linux-kernel - Re: [Linux-fbdev-devel] [PATCH 14/15] amifb: check fb_alloc_cmap return value and handle failure properly

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Message-ID: <20090209165131.4c625d4c@ephemeral>
Date:	Mon, 9 Feb 2009 16:51:31 -0500
From:	Andres Salomon <dilinger@...ued.net>
To:	Krzysztof Helt <krzysztof.h1@...pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, adaplas@...il.com
Subject: Re: [Linux-fbdev-devel] [PATCH 14/15] amifb: check fb_alloc_cmap
 return value and handle failure properly

On Mon, 9 Feb 2009 21:26:29 +0100
Krzysztof Helt <krzysztof.h1@...pl> wrote:

> On Sat, 7 Feb 2009 12:18:57 -0500
> Andres Salomon <dilinger@...ued.net> wrote:
> 
> > 
> > Signed-off-by: Andres Salomon <dilinger@...ian.org>
> > ---
> 
> Acked-by: Krzysztof Helt <krzysztof.h1@...pl>
> 
> One comment below.
[...]
> > @@ -2456,7 +2458,8 @@ amifb_error:
> >  
> >  static void amifb_deinit(void)
> >  {
> > -	fb_dealloc_cmap(&fb_info.cmap);
> > +	if (fb_info.cmap.len)
> > +		fb_dealloc_cmap(&fb_info.cmap);
> 
> Again, is the "if(fb_info.cmap.len)" needed here?

Yep; amifb_deinit is called from amifb_init in the case of errors.
This can happen before fb_alloc_cmap is called (but after the memory
region has been requested), so we need to explicitly check that cmap
memory has been allocated.


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