Commit 9d20fd6c authored by Yu Kuai's avatar Yu Kuai Committed by Jens Axboe
Browse files

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: default avatarYu Kuai <yukuai@fnnas.com>
Reviewed-by: default avatarNilay Shroff <nilay@linux.ibm.com>
Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5ae4b12e

block/blk-mq-debugfs.c

+2 −0
Original line number Diff line number Diff line
@@ -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)