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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <OSYP286MB0344A71BA994B77B9E2E46EDBE259@OSYP286MB0344.JPNP286.PROD.OUTLOOK.COM>
Date:   Thu, 13 Oct 2022 22:18:12 +0800
From:   Jinlong Chen <chenjinlong2016@...look.com>
To:     yukuai1@...weicloud.com
Cc:     axboe@...nel.dk, chenjinlong2016@...look.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com
Subject: Re: [PATCH] blk-mq: put the reference of the io scheduler module after switching back

> 
> 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. :)

Sincerely,
Jinlong Chen