linux-kernel - Re: [PATCH 2/2] drm: fb: cma: Fail gracefully on allocation failure

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Message-ID: <20121021085454.GC27665@pengutronix.de>
Date:	Sun, 21 Oct 2012 10:54:54 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Thierry Reding <thierry.reding@...onic-design.de>
Cc:	David Airlie <airlied@...ux.ie>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm: fb: cma: Fail gracefully on allocation failure

On Sat, Oct 20, 2012 at 12:32:47PM +0200, Thierry Reding wrote:
> The drm_gem_cma_create() function never returns NULL but rather an error
> encoded in the return value using the ERR_PTR() macro. Callers therefore
> need to check for errors using the IS_ERR() macro. This change allows
> drivers to handle contiguous DMA allocation failures gracefully.
> 
> Signed-off-by: Thierry Reding <thierry.reding@...onic-design.de>

Acked-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

> ---
>  drivers/gpu/drm/drm_fb_cma_helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
> index d6c80a3..fd9d0af 100644
> --- a/drivers/gpu/drm/drm_fb_cma_helper.c
> +++ b/drivers/gpu/drm/drm_fb_cma_helper.c
> @@ -220,7 +220,7 @@ static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
>  
>  	size = mode_cmd.pitches[0] * mode_cmd.height;
>  	obj = drm_gem_cma_create(dev, size);
> -	if (!obj)
> +	if (IS_ERR(obj))
>  		return -ENOMEM;
>  
>  	fbi = framebuffer_alloc(0, dev->dev);
> -- 
> 1.7.12.4
> 
> 

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