[ 11/17] udl: handle EDID failure properly.

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dave Airlie <airlied@gmail.com>

commit 1baee58638fc58248625255f5c5fcdb987f11b1f upstream.

Don't oops seems proper.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/udl/udl_connector.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/udl/udl_connector.c
+++ b/drivers/gpu/drm/udl/udl_connector.c
@@ -61,6 +61,10 @@ static int udl_get_modes(struct drm_conn
 	int ret;
 
 	edid = (struct edid *)udl_get_edid(udl);
+	if (!edid) {
+		drm_mode_connector_update_edid_property(connector, NULL);
+		return 0;
+	}
 
 	connector->display_info.raw_edid = (char *)edid;