linux-kernel - Re: [PATCH v2] block: genhd: don't call probe function with major_names

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Message-ID: <YNAvSJHMuveUp1o/@infradead.org>
Date:   Mon, 21 Jun 2021 07:18:48 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     hch@...radead.org, axboe@...nel.dk, desmondcheongzx@...il.com,
        gregkh@...uxfoundation.org, linux-block@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        miquel.raynal@...tlin.com, richard@....at,
        Shuah Khan <skhan@...uxfoundation.org>,
        syzbot+6a8a0d93c91e8fbf2e80@...kaller.appspotmail.com,
        vigneshr@...com
Subject: Re: [PATCH v2] block: genhd: don't call probe function with
 major_names_lock held

The obvious fix is to not call unregister_blkdev under loop_ctl_mutex.
Which is pretty pointless anyway - I have a series to fix that but it
might need some reordering to move this to the front.