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int drm_mode_dirtyfb_ioctl(struct drm_device *dev,

			   void *data, struct drm_file *file_priv)

{

	struct drm_clip_rect __user *clips_ptr;

	struct drm_clip_rect *clips = NULL;

	struct drm_mode_fb_dirty_cmd *r = data;

	struct drm_mode_object *obj;

	struct drm_framebuffer *fb;

	unsigned flags;

	int num_clips;

	int ret = 0;

	mutex_lock(&dev->mode_config.mutex);

	obj = drm_mode_object_find(dev, r->fb_id, DRM_MODE_OBJECT_FB);

	if (!obj) {

		DRM_ERROR("invalid framebuffer id\n");

		ret = -EINVAL;

		goto out_err1;

	}

	fb = obj_to_fb(obj);

	num_clips = r->num_clips;

	clips_ptr = (struct drm_clip_rect *)(unsigned long)r->clips_ptr;

	if (!num_clips != !clips_ptr) {

		ret = -EINVAL;

		goto out_err1;

	}

	flags = DRM_MODE_FB_DIRTY_FLAGS & r->flags;

	/* If userspace annotates copy, clips must come in pairs */

	if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY && (num_clips % 2)) {

		ret = -EINVAL;

		goto out_err1;

	}

	if (num_clips && clips_ptr) {

		clips = kzalloc(num_clips * sizeof(*clips), GFP_KERNEL);

		if (!clips) {

			ret = -ENOMEM;

			goto out_err1;

		}

		ret = copy_from_user(clips, clips_ptr,

				     num_clips * sizeof(*clips));

		if (ret)

			goto out_err2;

	}

	if (fb->funcs->dirty) {

		ret = fb->funcs->dirty(fb, flags, r->color, clips, num_clips);

	} else {

		ret = -ENOSYS;

		goto out_err2;

	}

out_err2:

	kfree(clips);

out_err1:

	mutex_unlock(&dev->mode_config.mutex);

	return ret;

}