[PATCH 1/2] drm: make sure visible is set to false if fb is null

[Gustavo Padovan]

From: Gustavo Padovan <gustavo.padovan at collabora.co.uk>

We can't let visible set true while the fb is null, some places of
the code only check for visible to base its decisions.

Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
---
 drivers/gpu/drm/drm_plane_helper.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
index 827ec1a..fe4d1fb 100644
--- a/drivers/gpu/drm/drm_plane_helper.c
+++ b/drivers/gpu/drm/drm_plane_helper.c
@@ -127,6 +127,11 @@ int drm_plane_helper_check_update(struct drm_plane *plane,
 		return -ERANGE;
 	}
 
+	if (!fb) {
+		*visible = false;
+		return 0;
+	}
+
 	*visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
 	if (!*visible)
 		/*
-- 
1.9.3