linux-kernel - Re: [PATCH] blk: do rq_qos_exit in blk_cleanup

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Message-ID: <96deb063-f4ef-fadd-543b-e905495898f6@kernel.dk>
Date:   Thu, 17 Feb 2022 06:34:02 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Christoph Hellwig <hch@...radead.org>,
        "Wang Jianchao (Kuaishou)" <jianchao.wan9@...il.com>
Cc:     Bart Van Assche <bvanassche@....org>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk: do rq_qos_exit in blk_cleanup_queue

On 2/17/22 12:48 AM, Christoph Hellwig wrote:
> On Wed, Feb 16, 2022 at 07:32:12PM +0800, Wang Jianchao (Kuaishou) wrote:
>> From: Wang Jianchao <wangjianchao@...ishou.com>
>>
>> When __alloc_disk_node() failed, there will not not del_gendisk()
>> any more, then resource in rqos policies is leaked. Add rq_qos_exit()
>> into blk_cleanup_queue(). rqos is removed from the list, so needn't
>> to worry .exit is called twice.
>>
>> Fixes: commit 8e141f9eb803 ("block: drain file system I/O on del_gendisk")
>> Suggested-by: Bart Van Assche <bart.vanassche@....com>
>> Signed-off-by: Wang Jianchao <wangjianchao@...ishou.com>
> 
> Ming had a pending patch to move it into disk_release instead, which
> I think is the right place.

I missed that patch and can't seem to find it, do you have a link?

-- 
Jens Axboe