--- save/fs/buffer.c	2006-03-27 10:39:53.000000000 +0200
+++ linux-2.6.16/fs/buffer.c	2006-03-27 10:40:46.000000000 +0200
@@ -78,6 +78,7 @@ EXPORT_SYMBOL(__lock_buffer);
 
 void fastcall unlock_buffer(struct buffer_head *bh)
 {
+	smp_mb__before_clear_bit();
 	clear_buffer_locked(bh);
 	smp_mb__after_clear_bit();
 	wake_up_bit(&bh->b_state, BH_Lock);