From: Christoph Hellwig <hch@lst.de>
To: Yu Kuai <yukuai@fnnas.com>
Cc: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me,
sven@kernel.org, j@jannau.net, linux-block@vger.kernel.org,
linux-nvme@lists.infradead.org, tj@kernel.org,
nilay@linux.ibm.com, ming.lei@redhat.com, neal@gompa.dev,
asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/4] nvme-tcp: move blk_mq_update_nr_hw_queues after nvme_unfreeze
Date: Mon, 9 Feb 2026 15:57:41 +0100 [thread overview]
Message-ID: <20260209145741.GB18315@lst.de> (raw)
In-Reply-To: <20260209082953.3053721-3-yukuai@fnnas.com>
On Mon, Feb 09, 2026 at 04:29:51PM +0800, Yu Kuai wrote:
> blk_mq_update_nr_hw_queues() freezes and unfreezes queues internally.
> When the queue is already frozen before this call, the freeze depth
> becomes 2. The internal unfreeze only decrements it to 1, leaving the
> queue still frozen when debugfs_create_files() is called.
>
> This triggers WARN_ON_ONCE(q->mq_freeze_depth != 0) in
> debugfs_create_files() and risks deadlock.
>
> Fix this by moving nvme_unfreeze() before blk_mq_update_nr_hw_queues()
> so the queue is unfrozen before the call, allowing the internal
> freeze/unfreeze to work correctly.
Same comment as for rdma, otherwise:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2026-02-09 14:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-09 8:29 [PATCH 0/4] blk-mq/nvme: fix debugfs creation with frozen queue Yu Kuai
2026-02-09 8:29 ` [PATCH 1/4] nvme-rdma: move blk_mq_update_nr_hw_queues after nvme_unfreeze Yu Kuai
2026-02-09 14:57 ` Christoph Hellwig
2026-02-11 7:21 ` Nilay Shroff
2026-02-09 8:29 ` [PATCH 2/4] nvme-tcp: " Yu Kuai
2026-02-09 14:57 ` Christoph Hellwig [this message]
2026-02-11 7:22 ` Nilay Shroff
2026-02-09 8:29 ` [PATCH 3/4] nvme-apple: " Yu Kuai
2026-02-09 14:58 ` Christoph Hellwig
2026-02-09 15:35 ` Keith Busch
2026-02-10 6:47 ` Yu Kuai
2026-02-10 15:09 ` Keith Busch
2026-02-10 15:41 ` Christoph Hellwig
2026-02-10 16:01 ` Keith Busch
2026-02-10 16:28 ` Daniel Wagner
2026-02-11 1:57 ` Yu Kuai
2026-02-11 12:57 ` Keith Busch
2026-02-10 8:10 ` Nilay Shroff
2026-02-10 15:12 ` Keith Busch
2026-02-11 7:23 ` Nilay Shroff
2026-02-09 8:29 ` [PATCH 4/4] blk-mq: use blk_queue_enter/exit to protect debugfs file creation Yu Kuai
2026-02-09 14:59 ` Christoph Hellwig
2026-02-09 16:40 ` Bart Van Assche
2026-02-09 17:33 ` Keith Busch
2026-02-09 17:51 ` Bart Van Assche
2026-02-10 6:59 ` Yu Kuai
2026-02-10 15:41 ` Christoph Hellwig
2026-02-11 7:20 ` Nilay Shroff
2026-02-11 8:06 ` Yu Kuai
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