Re: [PATCH v2] block: genhd: don't call probe function with major_names_lock held

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To: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH v2] block: genhd: don't call probe function with major_names_lock held
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 21 Jun 2021 07:18:48 +0100
Cc: hch@xxxxxxxxxxxxx, axboe@xxxxxxxxx, desmondcheongzx@xxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel-mentees@xxxxxxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mtd@xxxxxxxxxxxxxxxxxxx, miquel.raynal@xxxxxxxxxxx, richard@xxxxxx, Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>, syzbot+6a8a0d93c91e8fbf2e80@xxxxxxxxxxxxxxxxxxxxxxxxx, vigneshr@xxxxxx
In-reply-to: <f790f8fb-5758-ea4e-a527-0ee4af82dd44@i-love.sakura.ne.jp>
References: <f790f8fb-5758-ea4e-a527-0ee4af82dd44@i-love.sakura.ne.jp>

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.

References:
- [PATCH v2] block: genhd: don't call probe function with major_names_lock held
  - From: Tetsuo Handa

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