linux-kernel - Re: [PATCH 1/1] DRM-UDL: Deletion of an unnecessary check before the function call "vunmap"

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Date:	Thu, 20 Nov 2014 05:17:50 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	David Airlie <airlied@...ux.ie>,
	<dri-devel@...ts.freedesktop.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	<kernel-janitors@...r.kernel.org>,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 1/1] DRM-UDL: Deletion of an unnecessary check before the function call "vunmap"

On November 19, 2014 5:42:26 PM SF Markus Elfring 
<elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Wed, 19 Nov 2014 17:33:32 +0100
>
> The vunmap() function performes also input parameter validation. Thus the test
> around the call is not needed.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/gpu/drm/udl/udl_gem.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/udl/udl_gem.c b/drivers/gpu/drm/udl/udl_gem.c
> index 8044f5f..2979625 100644
> --- a/drivers/gpu/drm/udl/udl_gem.c
> +++ b/drivers/gpu/drm/udl/udl_gem.c
> @@ -164,8 +164,7 @@ void udl_gem_vunmap(struct udl_gem_object *obj)
>  		return;
>  	}
>
> -	if (obj->vmapping)
> -		vunmap(obj->vmapping);
> +	vunmap(obj->vmapping);
>
>  	udl_gem_put_pages(obj);
>  }

Reviewed-by: Thierry Reding <thierry.reding@...il.com>


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