From 9a1076256deef8bf806942eb72eabdbfdf74ddb3 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 1 Oct 2013 16:33:07 +0200
Subject: [PATCH] mixer/alsa: handle ENODEV

Fixes busy loop when USB sound device gets unplugged (Mantis bug
#3824).
---
 NEWS                          | 2 ++
 src/mixer/alsa_mixer_plugin.c | 5 +++++
 2 files changed, 7 insertions(+)

diff --git a/NEWS b/NEWS
index 1b74287fc..d59b6ae7f 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.17.6 (not yet released)
+* mixer:
+  - alsa: fix busy loop when USB sound device gets unplugged
 
 ver 0.17.5 (2013/08/04)
 * protocol:
diff --git a/src/mixer/alsa_mixer_plugin.c b/src/mixer/alsa_mixer_plugin.c
index cecf44db9..0c8625cc1 100644
--- a/src/mixer/alsa_mixer_plugin.c
+++ b/src/mixer/alsa_mixer_plugin.c
@@ -182,6 +182,11 @@ alsa_mixer_source_dispatch(GSource *_source,
 	if (err < 0) {
 		g_warning("snd_mixer_handle_events() failed: %s",
 			  snd_strerror(err));
+
+		if (err == -ENODEV)
+			/* the sound device was unplugged; disable
+			   this GSource */
+			return false;
 	}
 
 	return true;