diff --git a/block/blk-mq.c b/block/blk-mq.c
index d383711..24c528f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1380,7 +1380,7 @@
 	plug = current->plug;
 	if (plug) {
 		blk_mq_bio_to_request(rq, bio);
-		if (list_empty(&plug->mq_list))
+		if (!request_count)
 			trace_block_plug(q);
 		else if (request_count >= BLK_MAX_REQUEST_COUNT) {
 			blk_flush_plug_list(plug, false);