From 1bee17d3b9cb8effbe59518742b06dff3bc1a4f8 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 26 Feb 2016 14:51:06 +0100
Subject: [PATCH] prevent livelock on NaN, inf control parameters - fixes #6789

|: Gtk::Adjustment::value_changed  AutomationControl::set_value Controllable::Changed
GUI Event Loop  Gtk::Adjustment::set_value :|

TODO: check portability of `isfinite ()`
---
 libs/ardour/automation_control.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/ardour/automation_control.cc b/libs/ardour/automation_control.cc
index 583f38807d..7e9b55976c 100644
--- a/libs/ardour/automation_control.cc
+++ b/libs/ardour/automation_control.cc
@@ -199,6 +199,9 @@ AutomationControl::internal_to_interface (double val) const
 double
 AutomationControl::interface_to_internal (double val) const
 {
+	if (!isfinite (val)) {
+		val = 0;
+	}
 	if (_desc.logarithmic) {
 		if (val <= 0) {
 			val = 0;