diff --git a/[refs] b/[refs]
index dc12116acc43..4254ddaffff3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8413ac9d8c9a1366a4f57880723126cd24e5a5c3
+refs/heads/master: 51b07fc3c5c830bb49c80fc5eac041e1f66a72e7
diff --git a/trunk/fs/buffer.c b/trunk/fs/buffer.c
index ac78d4c19b3b..6569fda5cfed 100644
--- a/trunk/fs/buffer.c
+++ b/trunk/fs/buffer.c
@@ -76,8 +76,7 @@ EXPORT_SYMBOL(__lock_buffer);
 
 void unlock_buffer(struct buffer_head *bh)
 {
-	smp_mb__before_clear_bit();
-	clear_buffer_locked(bh);
+	clear_bit_unlock(BH_Lock, &bh->b_state);
 	smp_mb__after_clear_bit();
 	wake_up_bit(&bh->b_state, BH_Lock);
 }
diff --git a/trunk/include/linux/buffer_head.h b/trunk/include/linux/buffer_head.h
index eadaab44015f..3ce64b90118c 100644
--- a/trunk/include/linux/buffer_head.h
+++ b/trunk/include/linux/buffer_head.h
@@ -322,7 +322,7 @@ static inline void wait_on_buffer(struct buffer_head *bh)
 
 static inline int trylock_buffer(struct buffer_head *bh)
 {
-	return likely(!test_and_set_bit(BH_Lock, &bh->b_state));
+	return likely(!test_and_set_bit_lock(BH_Lock, &bh->b_state));
 }
 
 static inline void lock_buffer(struct buffer_head *bh)