[ALSA] usb audio suspend support

This patch implements suspend/resume support for USB audio devices.
It works with the microphone in my camera.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 1 insertions, 0 deletions

diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index 2272f45a1867..7cf18c38dc42 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -126,6 +126,7 @@ struct snd_usb_audio {
         u32 usb_id;
         int shutdown;
         int num_interfaces;
+        int num_suspended_intf;
 
         struct list_head pcm_list;      /* list of pcm streams */
         int pcm_devs;