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blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs()

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In blk_mq_update_nr_hw_queues(), debugfs_mutex is not held while
creating debugfs entries for hctxs. Hence add debugfs_mutex there,
it's safe because queue is not frozen.

Signed-off-by: Yu Kuai <yukuai@fnnas.com>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yu Kuai 2026-02-02 16:05:22 +08:00 • committed by Jens Axboe
parent 5ae4b12ee6
commit 9d20fd6ce1
1 changed files with 2 additions and 0 deletions
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2
block/blk-mq-debugfs.c
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@ -679,8 +679,10 @@ void blk_mq_debugfs_register_hctxs(struct request_queue *q)
struct blk_mq_hw_ctx *hctx;
unsigned long i;
mutex_lock(&q->debugfs_mutex);
queue_for_each_hw_ctx(q, hctx, i)
blk_mq_debugfs_register_hctx(q, hctx);
mutex_unlock(&q->debugfs_mutex);
}
void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)