[ALSA] check for linked substreams of different cards

It is possible to have linked substreams that belong to different cards
and/or different drivers.  This patch changes some drivers to make sure
that they do not incorrectly try to handle substreams of a different
card.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c
index 611fc15a0545..c7f79be98d04 100644
--- a/sound/pci/ca0106/ca0106_main.c
+++ b/sound/pci/ca0106/ca0106_main.c
@@ -853,6 +853,9 @@ static int snd_ca0106_pcm_trigger_playback(struct snd_pcm_substream *substream,
                 break;
         }
         snd_pcm_group_for_each_entry(s, substream) {
+                if (snd_pcm_substream_chip(s) != emu ||
+                    s->stream != SNDRV_PCM_STREAM_PLAYBACK)
+                        continue;
                 runtime = s->runtime;
                 epcm = runtime->private_data;
                 channel = epcm->channel_id;