udl: handle EDID failure properly.

Don't oops seems proper.

Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
index fe5cdbc..b44d548 100644 (file)
--- 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_connector *connector)
        int ret;
 
        edid = (struct edid *)udl_get_edid(udl);
+       if (!edid) {
+               drm_mode_connector_update_edid_property(connector, NULL);
+               return 0;
+       }
 
        /*
         * We only read the main block, but if the monitor reports extension