[PATCH 1/6] drm: Reject replacing property enum values

[Daniel Vetter]

On Tue, Mar 06, 2018 at 06:48:44PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> If the property already has the enum value WARN and bail.
> Replacing enum values doesn't make sense to me.
> 
> Throw out the pointless list_empty() while at it.
> 
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Suggested-by: Daniel Vetter <daniel at ffwll.ch>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/drm_property.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
> index c37ac41125b5..d77b0c4dc485 100644
> --- a/drivers/gpu/drm/drm_property.c
> +++ b/drivers/gpu/drm/drm_property.c
> @@ -390,14 +390,9 @@ int drm_property_add_enum(struct drm_property *property, int index,
>  			(value > 63))
>  		return -EINVAL;
>  
> -	if (!list_empty(&property->enum_list)) {
> -		list_for_each_entry(prop_enum, &property->enum_list, head) {
> -			if (prop_enum->value == value) {
> -				strncpy(prop_enum->name, name, DRM_PROP_NAME_LEN);
> -				prop_enum->name[DRM_PROP_NAME_LEN-1] = '\0';
> -				return 0;
> -			}
> -		}
> +	list_for_each_entry(prop_enum, &property->enum_list, head) {
> +		if (WARN_ON(prop_enum->value == value))
> +			return -EINVAL;
>  	}
>  
>  	prop_enum = kzalloc(sizeof(struct drm_property_enum), GFP_KERNEL);
> -- 
> 2.16.1
> 

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