[v3,4/4] drm/edid: Make sure the CEA mode arrays have the correct amount of modes

[Tom Anderson]

Reviewed-by: Thomas Anderson <thomasanderson at google.com>

On Wed, Sep 25, 2019 at 04:55:02PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> We depend on a specific relationship between the VIC number and the
> index in the CEA mode arrays. Assert that the arrays have the excpected
> size to make sure we've not accidentally left holes in them.
> 
> v2: Pimp the BUILD_BUG_ON()s
> 
> Cc: Hans Verkuil <hansverk at cisco.com>
> Cc: Shashank Sharma <shashank.sharma at intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Reviewed-by: Manasi Navare <manasi.d.navare at intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 0007004d3221..06cac8e2afc2 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -3209,6 +3209,9 @@ static u8 *drm_find_cea_extension(const struct edid *edid)
>  
>  static const struct drm_display_mode *cea_mode_for_vic(u8 vic)
>  {
> +	BUILD_BUG_ON(1 + ARRAY_SIZE(edid_cea_modes_1) - 1 != 127);
> +	BUILD_BUG_ON(193 + ARRAY_SIZE(edid_cea_modes_193) - 1 != 219);
> +
>  	if (vic >= 1 && vic < 1 + ARRAY_SIZE(edid_cea_modes_1))
>  		return &edid_cea_modes_1[vic - 1];
>  	if (vic >= 193 && vic < 193 + ARRAY_SIZE(edid_cea_modes_193))