diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7aa60c4..8f4fac8 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -263,6 +263,10 @@
 		blk_queue_exit(q);
 		return ERR_PTR(-EWOULDBLOCK);
 	}
+
+	rq->__data_len = 0;
+	rq->__sector = (sector_t) -1;
+	rq->bio = rq->biotail = NULL;
 	return rq;
 }
 EXPORT_SYMBOL(blk_mq_alloc_request);