drm: Show leaked connectors upon unload

After warning that the connector list is not empty on device
unregistration (i.e. module unload) also print out which connectors are
still hanging around to aide finding the leak.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170119090513.4154-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index ed1ee5a44a7ba78b885ea78567ad82ecf23e5c51..884cc4d26fb59e8568abac449252c248e253fdc1 100644 (file)
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -421,7 +421,12 @@ void drm_mode_config_cleanup(struct drm_device *dev)
                drm_connector_unreference(connector);
        }
        drm_connector_list_iter_put(&conn_iter);
-       WARN_ON(!list_empty(&dev->mode_config.connector_list));
+       if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
+               drm_connector_list_iter_get(dev, &conn_iter);
+               drm_for_each_connector_iter(connector, &conn_iter)
+                       DRM_ERROR("connector %s leaked!\n", connector->name);
+               drm_connector_list_iter_put(&conn_iter);
+       }
 
        list_for_each_entry_safe(property, pt, &dev->mode_config.property_list,
                                 head) {