linux-kernel - Re: [PATCH] fbdev: remove unnecessary memset in vfb

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Message-ID: <CAMuHMdW9g4h0EX_gZsXiTfaXsOTtqOqVN+SN=GtV8zNRQo_LXA@mail.gmail.com>
Date:	Thu, 20 Aug 2015 10:21:04 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Marcin Chojnacki <marcinch7@...il.com>
Cc:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fbdev: remove unnecessary memset in vfb

On Thu, Jun 18, 2015 at 3:01 PM, Marcin Chojnacki <marcinch7@...il.com> wrote:
> In vfb_probe memory is allocated using rvmalloc which automatically
> sets the allocated memory to zero. This patch removes the second
> unnecessary memset in vfb_probe.
>
> Signed-off-by: Marcin Chojnacki <marcinch7@...il.com>
> ---
>  drivers/video/fbdev/vfb.c | 8 --------
>  1 file changed, 8 deletions(-)
>
> diff --git a/drivers/video/fbdev/vfb.c b/drivers/video/fbdev/vfb.c
> index 70a897b..b2d38b7 100644
> --- a/drivers/video/fbdev/vfb.c
> +++ b/drivers/video/fbdev/vfb.c
> @@ -490,14 +490,6 @@ static int vfb_probe(struct platform_device *dev)
>         if (!(videomemory = rvmalloc(videomemorysize)))
>                 return retval;
>
> -       /*
> -        * VFB must clear memory to prevent kernel info
> -        * leakage into userspace
> -        * VGA-based drivers MUST NOT clear memory if
> -        * they want to be able to take over vgacon
> -        */
> -       memset(videomemory, 0, videomemorysize);
> -

As vfb also serves as a sample driver, I think it would be worthwhile to move
the comment to rvmalloc().

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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