drm/nouveau/dp_mst: Expose a connector to kernel users after it's properly initialized

After a connector is added to the drm_mode_config::connector_list, it's
visible to any in-kernel users looking up connectors via the above list.
Make sure that the connector is properly initialized before such
look-ups, by initializing the connector with
drm_connector_dynamic_init() - which doesn't add the connector to the
list - and registering it with drm_connector_dynamic_register() - which
adds the connector to the list - after the initialization is complete.

v2: Fix s/drm_connector_dynamic_register()/drm_connector_dynamic_init()
    typo in the commit log.

Cc: Karol Herbst <[email protected]>
Cc: Lyude Paul <[email protected]>
Cc: Danilo Krummrich <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Acked-by: Wayne Lin <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: ideak

drivers/gpu/drm/nouveau/dispnv50/disp.c

@@ -1265,8 +1265,8 @@ nv50_mstc_new(struct nv50_mstm *mstm, struct drm_dp_mst_port *port,
 	mstc->mstm = mstm;
 	mstc->port = port;
 
-	ret = drm_connector_init(dev, &mstc->connector, &nv50_mstc,
-				 DRM_MODE_CONNECTOR_DisplayPort);
+	ret = drm_connector_dynamic_init(dev, &mstc->connector, &nv50_mstc,
+					 DRM_MODE_CONNECTOR_DisplayPort, NULL);
 	if (ret) {
 		kfree(*pmstc);
 		*pmstc = NULL;