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-rw-r--r--fs/buffer.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 763c5b59492d..7ff6e9346fae 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -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);