snd_usb_pcm_close 1988 sound/usb/usbaudio.c 	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_PLAYBACK);
snd_usb_pcm_close 1998 sound/usb/usbaudio.c 	return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);