driver model: replace rwlock in struct bus_type with a rwsem.

Synchronize all walks of the device and driver lists of a bus with an rwsem wrapped
around the entire iterator, instead of using device_lock and dropping it after we 
grabbed each node. 

Note this also prevents deadlock when walking the list of drivers and calling 
get_driver(), since get_driver() tries to take device_lock while we already have it
held.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index 112fca2dd2d8..c0f8d6c5e4bf 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -54,7 +54,7 @@ struct device_class;
 
 struct bus_type {
 	char			* name;
-	rwlock_t		lock;
+	struct rw_semaphore	rwsem;
 	atomic_t		refcount;
 	u32			present;