linux-kernel - Re: [dm-devel] [PATCH -next v2 2/6] md: refactor action

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Date:   Tue, 13 Jun 2023 20:25:59 +0800
From:   Xiao Ni <xni@...hat.com>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     guoqing.jiang@...ux.dev, agk@...hat.com, snitzer@...nel.org,
        dm-devel@...hat.com, song@...nel.org, yi.zhang@...wei.com,
        yangerkun@...wei.com, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [dm-devel] [PATCH -next v2 2/6] md: refactor action_store() for
 'idle' and 'frozen'

On Tue, Jun 13, 2023 at 8:00 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> Hi,
>
> 在 2023/06/13 16:02, Xiao Ni 写道:
> >
> > 在 2023/5/29 下午9:20, Yu Kuai 写道:
> >> From: Yu Kuai <yukuai3@...wei.com>
> >>
> >> Prepare to handle 'idle' and 'frozen' differently to fix a deadlock,
> >> there
> >> are no functional changes except that MD_RECOVERY_RUNNING is checked
> >> again after 'reconfig_mutex' is held.
> >
> >
> > Can you explain more about why it needs to check MD_RECOVERY_RUNNING
> > again here?
>
> As I explain in the following comment:

Hi

Who can clear the flag before the lock is held?

Regards
Xiao
> >> +    /*
> >> +     * Check again in case MD_RECOVERY_RUNNING is cleared before lock is
> >> +     * held.
> >> +     */
> >> +    if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) {
> >> +        mddev_unlock(mddev);
> >> +        return;
> >> +    }
>
> Thanks,
> Kuai
>