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Message-Id: <3a6d54a5adc8bd09aab28abfbe5f5b02bb863a8d.1667098953.git.nickyc975@zju.edu.cn>
Date: Sun, 30 Oct 2022 11:06:46 +0800
From: Jinlong Chen <nickyc975@....edu.cn>
To: axboe@...nel.dk, kbusch@...nel.org, hch@....de, sagi@...mberg.me
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-nvme@...ts.infradead.org, nickyc975@....edu.cn
Subject: [PATCH v2 1/3] blk-mq: remove redundant call to blk_freeze_queue_start in blk_mq_destroy_queue
The calling relationship in blk_mq_destroy_queue() is as follows:
blk_mq_destroy_queue()
...
-> blk_queue_start_drain()
-> blk_freeze_queue_start() <- called
...
-> blk_freeze_queue()
-> blk_freeze_queue_start() <- called again
-> blk_mq_freeze_queue_wait()
So there is a redundant call to blk_freeze_queue_start(). Replace
blk_freeze_queue() with blk_mq_freeze_queue_wait() to avoid the redundant
call.
Signed-off-by: Jinlong Chen <nickyc975@....edu.cn>
---
block/blk-mq.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4cecf281123f..14c4165511b9 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -4005,7 +4005,12 @@ void blk_mq_destroy_queue(struct request_queue *q)
blk_queue_flag_set(QUEUE_FLAG_DYING, q);
blk_queue_start_drain(q);
- blk_freeze_queue(q);
+
+ /*
+ * blk_freeze_queue_start has been called in blk_queue_start_drain, we just
+ * need to wait.
+ */
+ blk_mq_freeze_queue_wait(q);
blk_sync_queue(q);
blk_mq_cancel_work_sync(q);
--
2.31.1
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