linux-kernel - [PATCH v3 2/2] blk-mq: use if-else instead of goto in blk_mq_alloc_cached

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Message-Id: <d3306fa4e92dc9cc614edc8f1802686096bafef2.1667358114.git.nickyc975@zju.edu.cn>
Date:   Wed,  2 Nov 2022 11:06:05 +0800
From:   Jinlong Chen <nickyc975@....edu.cn>
To:     axboe@...nel.dk
Cc:     hch@....de, chaitanyak@...dia.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, nickyc975@....edu.cn
Subject: [PATCH v3 2/2] blk-mq: use if-else instead of goto in blk_mq_alloc_cached_request()

if-else is more readable than goto here.

Signed-off-by: Jinlong Chen <nickyc975@....edu.cn>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 block/blk-mq.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 453ad445a6bd..6ffca7af5b6f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -544,25 +544,26 @@ static struct request *blk_mq_alloc_cached_request(struct request_queue *q,
 
 	if (!plug)
 		return NULL;
+
 	if (rq_list_empty(plug->cached_rq)) {
 		if (plug->nr_ios == 1)
 			return NULL;
 		rq = blk_mq_rq_cache_fill(q, plug, opf, flags);
-		if (rq)
-			goto got_it;
-		return NULL;
-	}
-	rq = rq_list_peek(&plug->cached_rq);
-	if (!rq || rq->q != q)
-		return NULL;
+		if (!rq)
+			return NULL;
+	} else {
+		rq = rq_list_peek(&plug->cached_rq);
+		if (!rq || rq->q != q)
+			return NULL;
 
-	if (blk_mq_get_hctx_type(opf) != rq->mq_hctx->type)
-		return NULL;
-	if (op_is_flush(rq->cmd_flags) != op_is_flush(opf))
-		return NULL;
+		if (blk_mq_get_hctx_type(opf) != rq->mq_hctx->type)
+			return NULL;
+		if (op_is_flush(rq->cmd_flags) != op_is_flush(opf))
+			return NULL;
+
+		plug->cached_rq = rq_list_next(rq);
+	}
 
-	plug->cached_rq = rq_list_next(rq);
-got_it:
 	rq->cmd_flags = opf;
 	INIT_LIST_HEAD(&rq->queuelist);
 	return rq;
-- 
2.31.1