From: Tejun Heo <tj@kernel.org>
To: Yu Kuai <yukuai3@huawei.com>
Cc: axboe@kernel.dk, bo.liu@linux.alibaba.com,
cgroups@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org, yi.zhang@huawei.com
Subject: Re: [PATCH] blk-iolatency: error out if blk_get_queue() failed in iolatency_set_limit()
Date: Thu, 5 Aug 2021 07:17:24 -1000 [thread overview]
Message-ID: <YQwdJJGyfps4LOr2@mtj.duckdns.org> (raw)
In-Reply-To: <20210805124645.543797-1-yukuai3@huawei.com>
On Thu, Aug 05, 2021 at 08:46:45PM +0800, Yu Kuai wrote:
> If queue is dying while iolatency_set_limit() is in progress,
> blk_get_queue() won't increment the refcount of the queue. However,
> blk_put_queue() will still decrement the refcount later, which will
> cause the refcout to be unbalanced.
>
> Thus error out in such case to fix the problem.
>
> Fixes: 8c772a9bfc7c ("blk-iolatency: fix IO hang due to negative inflight counter")
> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Thanks.
--
tejun
next prev parent reply other threads:[~2021-08-05 17:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 12:46 [PATCH] blk-iolatency: error out if blk_get_queue() failed in iolatency_set_limit() Yu Kuai
2021-08-05 17:17 ` Tejun Heo [this message]
2021-08-05 17:18 ` Jens Axboe
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