linux-kernel - Re: [PATCH 2/2] drm/vmwgfx: Fix uninitialized return in vmw_kms_helper

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Message-ID: <20150918224234.GB18173@syeh-linux>
Date:	Fri, 18 Sep 2015 15:42:50 -0700
From:	"Sinclair Yeh" <syeh@...are.com>
To:	Christian Engelmayer <cengelma@....at>
Cc:	airlied@...ux.ie, thellstrom@...are.com, daniel.vetter@...ll.ch,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/vmwgfx: Fix uninitialized return in
 vmw_kms_helper_dirty()

Reviewed-by: Sinclair Yeh <syeh@...are.com>

On Sat, Sep 19, 2015 at 12:32:24AM +0200, Christian Engelmayer wrote:
> Function vmw_kms_helper_dirty() uses the uninitialized variable ret as
> return value. Make the result deterministic and directly return as the
> variable is unused anyway. Detected by Coverity CID 1324255.
> 
> Signed-off-by: Christian Engelmayer <cengelma@....at>
> ---
> Compile tested only. Applies against linux-next.
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index 61fb7f3de311..15a6c01cd016 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -1685,7 +1685,6 @@ int vmw_kms_helper_dirty(struct vmw_private *dev_priv,
>  	struct drm_crtc *crtc;
>  	u32 num_units = 0;
>  	u32 i, k;
> -	int ret;
>  
>  	dirty->dev_priv = dev_priv;
>  
> @@ -1711,7 +1710,7 @@ int vmw_kms_helper_dirty(struct vmw_private *dev_priv,
>  			if (!dirty->cmd) {
>  				DRM_ERROR("Couldn't reserve fifo space "
>  					  "for dirty blits.\n");
> -				return ret;
> +				return -ENOMEM;
>  			}
>  			memset(dirty->cmd, 0, dirty->fifo_reserve_size);
>  		}
> -- 
> 1.9.1
> 
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