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blk-mq: Make blk_mq_quiesce_tagset() hold the tag list mutex less long 

commit ccd9e252c515ac5a3ed04a414c95d1307d17f159 upstream.

Make sure that the tag_list_lock mutex is not held any longer than
necessary. This change reduces latency if e.g. blk_mq_quiesce_tagset()
is called concurrently from more than one thread. This function is used
by the NVMe core and also by the UFS driver.

Reported-by: Peter Wang <peter.wang@mediatek.com>
Cc: Chao Leng <lengchao@huawei.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 414dd48e88 ("blk-mq: add tagset quiesce interface")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/r/20241022181617.2716173-1-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bart Van Assche 2024-10-22 11:16:17 -07:00 committed by Greg Kroah-Hartman
parent e95080fba1
commit 68a69ed52a
1 changed files with 2 additions and 1 deletions
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3
block/blk-mq.c
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@ -283,8 +283,9 @@ void blk_mq_quiesce_tagset(struct blk_mq_tag_set *set)
if (!blk_queue_skip_tagset_quiesce(q))
blk_mq_quiesce_queue_nowait(q);
}
blk_mq_wait_quiesce_done(set);
mutex_unlock(&set->tag_list_lock);
blk_mq_wait_quiesce_done(set);
}
EXPORT_SYMBOL_GPL(blk_mq_quiesce_tagset);