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

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Message-ID: <20251116041024.120500-1-yukuai@fnnas.com>
Date: Sun, 16 Nov 2025 12:10:19 +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 RESEND 0/5] block/blk-rq-qos: fix incorrect lock order for rq_qos_mutex and freeze queue

 - Resend with kernel.org email server.

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