diff --git a/[refs] b/[refs]
index ba6a7fdd256e..dbd1872f3dea 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ac4accb2bd619380c2404f9064e91f48674c6eb8
+refs/heads/master: ef0d5b23022e207e9f367de52f4172daab3ac690
diff --git a/trunk/drivers/staging/hv/ring_buffer.c b/trunk/drivers/staging/hv/ring_buffer.c
index 3da333018b5a..932af1a01a1e 100644
--- a/trunk/drivers/staging/hv/ring_buffer.c
+++ b/trunk/drivers/staging/hv/ring_buffer.c
@@ -513,7 +513,7 @@ int hv_ringbuffer_read(struct hv_ring_buffer_info *inring_info, void *buffer,
 	/* Make sure all reads are done before we update the read index since */
 	/* the writer may start writing to the read area once the read index */
 	/*is updated */
-	mb();
+	smp_mb();
 
 	/* Update the read index */
 	hv_set_next_read_location(inring_info, next_read_location);