diff --git a/block/blk-mq.c b/block/blk-mq.c
index 97ebb84b5..1a41d7a 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -152,6 +152,16 @@
 }
 EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
 
+void blk_mq_wake_waiters(struct request_queue *q)
+{
+	struct blk_mq_hw_ctx *hctx;
+	unsigned int i;
+
+	queue_for_each_hw_ctx(q, hctx, i)
+		if (blk_mq_hw_queue_mapped(hctx))
+			blk_mq_tag_wakeup_all(hctx->tags, true);
+}
+
 bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
 {
 	return blk_mq_has_free_tags(hctx->tags);