From 0ff3933dade5bbd7cb4a8ddbbd2a951e47a6b668 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 21 Jun 2017 12:54:39 -0400
Subject: [PATCH] drop route shared_ptr when Route::GoingAway is emitted

---
 libs/ardour/ardour/disk_io.h |  1 +
 libs/ardour/disk_io.cc       | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/libs/ardour/ardour/disk_io.h b/libs/ardour/ardour/disk_io.h
index e09f25d767..2224978c36 100644
--- a/libs/ardour/ardour/disk_io.h
+++ b/libs/ardour/ardour/disk_io.h
@@ -58,6 +58,7 @@ class LIBARDOUR_API DiskIOProcessor : public Processor
 	DiskIOProcessor (Session&, const std::string& name, Flag f);
 
 	void set_route (boost::shared_ptr<Route>);
+	void drop_route ();
 
 	static void set_buffering_parameters (BufferingPreset bp);
 
diff --git a/libs/ardour/disk_io.cc b/libs/ardour/disk_io.cc
index 40f97cba0a..26be1e0a0f 100644
--- a/libs/ardour/disk_io.cc
+++ b/libs/ardour/disk_io.cc
@@ -387,10 +387,20 @@ DiskIOProcessor::ChannelInfo::~ChannelInfo ()
 	capture_transition_buf = 0;
 }
 
+void
+DiskIOProcessor::drop_route ()
+{
+	_route.reset ();
+}
+
 void
 DiskIOProcessor::set_route (boost::shared_ptr<Route> r)
 {
 	_route = r;
+
+	if (_route) {
+		_route->DropReferences.connect_same_thread (*this, boost::bind (&DiskIOProcessor::drop_route, this));
+	}
 }
 
 /** Get the start, end, and length of a location "atomically".