linux-kernel - [PATCH v2 0/1] nvme: Convert tag_list mutex to rwsemaphore to avoid deadlock

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Message-ID: <20251117202414.4071380-1-mkhalfella@purestorage.com>
Date: Mon, 17 Nov 2025 12:23:52 -0800
From: Mohamed Khalfella <mkhalfella@...estorage.com>
To: Jens Axboe <axboe@...nel.dk>,
	Keith Busch <kbusch@...nel.org>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>
Cc: Casey Chen <cachen@...estorage.com>,
	Vikas Manocha <vmanocha@...estorage.com>,
	Yuanyuan Zhong <yzhong@...estorage.com>,
	Hannes Reinecke <hare@...e.de>,
	Ming Lei <ming.lei@...hat.com>,
	linux-nvme@...ts.infradead.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mohamed Khalfella <mkhalfella@...estorage.com>
Subject: [PATCH v2 0/1] nvme: Convert tag_list mutex to rwsemaphore to avoid deadlock

Changes from v1:

- Keep existing behavior do not freeze newly added "q" when
  transitioning tagset from unshared to shared.
- Delete blk_mq_update_tag_set_shared() and explicitly freeze "firstq"
  and "q" and set their shared status.
- Add comment explaining why we are downgrading the semaphore before
  freezing "firstq".

v1: https://lore.kernel.org/all/20251113202320.2530531-1-mkhalfella@purestorage.com/

Mohamed Khalfella (1):
  nvme: Convert tag_list mutex to rwsemaphore to avoid deadlock

 block/blk-mq-sysfs.c   | 10 ++---
 block/blk-mq.c         | 95 +++++++++++++++++++++++-------------------
 include/linux/blk-mq.h |  4 +-
 3 files changed, 58 insertions(+), 51 deletions(-)

-- 
2.51.0