linux-kernel - Re: [PATCH] drm: remove redundant assignment to variable 'ret'

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Date:   Wed, 15 Jul 2020 14:05:03 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Jing Xiangfeng <jingxiangfeng@...wei.com>
Cc:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        ajax@...hat.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: remove redundant assignment to variable 'ret'

On Wed, Jul 15, 2020 at 03:05:59PM +0800, Jing Xiangfeng wrote:
> The variable ret has been assigned the value '-EINVAL'. The assignment
> in the if() is redundant. We can remove it.

Nope, that's not correct. Before this assignement ret is guaranteed to be
0.
-Daniel

> 
> Signed-off-by: Jing Xiangfeng <jingxiangfeng@...wei.com>
> ---
>  drivers/gpu/drm/drm_auth.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
> index 800ac39f3213..6e1b502f2797 100644
> --- a/drivers/gpu/drm/drm_auth.c
> +++ b/drivers/gpu/drm/drm_auth.c
> @@ -299,7 +299,6 @@ int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
>  
>  	if (file_priv->master->lessor != NULL) {
>  		DRM_DEBUG_LEASE("Attempt to drop lessee %d as master\n", file_priv->master->lessee_id);
> -		ret = -EINVAL;
>  		goto out_unlock;
>  	}
>  
> -- 
> 2.17.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch