drm/i915: properly check for MODESET for kms driver ioctls

Also ditch the cargo-culted dev_priv checks - either we have a
giant hole in our setup code or this is useless. Plainly bogus
to check for it in either case.

v2: Chris Wilson noticed that I've missed one bogus dev_priv check.

v3: The check in the overlay code is redundant (Chris)
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -6189,15 +6189,12 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
 int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
 				struct drm_file *file)
 {
-	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct drm_i915_get_pipe_from_crtc_id *pipe_from_crtc_id = data;
 	struct drm_mode_object *drmmode_obj;
 	struct intel_crtc *crtc;
 
-	if (!dev_priv) {
-		DRM_ERROR("called with no initialization\n");
-		return -EINVAL;
-	}
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -ENODEV;
 
 	drmmode_obj = drm_mode_object_find(dev, pipe_from_crtc_id->crtc_id,
 			DRM_MODE_OBJECT_CRTC);

drivers/gpu/drm/i915/intel_overlay.c

@@ -1122,11 +1122,7 @@ int intel_overlay_put_image(struct drm_device *dev, void *data,
 	struct put_image_params *params;
 	int ret;
 
-	if (!dev_priv) {
-		DRM_ERROR("called with no initialization\n");
-		return -EINVAL;
-	}
-
+	/* No need to check for DRIVER_MODESET - we don't set it up then. */
 	overlay = dev_priv->overlay;
 	if (!overlay) {
 		DRM_DEBUG("userspace bug: no overlay\n");
@@ -1323,11 +1319,7 @@ int intel_overlay_attrs(struct drm_device *dev, void *data,
 	struct overlay_registers __iomem *regs;
 	int ret;
 
-	if (!dev_priv) {
-		DRM_ERROR("called with no initialization\n");
-		return -EINVAL;
-	}
-
+	/* No need to check for DRIVER_MODESET - we don't set it up then. */
 	overlay = dev_priv->overlay;
 	if (!overlay) {
 		DRM_DEBUG("userspace bug: no overlay\n");

drivers/gpu/drm/i915/intel_sprite.c

@@ -558,14 +558,13 @@ int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
 			      struct drm_file *file_priv)
 {
 	struct drm_intel_sprite_colorkey *set = data;
-	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_mode_object *obj;
 	struct drm_plane *plane;
 	struct intel_plane *intel_plane;
 	int ret = 0;
 
-	if (!dev_priv)
-		return -EINVAL;
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -ENODEV;
 
 	/* Make sure we don't try to enable both src & dest simultaneously */
 	if ((set->flags & (I915_SET_COLORKEY_DESTINATION | I915_SET_COLORKEY_SOURCE)) == (I915_SET_COLORKEY_DESTINATION | I915_SET_COLORKEY_SOURCE))
@@ -592,14 +591,13 @@ int intel_sprite_get_colorkey(struct drm_device *dev, void *data,
 			      struct drm_file *file_priv)
 {
 	struct drm_intel_sprite_colorkey *get = data;
-	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_mode_object *obj;
 	struct drm_plane *plane;
 	struct intel_plane *intel_plane;
 	int ret = 0;
 
-	if (!dev_priv)
-		return -EINVAL;
+	if (!drm_core_check_feature(dev, DRIVER_MODESET))
+		return -ENODEV;
 
 	mutex_lock(&dev->mode_config.mutex);