linux-kernel - [PATCH 3/4] blk-mq: delete superfluous check in iterate callback

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Date:   Mon, 21 Aug 2023 15:35:27 +0800
From:   chengming.zhou@...ux.dev
To:     axboe@...nel.dk, ming.lei@...hat.com, hch@....de,
        bvanassche@....org
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhouchengming@...edance.com
Subject: [PATCH 3/4] blk-mq: delete superfluous check in iterate callback

From: Chengming Zhou <zhouchengming@...edance.com>

The blk_mq_queue_tag_busy_iter() already has BT_TAG_ITER_STARTED flag
filter set, only started requests will be iterated over.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/blk-mq.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index f14b8669ac69..0b03963e0854 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1496,19 +1496,15 @@ EXPORT_SYMBOL(blk_mq_delay_kick_requeue_list);
 
 static bool blk_mq_rq_inflight(struct request *rq, void *priv)
 {
+	bool *busy = priv;
+
 	/*
 	 * If we find a request that isn't idle we know the queue is busy
 	 * as it's checked in the iter.
 	 * Return false to stop the iteration.
 	 */
-	if (blk_mq_request_started(rq)) {
-		bool *busy = priv;
-
-		*busy = true;
-		return false;
-	}
-
-	return true;
+	*busy = true;
+	return false;
 }
 
 bool blk_mq_queue_inflight(struct request_queue *q)
-- 
2.41.0