pcm: multi plugin - fix wait_for_avail_min

All slaves should be asked to wait otherwise the write loop might
be interrupted and zero frames might be returned.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/src/pcm/pcm_multi.c b/src/pcm/pcm_multi.c
index 28440378f7e0ae94bea504fb907b1888f97e15f3..0afd31bf5980dcf128fbbe8e3cfa4543b78c6444 100644 (file)
--- a/src/pcm/pcm_multi.c
+++ b/src/pcm/pcm_multi.c
@@ -775,11 +775,15 @@ static int snd_pcm_multi_mmap(snd_pcm_t *pcm)
        return 0;
 }
 
-static int snd_pcm_multi_may_wait_for_avail_min(snd_pcm_t *pcm, snd_pcm_uframes_t avail ATTRIBUTE_UNUSED)
+static int snd_pcm_multi_may_wait_for_avail_min(snd_pcm_t *pcm, snd_pcm_uframes_t avail)
 {
        snd_pcm_multi_t *multi = pcm->private_data;
-       snd_pcm_t *slave = multi->slaves[multi->master_slave].pcm;
-       return snd_pcm_may_wait_for_avail_min(slave, snd_pcm_mmap_avail(slave));
+       unsigned int i;
+       for (i = 0; i < multi->slaves_count; ++i) {
+               if (snd_pcm_may_wait_for_avail_min(multi->slaves[i].pcm, avail))
+                       return 1;
+       }
+       return 0;
 }
 
 static snd_pcm_chmap_query_t **snd_pcm_multi_query_chmaps(snd_pcm_t *pcm)