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Diffstat (limited to 'include/linux/device.h')
-rw-r--r--include/linux/device.h17
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);
/*