From 89024f6f1216c9fa5afe9c831d4204a184594c05 Mon Sep 17 00:00:00 2001
From: Arun Raghavan <arun.raghavan@collabora.co.uk>
Date: Mon, 16 Jul 2012 15:50:10 +0530
Subject: [PATCH] alsa: Allow channel count probe on open by mapping

This allows opening a PCM given a mapping to work even if we don't have
a channel count for the device up-front.
---
 src/modules/alsa/alsa-util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c
index fbdf4760..bb4e307c 100644
--- a/src/modules/alsa/alsa-util.c
+++ b/src/modules/alsa/alsa-util.c
@@ -627,7 +627,7 @@ snd_pcm_t *pa_alsa_open_by_device_id_mapping(
             tsched_size,
             use_mmap,
             use_tsched,
-            TRUE);
+            pa_channel_map_valid(&m->channel_map) /* Query the channel count if we don't know what we want */);
 
     if (!pcm_handle)
         return NULL;
-- 
2.39.2