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Thu, 04 Dec 2025 10:12:38 -0800 (PST) From: Mohamed Khalfella To: Chaitanya Kulkarni , Christoph Hellwig , Jens Axboe , Keith Busch , Sagi Grimberg Cc: Casey Chen , Yuanyuan Zhong , Hannes Reinecke , Ming Lei , Waiman Long , Hillf Danton , linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Mohamed Khalfella Subject: [PATCH 0/1] Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock Date: Thu, 4 Dec 2025 10:11:52 -0800 Message-ID: <20251204181212.1484066-1-mkhalfella@purestorage.com> X-Mailer: git-send-email 2.51.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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