linux-kernel - Re: [PATCH v2 3/3] drm/kms: allocate framebuffer cmap

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Date:	Tue, 3 Nov 2009 17:19:05 +0000 (GMT)
From:	James Simmons <jsimmons@...radead.org>
To:	Clemens Ladisch <clemens@...isch.de>
cc:	Dave Airlie <airlied@...hat.com>, dri-devel@...ts.sourceforge.net,
	linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] drm/kms: allocate framebuffer cmap


> Without an allocated colormap, FBIOGETCMAP fails.  This would make
> programs restore an all-black colormap ("links -g") or fail to work
> altogether ("mplayer -vo fbdev2").
> 
> Signed-off-by: Clemens Ladisch <clemens@...isch.de>
> ---
> v2: implemented suggestions by James Simmons
> 
>  drivers/gpu/drm/drm_fb_helper.c |   4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- linux-2.6/drivers/gpu/drm/drm_fb_helper.c
> +++ linux-2.6/drivers/gpu/drm/drm_fb_helper.c
> @@ -905,6 +905,9 @@ int drm_fb_helper_single_fb_probe(struct
>  
>  	if (new_fb) {
>  		info->var.pixclock = 0;
> +		ret = fb_alloc_cmap(&info->cmap, crtc->gamma_size, 0);
> +		if (ret)
> +			return ret;


>  		if (register_framebuffer(info) < 0) {
			fb_dealloc_cmap(info->cmap);	
>  			return -EINVAL;
		}

Plug memory leak.


>  	} else {
> @@ -936,6 +939,7 @@ void drm_fb_helper_free(struct drm_fb_he
>  		unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
>  	}
>  	drm_fb_helper_crtc_free(helper);
> +	fb_dealloc_cmap(&helper->fb->fbdev->cmap);
>  }
>  EXPORT_SYMBOL(drm_fb_helper_free);
>  
> 
> 
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