From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Fri, 9 Feb 2018 09:30:44 +0200
Subject: drm/omap: fix omap_fbdev_free() when omap_fbdev_create() wasn't called
Git-commit: e6204a58b9e9ad01ab9c6d4b8b2b8b9c4e38bbba
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

If we have no crtcs/connectors, fbdev init goes fine, but
omap_fbdev_create() is never called. This means that omap_fbdev->bo is
NULL and omap_fbdev_free() crashes.

Add a check to omap_fbdev_free() to handle the NULL case.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/omapdrm/omap_fbdev.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/omapdrm/omap_fbdev.c
+++ b/drivers/gpu/drm/omapdrm/omap_fbdev.c
@@ -303,7 +303,8 @@ void omap_fbdev_free(struct drm_device *
 	fbdev = to_omap_fbdev(priv->fbdev);
 
 	/* unpin the GEM object pinned in omap_fbdev_create() */
-	omap_gem_unpin(fbdev->bo);
+	if (fbdev->bo)
+		omap_gem_unpin(fbdev->bo);
 
 	/* this will free the backing object */
 	if (fbdev->fb)