diff options
| author | Yu Kuai <yukuai@fnnas.com> | 2026-02-02 16:05:22 +0800 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 07:19:38 -0500 |
| commit | 40932ac2433e824c91fb7232bbcd929c7c93cfd7 (patch) | |
| tree | 1102e4d69e40a2d4a3befd2d055f453275776c3e | |
| parent | d39d675a430308cda49c89e8d64bd80ba350b4c1 (diff) | |
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 <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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | block/blk-mq-debugfs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 4896525b1c05..553d93b88e19 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -686,8 +686,10 @@ 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) |