diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 9fde174ce396..2957a3763f01 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -831,6 +831,7 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
 	blk_mq_free_tag_set(md->tag_set);
 out_kfree_tag_set:
 	kfree(md->tag_set);
+	md->tag_set = NULL;
 
 	return err;
 }
@@ -840,6 +841,7 @@ void dm_mq_cleanup_mapped_device(struct mapped_device *md)
 	if (md->tag_set) {
 		blk_mq_free_tag_set(md->tag_set);
 		kfree(md->tag_set);
+		md->tag_set = NULL;
 	}
 }