linux-kernel - Re: [PATCH 06/13] nvdimm/blk: avoid calling del

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Message-ID: <CAPcyv4j+xLT=5RUodHWgnPjNq6t5OcmX1oM2zK2ML0U+OS_16Q@mail.gmail.com>
Date:   Fri, 15 Oct 2021 17:13:48 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Geoff Levand <geoff@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, Jim Paris <jim@...n.com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>, senozhatsky@...omium.org,
        Richard Weinberger <richard@....at>, miquel.raynal@...tlin.com,
        vigneshr@...com, Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>, linux-block@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-mtd@...ts.infradead.org,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        linux-nvme@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/13] nvdimm/blk: avoid calling del_gendisk() on early failures

On Fri, Oct 15, 2021 at 4:53 PM Luis Chamberlain <mcgrof@...nel.org> 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.
>

Just fyi, I'm preparing patches to delete this driver completely as it
is unused by any shipping platform. I hope to get that removal into
v5.16.