EXTENSION_UNIT 254 sound/usb/usbmixer.c if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT && p[3] == unit) EXTENSION_UNIT 548 sound/usb/usbmixer.c case EXTENSION_UNIT: EXTENSION_UNIT 613 sound/usb/usbmixer.c case EXTENSION_UNIT: EXTENSION_UNIT 1609 sound/usb/usbmixer.c case EXTENSION_UNIT: