[PATCH] drm: Skip drm_mode_config_validate() for !modeset

[Chris Wilson]

Quoting Ville Syrjala (2020-03-18 18:25:18)
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> drm_mode_config_init() may not have been called when the driver/device
> doesn't support modeset. That will cause drm_mode_config_validate()
> to oops. Skip the validation for !modeset.
> 
> TODO: We may want to consider calling drm_mode_config_init()
> unconditionally to avoid similar issues elsewhere...
> 
> Fixes: 74d2aacbe840 ("drm: Validate encoder->possible_clones")
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris