[3/4] blk-mq: use if-else instead of goto in blk_mq_alloc_cached_request()

Commit Message

Jinlong Chen Nov. 1, 2022, 3:11 p.m. UTC

if-else is more readable than goto here.

Signed-off-by: Jinlong Chen <[e-mail]>
---
 block/blk-mq.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

Comments

Christoph Hellwig Nov. 1, 2022, 5:35 p.m. UTC | #1

On Tue, Nov 01, 2022 at 11:11:36PM +0800, Jinlong Chen wrote:
> if-else is more readable than goto here.

Looks good:

Reviewed-by: Christoph Hellwig <[e-mail]>

Patch

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 408a929be90e..87a6348a0d0a 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -547,25 +547,26 @@  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;