diff --git a/[refs] b/[refs]
index 773437c1ad6e..497da17665d7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 456be1484ffc72a24bdb4200b5847c4fa90139d9
+refs/heads/master: 834f9f61a525d2f6d3d0c93894e26326c8d3ceed
diff --git a/trunk/block/blk-flush.c b/trunk/block/blk-flush.c
index 491eb30a242d..89ae3b9bf7ca 100644
--- a/trunk/block/blk-flush.c
+++ b/trunk/block/blk-flush.c
@@ -320,7 +320,7 @@ void blk_insert_flush(struct request *rq)
 		return;
 	}
 
-	BUG_ON(!rq->bio || rq->bio != rq->biotail);
+	BUG_ON(rq->bio != rq->biotail); /*assumes zero or single bio rq */
 
 	/*
 	 * If there's data but flush is not necessary, the request can be