[PATCH v5 05/12] blk-mq: extract one helper function polling hw queue

[Jeffle Xu <jefflexu@linux.alibaba.com>]

Extract the logic of polling one hw queue and related statistics
handling out as the helper function.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
 block/blk-mq.c         |  5 +----
 include/linux/blk-mq.h | 13 +++++++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 214fa30b460a..6ef9f0b038c2 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3876,11 +3876,8 @@ int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, bool spin)
 	do {
 		int ret;
 
-		hctx->poll_invoked++;
-
-		ret = q->mq_ops->poll(hctx);
+		ret = blk_mq_poll_hctx(q, hctx);
 		if (ret > 0) {
-			hctx->poll_success++;
 			__set_current_state(TASK_RUNNING);
 			return ret;
 		}
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 6a7b693b9917..b406cab347d6 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -614,6 +614,19 @@ static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
 		rq->rq_disk = bio->bi_bdev->bd_disk;
 }
 
+static inline int blk_mq_poll_hctx(struct request_queue *q,
+				   struct blk_mq_hw_ctx *hctx)
+{
+	int ret;
+
+	hctx->poll_invoked++;
+	ret = q->mq_ops->poll(hctx);
+	if (ret > 0)
+		hctx->poll_success++;
+
+	return ret;
+}
+
 blk_qc_t blk_mq_submit_bio(struct bio *bio);
 int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
 void blk_mq_hctx_set_fq_lock_class(struct blk_mq_hw_ctx *hctx,
-- 
2.27.0