linux-kernel - [PATCH 2/3] blk-mq: delete redundant tagset map update when fallback

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Date:   Mon, 21 Aug 2023 17:56:01 +0800
From:   chengming.zhou@...ux.dev
To:     axboe@...nel.dk, hch@....de, ming.lei@...hat.com,
        bvanassche@....org
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhouchengming@...edance.com
Subject: [PATCH 2/3] blk-mq: delete redundant tagset map update when fallback

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

When we increase nr_hw_queues fail, the fallback path will use
blk_mq_update_queue_map() to clear and update all maps.
Obviously, this line of update of HCTX_TYPE_DEFAULT only is not
needed, so delete it.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/blk-mq.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 8af29a3b1400..8d02bafff331 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -4737,7 +4737,6 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
 				__blk_mq_free_map_and_rqs(set, i);
 
 			set->nr_hw_queues = prev_nr_hw_queues;
-			blk_mq_map_queues(&set->map[HCTX_TYPE_DEFAULT]);
 			goto fallback;
 		}
 		blk_mq_map_swqueue(q);
-- 
2.41.0