[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, 2 insertions, 0 deletions

diff --git a/sound/pci/pcxhr/pcxhr.c b/sound/pci/pcxhr/pcxhr.c
index f7f6a687f033..1b787f455576 100644
--- a/sound/pci/pcxhr/pcxhr.c
+++ b/sound/pci/pcxhr/pcxhr.c
@@ -646,6 +646,8 @@ static int pcxhr_trigger(struct snd_pcm_substream *subs, int cmd)
                 if (snd_pcm_stream_linked(subs)) {
                         struct snd_pcxhr *chip = snd_pcm_substream_chip(subs);
                         snd_pcm_group_for_each_entry(s, subs) {
+                                if (snd_pcm_substream_chip(s) != chip)
+                                        continue;
                                 stream = s->runtime->private_data;
                                 stream->status =
                                         PCXHR_STREAM_STATUS_SCHEDULE_RUN;