tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs()

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>

authored by

Yu Kuai and committed by
Jens Axboe 9d20fd6c 5ae4b12e

+2
+2
block/blk-mq-debugfs.c
··· 679 679 struct blk_mq_hw_ctx *hctx; 680 680 unsigned long i; 681 681 682 + mutex_lock(&q->debugfs_mutex); 682 683 queue_for_each_hw_ctx(q, hctx, i) 683 684 blk_mq_debugfs_register_hctx(q, hctx); 685 + mutex_unlock(&q->debugfs_mutex); 684 686 } 685 687 686 688 void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)