linux-kernel - Re: [PATCH v2 04/13] nvdimm/blk: avoid calling del

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Message-ID: <YYK9JtysvnF+xctB@bombadil.infradead.org>
Date:   Wed, 3 Nov 2021 09:47:34 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     axboe@...nel.dk, 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 04/13] nvdimm/blk: avoid calling del_gendisk() on
 early failures

On Wed, Nov 03, 2021 at 05:05:47PM +0100, Christoph Hellwig wrote:
> On Wed, Nov 03, 2021 at 05:21:48AM -0700, Luis Chamberlain wrote:
> > If nd_integrity_init() fails we'd get del_gendisk() called,
> > but that's not correct as we should only call that if we're
> > done with device_add_disk(). Fix this by providing unwinding
> > prior to the devm call being registered and moving the devm
> > registration to the very end.
> > 
> > This should fix calling del_gendisk() if nd_integrity_init()
> > fails. I only spotted this issue through code inspection. It
> > does not fix any real world bug.
> 
> Looks good,
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> 
> Should this grow a Fixes tag for the commit adding the problem?

Given this driver is going to be removed, do we care? The only
reason I re-added the patch was Dan could not remove the driver
on time.

  Luis