linux-kernel - Re: [PATCH 04/13] nvdimm/btt: use goto error labels on btt_blk

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Date:   Sun, 31 Oct 2021 10:51:08 -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 04/13] nvdimm/btt: use goto error labels on btt_blk_init()

On Fri, Oct 15, 2021 at 4:53 PM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> This will make it easier to share common error paths.
>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  drivers/nvdimm/btt.c | 19 ++++++++++++-------
>  1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
> index 29cc7325e890..23ee8c005db5 100644
> --- a/drivers/nvdimm/btt.c
> +++ b/drivers/nvdimm/btt.c
> @@ -1520,10 +1520,11 @@ static int btt_blk_init(struct btt *btt)
>  {
>         struct nd_btt *nd_btt = btt->nd_btt;
>         struct nd_namespace_common *ndns = nd_btt->ndns;
> +       int rc = -ENOMEM;
>
>         btt->btt_disk = blk_alloc_disk(NUMA_NO_NODE);
>         if (!btt->btt_disk)
> -               return -ENOMEM;
> +               goto out;

I tend to not use a goto when there is nothing to unwind.

The rest looks good to me. After dropping "goto out;" you can add:

Reviewed-by: Dan Williams <dan.j.williams@...el.com>