linux-kernel - Re: [PATCH 05/10] rnbd: add error handling support for add

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Date:   Thu, 2 Sep 2021 07:32:44 +0200
From:   Jinpu Wang <jinpu.wang@...os.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Liu Shixin <liushixin2@...wei.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Lee Jones <lee.jones@...aro.org>,
        Geoff Levand <geoff@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        benh@...nel.crashing.org, paulus@...ba.org, jim@...n.com,
        Haris Iqbal <haris.iqbal@...os.com>, josh.h.morris@...ibm.com,
        pjk1939@...ux.ibm.com, Tim Waugh <tim@...erelk.net>,
        Richard Weinberger <richard@....at>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        linux-block <linux-block@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/10] rnbd: add error handling support for add_disk()

On Wed, Sep 1, 2021 at 11:01 PM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
looks good to me.
Acked-by: Jack Wang <jinpu.wang@...os.com>
> ---
>  drivers/block/rnbd/rnbd-clt.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/block/rnbd/rnbd-clt.c b/drivers/block/rnbd/rnbd-clt.c
> index bd4a41afbbfc..1ba1c868535a 100644
> --- a/drivers/block/rnbd/rnbd-clt.c
> +++ b/drivers/block/rnbd/rnbd-clt.c
> @@ -1384,8 +1384,10 @@ static void setup_request_queue(struct rnbd_clt_dev *dev)
>         blk_queue_write_cache(dev->queue, dev->wc, dev->fua);
>  }
>
> -static void rnbd_clt_setup_gen_disk(struct rnbd_clt_dev *dev, int idx)
> +static int rnbd_clt_setup_gen_disk(struct rnbd_clt_dev *dev, int idx)
>  {
> +       int err;
> +
>         dev->gd->major          = rnbd_client_major;
>         dev->gd->first_minor    = idx << RNBD_PART_BITS;
>         dev->gd->minors         = 1 << RNBD_PART_BITS;
> @@ -1410,7 +1412,11 @@ static void rnbd_clt_setup_gen_disk(struct rnbd_clt_dev *dev, int idx)
>
>         if (!dev->rotational)
>                 blk_queue_flag_set(QUEUE_FLAG_NONROT, dev->queue);
> -       add_disk(dev->gd);
> +       err = add_disk(dev->gd);
> +       if (err)
> +               blk_cleanup_disk(dev->gd);
> +
> +       return err;
>  }
>
>  static int rnbd_client_setup_device(struct rnbd_clt_dev *dev)
> @@ -1426,8 +1432,7 @@ static int rnbd_client_setup_device(struct rnbd_clt_dev *dev)
>         rnbd_init_mq_hw_queues(dev);
>
>         setup_request_queue(dev);
> -       rnbd_clt_setup_gen_disk(dev, idx);
> -       return 0;
> +       return rnbd_clt_setup_gen_disk(dev, idx);
>  }
>
>  static struct rnbd_clt_dev *init_dev(struct rnbd_clt_session *sess,
> --
> 2.30.2
>