linux-kernel - Re: [PATCH] lightnvm: change max_phys

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Message-ID: <CAMuHMdXcF71dGqCSqTCDQgd_7+e+mEg0Qu=50pzzrP3mVY94tA@mail.gmail.com>
Date:	Thu, 12 Nov 2015 19:42:19 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Matias Bjørling <m@...rling.me>
Cc:	linux-block@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...com>
Subject: Re: [PATCH] lightnvm: change max_phys_sect to ushort

On Thu, Nov 12, 2015 at 7:35 PM, Matias Bjørling <m@...rling.me> wrote:
> The max_phys_sect variable is defined as a char. We do a boundary check
> to maximally allow 256 physical page descriptors per command. As we are
> not indexing from zero. This expression is always in false. Bump the
> max_phys_sect to an unsigned short to support the range check.

unsigned int?

>
> Signed-off-by: Matias Bjørling <m@...rling.me>
> Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  include/linux/lightnvm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
> index 69c9057..4b1cd3d 100644
> --- a/include/linux/lightnvm.h
> +++ b/include/linux/lightnvm.h
> @@ -220,7 +220,7 @@ struct nvm_dev_ops {
>         nvm_dev_dma_alloc_fn    *dev_dma_alloc;
>         nvm_dev_dma_free_fn     *dev_dma_free;
>
> -       uint8_t                 max_phys_sect;
> +       unsigned int max_phys_sect;

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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