1 files changed, 16 insertions, 1 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index f95d5bfe8248..182192892d45 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -106,7 +106,7 @@ extern int bus_unregister_notifier(struct bus_type *bus,
 
 /* All 4 notifers below get called with the target struct device *
  * as an argument. Note that those functions are likely to be called
- * with the device semaphore held in the core, so be careful.
+ * with the device lock held in the core, so be careful.
  */
 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
@@ -508,6 +508,21 @@ static inline bool device_async_suspend_enabled(struct device *dev)
         return !!dev->power.async_suspend;
 }
 
+static inline void device_lock(struct device *dev)
+{
+        down(&dev->sem);
+}
+
+static inline int device_trylock(struct device *dev)
+{
+        return down_trylock(&dev->sem);
+}
+
+static inline void device_unlock(struct device *dev)
+{
+        up(&dev->sem);
+}
+
 void driver_init(void);
 
 /*