usb_audio_extension_unit  200 dev/usb/uaudio.c 		const struct usb_audio_extension_unit *eu;
usb_audio_extension_unit 1273 dev/usb/uaudio.c 	const struct usb_audio_extension_unit *d = iot[id].d.eu;
usb_audio_extension_unit  231 dev/usb/uaudioreg.h struct usb_audio_extension_unit {