be powered down
- * before the power dependent.
- */
-
-void device_pm_set_parent(struct device * dev, struct device * parent)
-{
- put_device(dev->power.pm_parent);
- dev->power.pm_parent = get_device(parent);
-}
-EXPORT_SYMBOL_GPL(device_pm_set_parent);
-
-int device_pm_add(struct device * dev)
+int device_pm_add(struct device *dev)
{
int error;
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)))
+ error = dpm_sysfs_add(dev);
+ if (error)
list_del(&dev->power.entry);
- up(&dpm_list_sem);
+ mutex_unlock(&dpm_list_mtx);
return error;
}
-void device_pm_remove(struct device * dev)
+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);
}