From 9a60bb58b2d2a247798d4580b31e41c34ee87807 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 23 Oct 2014 13:02:09 +0200
Subject: [PATCH] skip unavailable backends early on.

---
 libs/ardour/audioengine.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 7c512db625..076700cebf 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -700,11 +700,14 @@ AudioEngine::backend_discover (const string& path)
 		error << Glib::Module::get_last_error() << endmsg;
 		return 0;
 	}
-
-	module.make_resident ();
 	
 	dfunc = (AudioBackendInfo* (*)(void))func;
 	info = dfunc();
+	if (!info->available()) {
+		return 0;
+	}
+
+	module.make_resident ();
 	
 	return info;
 }