linux-kernel - [PATCH 0/5] block/blk-rq-qos: fix incorrect lock order for rq_qos

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Message-Id: <20251116024134.115685-1-yukuai@fnnas.com>
Date: Sun, 16 Nov 2025 10:41:29 +0800
From: "Yu Kuai" <yukuai@...as.com>
To: <axboe@...nel.dk>, <linux-block@...r.kernel.org>, 
	<linux-kernel@...r.kernel.org>, <tj@...nel.org>, <nilay@...ux.ibm.com>, 
	<ming.lei@...hat.com>
Cc: <yukuai@...as.com>
Subject: [PATCH 0/5] block/blk-rq-qos: fix incorrect lock order for rq_qos_mutex and freeze queue

Currently rq_qos_add() will be called with rq_qos_mutex held, and freeze
queue, this is not expected. This set make sure queu is always freezed
before holding rq_qos_mutex.

Yu Kuai (5):
  block/blk-rq-qos: add a new helper rq_qos_add_freezed()
  blk-wbt: fix incorrect lock order for rq_qos_mutex and freeze queue
  blk-iocost: fix incorrect lock order for rq_qos_mutex and freeze queue
  blk-iolatency: fix incorrect lock order for rq_qos_mutex and freeze
    queue
  block/blk-rq-qos: cleanup rq_qos_add()

 block/blk-iocost.c    | 15 +++++++--------
 block/blk-iolatency.c | 11 +++++++----
 block/blk-rq-qos.c    | 23 ++++++-----------------
 block/blk-rq-qos.h    |  4 ++--
 block/blk-wbt.c       |  6 +++++-
 5 files changed, 27 insertions(+), 32 deletions(-)

-- 
2.51.0