linux-kernel - Re: WARNING in __init

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Date:   Mon, 18 Oct 2021 10:15:05 +0200
From:   Christoph Hellwig <hch@....de>
To:     Zqiang <qiang.zhang1211@...il.com>
Cc:     Christoph Hellwig <hch@....de>, Hao Sun <sunhao.th@...il.com>,
        Hillf Danton <hdanton@...a.com>, hch@...radead.org,
        willy@...radead.org, Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in __init_work

On Mon, Oct 18, 2021 at 03:21:18PM +0800, Zqiang wrote:
> I find in add_partition(),  if the device_add() return error, we will drop 
> disk object reference count,
>
> but i find put_device(pdev) (will call part_release())and put_disk(disk), 
> both will reduce the reference of the disk object , however we call 
> get_device(disk_to_dev(disk)) only once
>
> or Did I miss something and didn't analyze it？

Yes, this sounds correct.  Do you want to send a patch or should I
prepare one?