From 95215ff405bf4c2bd5a8600c79a96c87b905683a Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Sun, 13 Jun 2021 07:59:14 -0600
Subject: [PATCH] JACK backend: avoid deadlock if a port is unregistered that
 is not known to Ardour

---
 libs/backends/jack/jack_portengine.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libs/backends/jack/jack_portengine.cc b/libs/backends/jack/jack_portengine.cc
index aa3c46ed0c..bc78aa95b9 100644
--- a/libs/backends/jack/jack_portengine.cc
+++ b/libs/backends/jack/jack_portengine.cc
@@ -258,6 +258,8 @@ JACKAudioBackend::jack_registration_callback (jack_port_id_t id, int reg)
 		if (!reg) {
 			if (ports->erase (name)) {
 				_jack_ports.update (ports);
+			} else {
+				_jack_ports.no_update();
 			}
 		} else {
 			if (ports->find (name) != ports->end()) {