diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 24b48a2f7fbadc8266773cba95f2890df7d60189..87bb146c7d44beef12248b7c6fb9561ebc17045c 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -515,6 +515,13 @@ EXPORT_SYMBOL(blk_mq_tagset_wait_completed_request);
 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
 		void *priv)
 {
+	/*
+	 * For dm, it can run here after register_disk, but the queue has not
+	 * been initialized yet. Check QUEUE_FLAG_REGISTERED prevent null point
+	 * access.
+	 */
+	if (!blk_queue_registered(q))
+		return;
 	/*
 	 * __blk_mq_update_nr_hw_queues() updates nr_hw_queues and queue_hw_ctx
 	 * while the queue is frozen. So we can use q_usage_counter to avoid