From fdf63ace6a655f772a46e73719de14f9dd6fb940 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 8 Aug 2016 08:26:58 -0400
Subject: [PATCH] add explanatory comment

---
 libs/ardour/port_manager.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libs/ardour/port_manager.cc b/libs/ardour/port_manager.cc
index ec8e3024ea..10c19a9c67 100644
--- a/libs/ardour/port_manager.cc
+++ b/libs/ardour/port_manager.cc
@@ -353,6 +353,12 @@ PortManager::register_output_port (DataType type, const string& portname, bool a
 int
 PortManager::unregister_port (boost::shared_ptr<Port> port)
 {
+	/* This is a little subtle. We do not call the backend's port
+	 * unregistration code from here. That is left for the Port
+	 * destructor. We are trying to drop references to the Port object
+	 * here, so that its destructor will run and it will unregister itself.
+	 */
+
 	/* caller must hold process lock */
 
 	{