$NetBSD: patch-aw,v 1.4 2009/12/09 10:13:03 drochner Exp $

--- src/post/audio/upmix.c.orig	2009-11-30 21:55:58.000000000 +0100
+++ src/post/audio/upmix.c
@@ -396,6 +396,8 @@ static post_plugin_t *upmix_open_plugin(
 
   _x_post_init(&this->post, 1, 0);
 
+  pthread_mutex_init(&this->lock, 0);
+
   this->params.cut_off_freq = 100;
 
   port = _x_post_intercept_audio_port(&this->post, audio_target[0], &input, &output);
