drm: WARN_ON if a modeset driver uses legacy suspend/resume helpers

Legacy s/r hooks are only used for shadow-attaching drivers, warn
when a KMS driver tries to use them.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 53d09a1..dc93c88 100644 (file)
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -566,6 +566,8 @@ struct drm_device *drm_dev_alloc(struct drm_driver *driver,
                ret = drm_minor_alloc(dev, DRM_MINOR_CONTROL);
                if (ret)
                        goto err_minors;
+
+               WARN_ON(driver->suspend || driver->resume);
        }
 
        if (drm_core_check_feature(dev, DRIVER_RENDER)) {