From: Yu Kuai Date: Mon, 2 Feb 2026 08:05:22 +0000 (+0800) Subject: blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs() X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9d20fd6ce1ba9733cd5ac96fcab32faa9fc404dd;p=thirdparty%2Fkernel%2Flinux.git 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 Reviewed-by: Nilay Shroff Reviewed-by: Ming Lei Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe --- diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 22c182b40bc3f..5c7cadf51a88f 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -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)