linux-kernel - Re: [PATCH 3/8] block/floppy.c: handle blk_register

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Date:	Mon, 9 Nov 2015 15:44:26 -0800
From:	Grant Grundler <grundler@...omium.org>
To:	Vishnu Pratap Singh <vishnu.ps@...sung.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeff Moyer <jmoyer@...hat.com>, minchan@...nel.org,
	ngupta@...are.org, sergey.senozhatsky.work@...il.com,
	David Miller <davem@...emloft.net>, neilb@...e.com,
	Ulf Hansson <ulf.hansson@...aro.org>, tiwai@...e.de,
	Hannes Reinecke <hare@...e.de>,
	Ming Lei <ming.lei@...onical.com>, jarod@...hat.com,
	viro@...iv.linux.org.uk, Tejun Heo <tj@...nel.org>,
	adrian.hunter@...el.com, Jon Hunter <jonathanh@...dia.com>,
	Grant Grundler <grundler@...omium.org>,
	Linux IDE mailing list <linux-ide@...r.kernel.org>,
	linux-raid@...r.kernel.org,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	CPGS <cpgs@...sung.com>, vishu13285@...il.com,
	pintu.k@...sung.com, rohit.kr@...sung.com
Subject: Re: [PATCH 3/8] block/floppy.c: handle blk_register_region() return value

On Fri, Nov 6, 2015 at 4:22 AM, Vishnu Pratap Singh
<vishnu.ps@...sung.com> wrote:
> This patch handles blk_register_region() return value.
> Earlier blk_register_region() function doesn't handle error
> cases, now it is added, so the callers of this function
> should also handle it.
>
> Verfied on X86 based ubuntu machine.
> This patch depends on [PATCH 1/8] block/genhd.c: Add error handling
>
> Signed-off-by: Vishnu Pratap Singh <vishnu.ps@...sung.com>
> ---
>  drivers/block/floppy.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
> index 331363e..50802a6 100644
> --- a/drivers/block/floppy.c
> +++ b/drivers/block/floppy.c
> @@ -4219,8 +4219,10 @@ static int __init do_floppy_init(void)
>         if (err)
>                 goto out_unreg_blkdev;
>
> -       blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
> +       err = blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
>                             floppy_find, NULL, NULL);
> +       if (err)
> +               goto out_unreg_region;
>
>         for (i = 0; i < 256; i++)
>                 if (ITYPE(i))
> @@ -4250,7 +4252,7 @@ static int __init do_floppy_init(void)
>         if (fdc_state[0].address == -1) {
>                 cancel_delayed_work(&fd_timeout);
>                 err = -ENODEV;
> -               goto out_unreg_region;
> +               goto out_fdc_err;
>         }
>  #if N_FDC > 1
>         fdc_state[1].address = FDC2;
> @@ -4261,7 +4263,7 @@ static int __init do_floppy_init(void)
>         if (err) {
>                 cancel_delayed_work(&fd_timeout);
>                 err = -EBUSY;
> -               goto out_unreg_region;
> +               goto out_fdc_region;

Please drop this hunk.

>         }
>
>         /* initialise drive state */
> @@ -4357,8 +4359,9 @@ out_remove_drives:
>  out_release_dma:
>         if (atomic_read(&usage_count))
>                 floppy_release_irq_and_dma();
> -out_unreg_region:
> +out_fdc_err:
>         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
> +out_unreg_region:

Nit: out_unreg_region should continue to be a label for the
unregister_region call.

My preference would be to add a new label here so something like
"goto out_driver_unregister" works.

I normally would ignore this sort of thing but this patch needs to be
reposted as V2 anyway.

cheers,
grant

>         platform_driver_unregister(&floppy_driver);
>  out_unreg_blkdev:
>         unregister_blkdev(FLOPPY_MAJOR, "fd");
> --
> 1.9.1
>
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