linux-kernel - Re: [PATCH] blk-mq: put the reference of the io scheduler module after switching back

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Message-ID: <b4d2bb3e-ae2d-3028-ca73-f34eabf7bd01@huaweicloud.com>
Date:   Fri, 14 Oct 2022 15:27:29 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Jinlong Chen <chenjinlong2016@...look.com>, yukuai1@...weicloud.com
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] blk-mq: put the reference of the io scheduler module
 after switching back

Hi!

在 2022/10/13 22:18, Jinlong Chen 写道:
>>
>> But I don't see elevator_switch() release the referenct of the module
>> it is switching from. It's still not balance to me.
>>
> 
> The reference count is released here:
> 
> elevator_switch_mq()
>    --> elevator_exit()
>      --> __elevator_exit()
>        --> kobject_put()
>          --> kobject_release()
>            --> elevator_release()
>              --> elevator_put()
> 
> What a deep call stack. :)

Yes, you're right.

Thanks,
Kuai
> 
> Sincerely,
> Jinlong Chen
> .
>