diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4f79a9808fd1..7d87e893999b 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -101,16 +101,6 @@ static bool blk_mq_check_inflight(struct request *rq, void *priv)
 	return true;
 }
 
-unsigned int blk_mq_in_flight(struct request_queue *q,
-		struct block_device *part)
-{
-	struct mq_inflight mi = { .part = part };
-
-	blk_mq_queue_tag_busy_iter(q, blk_mq_check_inflight, &mi);
-
-	return mi.inflight[0] + mi.inflight[1];
-}
-
 void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part,
 		unsigned int inflight[2])
 {
diff --git a/block/blk-mq.h b/block/blk-mq.h
index d15ff1e130c8..eeac0d47c878 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -246,8 +246,6 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
 	return hctx->nr_ctx && hctx->tags;
 }
 
-unsigned int blk_mq_in_flight(struct request_queue *q,
-		struct block_device *part);
 void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part,
 		unsigned int inflight[2]);