linux-kernel - Re: [PATCH v2 01/13] nvdimm/btt: do not call del

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Message-ID: <20211103160243.GA31562@lst.de>
Date:   Wed, 3 Nov 2021 17:02:43 +0100
From:   Christoph Hellwig <hch@....de>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     axboe@...nel.dk, hch@....de, penguin-kernel@...ove.sakura.ne.jp,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, ira.weiny@...el.com, richard@....at,
        miquel.raynal@...tlin.com, vigneshr@...com, efremov@...ux.com,
        song@...nel.org, martin.petersen@...cle.com, hare@...e.de,
        jack@...e.cz, ming.lei@...hat.com, tj@...nel.org,
        linux-mtd@...ts.infradead.org, linux-scsi@...r.kernel.org,
        linux-raid@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/13] nvdimm/btt: do not call del_gendisk() if not
 needed

On Wed, Nov 03, 2021 at 05:21:45AM -0700, Luis Chamberlain wrote:
> del_gendisk() is not required if the disk has not been added.
> On kernels prior to commit 40b3a52ffc5bc3 ("block: add a sanity
> check for a live disk in del_gendisk") it is mandatory to not
> call del_gendisk() if the underlying device has not been through
> device_add().

And even with the sanity check is it wrong, and will trigger a WARN_ON.
So maybe this commit log could use a little update?

With that fixed I think this should go into 5.16 and -stable.

Reviewed-by: Christoph Hellwig <hch@....de>