linux-kernel - [PATCH v2 05/13] blk-mq: remove unnecessary list_empty check in blk_mq_try_issue_list

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Message-Id: <20230104142259.2673013-6-shikemeng@huaweicloud.com>
Date:   Wed,  4 Jan 2023 22:22:51 +0800
From:   Kemeng Shi <shikemeng@...weicloud.com>
To:     axboe@...nel.dk, dwagner@...e.de, hare@...e.de,
        ming.lei@...hat.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     hch@....de, john.garry@...wei.com, jack@...e.cz
Subject: [PATCH v2 05/13] blk-mq: remove unnecessary list_empty check in blk_mq_try_issue_list_directly

We only break the list walk if we get 'BLK_STS_*RESOURCE'. We also
count errors for 'BLK_STS_*RESOURCE' error. If list is not empty,
errors will always be non-zero. So we can remove unnecessary list_empty
check. This will remove redundant list_empty check for case that
error happened at sending last request in list.

Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
---
 block/blk-mq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9c3a9b5e5b0c..d84ce1f758ce 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2833,8 +2833,7 @@ void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
 	 * the driver there was more coming, but that turned out to
 	 * be a lie.
 	 */
-	if ((!list_empty(list) || errors) &&
-	     hctx->queue->mq_ops->commit_rqs && queued)
+	if (errors && hctx->queue->mq_ops->commit_rqs && queued)
 		hctx->queue->mq_ops->commit_rqs(hctx);
 }
 
-- 
2.30.0