static void pcm_release_private(struct snd_pcm_substream *substream)
{
	if (snd_pcm_stream_linked(substream))
		snd_pcm_unlink(substream);
}
static void pcm_release_private(struct snd_pcm_substream *substream)
{
	if (snd_pcm_stream_linked(substream))
		snd_pcm_unlink(substream);
}