greybus: svc: clean up link configuration hack at hello

Commit ee2f2074fd ("greybus: svc: reconfig APBridgeA-Switch link to
handle required load") added a temporary hack which reconfigures the
link at HELLO by abusing the deferred request processing mechanism.

Restructure the HELLO request processing so that the link-configuration
work is queued before creating the debugfs files and add a comment
explaining why it's there.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20220202113347.1288-4-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/greybus/svc.c

@@ -864,16 +864,19 @@ static int gb_svc_hello(struct gb_operation *op)
 		goto err_deregister_svc;
 	}
 
-	gb_svc_debugfs_init(svc);
-
+	/*
+	 * FIXME: This is a temporary hack to reconfigure the link at HELLO
+	 * (which abuses the deferred request processing mechanism).
+	 */
 	ret = gb_svc_queue_deferred_request(op);
 	if (ret)
-		goto err_remove_debugfs;
+		goto err_destroy_watchdog;
+
+	gb_svc_debugfs_init(svc);
 
 	return 0;
 
-err_remove_debugfs:
-	gb_svc_debugfs_exit(svc);
+err_destroy_watchdog:
 	gb_svc_watchdog_destroy(svc);
 err_deregister_svc:
 	device_del(&svc->dev);