@@ -150,6 +150,15 @@ int drm_mode_getresources(struct drm_device *dev, void *data,
drm_connector_list_iter_begin(dev, &conn_iter);
count = 0;
connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
+ /*
+ * FIXME: the connectors on the list may not be fully initialized yet,
+ * if the ioctl is called before the connectors are registered. (See
+ * drm_dev_register()->drm_modeset_register_all() for static and
+ * drm_connector_dynamic_register() for dynamic connectors.)
+ * The driver should only get registered after static connectors are
+ * fully initialized and dynamic connectors should be added to the
+ * connector list only after fully initializing them.
+ */
drm_for_each_connector_iter(connector, &conn_iter) {
/* only expose writeback connectors if userspace understands them */
if (!file_priv->writeback_connectors &&
The connectors enumerated by the GETRESOURCES ioctl may not be fully initialized yet wrt. to the state set up during connector registration (for instance the connector's debugfs/sysfs interfaces may not exist yet). This can happen in two ways: 1. Connectors initialized and added to the drm_mode_config::connector_list during driver loading will be visible to the GETRESOURCES ioctl caller once the driver is registered via drm_dev_register()->drm_minor_register(DRM_MINOR_PRIMARY) and before the connectors are registered via drm_dev_register()-> drm_modeset_register_all(). 2. Dynamic connectors (MST) - after being initialized - may be added to the connector_list after the driver is loaded and registered and before the connector's userspace interfaces (debugfs, sysfs etc.) are added in drm_connector_dynamic_register(). A solution for 1. would be to register the driver only after the connectors are registered, for 2. to add the connector to connector_list only after the userspace interfaces are registered. The fix would require a bigger change, not the topic of this patchset, so adding only a FIXME comment here. Suggested-by: Simona Vetter <simona.vetter@ffwll.ch> Signed-off-by: Imre Deak <imre.deak@intel.com> --- drivers/gpu/drm/drm_mode_config.c | 9 +++++++++ 1 file changed, 9 insertions(+)