linux-kernel - [PATCH 0/1] Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list

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Message-ID: <20251204181212.1484066-1-mkhalfella@purestorage.com>
Date: Thu,  4 Dec 2025 10:11:52 -0800
From: Mohamed Khalfella <mkhalfella@...estorage.com>
To: Chaitanya Kulkarni <kch@...dia.com>,
	Christoph Hellwig <hch@....de>,
	Jens Axboe <axboe@...nel.dk>,
	Keith Busch <kbusch@...nel.org>,
	Sagi Grimberg <sagi@...mberg.me>
Cc: Casey Chen <cachen@...estorage.com>,
	Yuanyuan Zhong <yzhong@...estorage.com>,
	Hannes Reinecke <hare@...e.de>,
	Ming Lei <ming.lei@...hat.com>,
	Waiman Long <llong@...hat.com>,
	Hillf Danton <hdanton@...a.com>,
	linux-nvme@...ts.infradead.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mohamed Khalfella <mkhalfella@...estorage.com>
Subject: [PATCH 0/1] Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock

The patch in v2 converted set->tag_list_lock to a rwsemaphore. It was
pointed out this could result in a different kind of deadlock. This
patch uses RCU to protect set->tag_list when accessed from [un]quiesce
code.

v2 - https://lore.kernel.org/all/20251117202414.4071380-1-mkhalfella@purestorage.com/

Mohamed Khalfella (1):
  block: Use RCU in blk_mq_[un]quiesce_tagset() instead of
    set->tag_list_lock

 block/blk-mq.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

-- 
2.51.2