linux-kernel - Re: [PATCH -mm] fb: modedb uses wrong default

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Date:	Wed, 15 Nov 2006 15:29:52 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Tero Roponen <teanropo@....fi>
Cc:	linux-kernel@...r.kernel.org,
	Jordan Crouse <jordan.crouse@....com>,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: [PATCH -mm] fb: modedb uses wrong default_mode

On Wed, 15 Nov 2006 19:43:16 +0200 (EET)
Tero Roponen <teanropo@....fi> wrote:

> 
> It seems that default_mode is always overwritten in
> fb_find_mode() if caller gives its own modedb; this
> patch should fix it.
> 
> dmesg diff before and after the following patch:
> 
>  neofb: mapped framebuffer at c4a80000
>  -Mode (640x400) won't display properly on LCD
>  -Mode (640x400) won't display properly on LCD
>  -neofb v0.4.2: 2048kB VRAM, using 640x480, 31.469kHz, 59Hz
>  -Console: switching to colour frame buffer device 80x30
>  +neofb v0.4.2: 2048kB VRAM, using 800x600, 37.878kHz, 60Hz
>  +Console: switching to colour frame buffer device 100x37
>   fb0: MagicGraph 128XD frame buffer device
> 
> Signed-off-by: Tero Roponen <teanropo@....fi>
> ---
> 
> --- linux-2.6.19-rc5-mm2/drivers/video/modedb.c.orig	2006-11-15 19:03:03.000000000 +0200
> +++ linux-2.6.19-rc5-mm2/drivers/video/modedb.c	2006-11-15 19:02:57.000000000 +0200
> @@ -507,7 +507,7 @@ int fb_find_mode(struct fb_var_screeninf
>      }
>      if (!default_mode && db != modedb)
>  	default_mode = &db[0];
> -    else
> +    else if (!default_mode)
>  	default_mode = &modedb[DEFAULT_MODEDB_INDEX];
>  
>      if (!default_bpp)

Sigh.

2.6.19-rc5 has:

    if (!default_mode)
	default_mode = &modedb[DEFAULT_MODEDB_INDEX];

and Jordan changed it to

    if (!default_mode && db != modedb)
	default_mode = &db[0];
    else
	default_mode = &modedb[DEFAULT_MODEDB_INDEX];

and you want to change it to

    if (!default_mode && db != modedb)
	default_mode = &db[0];
    else if (!default_mode)
	default_mode = &modedb[DEFAULT_MODEDB_INDEX];

which is actually a complicated way of doing

    if (!default_mode)
	default_mode = &db[DEFAULT_MODEDB_INDEX];

So let's do that.
-
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