linux-kernel - Re: [PATCH] drm/rockchip: Delete an unnecessary check before drm_gem_object_unreference

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Date:	Tue, 19 Jul 2016 09:59:29 +0800
From:	Mark yao <mark.yao@...k-chips.com>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>,
	David Airlie <airlied@...ux.ie>,
	Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] drm/rockchip: Delete an unnecessary check before
 drm_gem_object_unreference_unlocked()

On 2016年07月15日 21:35, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Fri, 15 Jul 2016 15:23:22 +0200
>
> The drm_gem_object_unreference_unlocked() function tests whether
> its argument is NULL and then returns immediately.
> 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/rockchip/rockchip_drm_fb.c | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> index 20f12bc..6f64e79 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
> @@ -43,14 +43,10 @@ struct drm_gem_object *rockchip_fb_get_gem_obj(struct drm_framebuffer *fb,
>   static void rockchip_drm_fb_destroy(struct drm_framebuffer *fb)
>   {
>   	struct rockchip_drm_fb *rockchip_fb = to_rockchip_fb(fb);
> -	struct drm_gem_object *obj;
>   	int i;
>   
> -	for (i = 0; i < ROCKCHIP_MAX_FB_BUFFER; i++) {
> -		obj = rockchip_fb->obj[i];
> -		if (obj)
> -			drm_gem_object_unreference_unlocked(obj);
> -	}
> +	for (i = 0; i < ROCKCHIP_MAX_FB_BUFFER; i++)
> +		drm_gem_object_unreference_unlocked(rockchip_fb->obj[i]);
>   
Good, Thanks for the fixes, Applied to my drm-fixes.

>   	drm_framebuffer_cleanup(fb);
>   	kfree(rockchip_fb);


-- 
Ｍark Yao