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From:   Kemeng Shi <shikemeng@huaweicloud.com>
To:     hch@lst.de, axboe@kernel.dk, dwagner@suse.de, hare@suse.de,
        ming.lei@redhat.com, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     john.garry@huawei.com, jack@suse.cz
Subject: [PATCH v3 05/14] blk-mq: remove unnecessary list_empty check in blk_mq_try_issue_list_directly
Date:   Wed, 11 Jan 2023 21:01:50 +0800
Message-Id: <20230111130159.3741753-6-shikemeng@huaweicloud.com>
In-Reply-To: <20230111130159.3741753-1-shikemeng@huaweicloud.com>
References: <20230111130159.3741753-1-shikemeng@huaweicloud.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.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 2bfe83f2bcca..ca2be137d6db 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2839,8 +2839,7 @@ 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