From 648aa7ce0bd81162bd02ab6931bf0e671818b284 Mon Sep 17 00:00:00 2001 From: Yu Kuai Date: Mon, 2 Feb 2026 16:05:22 +0800 Subject: blk-mq-debugfs: add missing debugfs_mutex in blk_mq_debugfs_register_hctxs() [ Upstream commit 9d20fd6ce1ba9733cd5ac96fcab32faa9fc404dd ] 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 Signed-off-by: Sasha Levin --- block/blk-mq-debugfs.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'block') diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index c3b5930106b2..e0677043f00d 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -730,8 +730,10 @@ 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) -- cgit v1.2.3