snd_usb_create_mixer 3640 sound/usb/usbaudio.c 		    snd_usb_create_mixer(chip, ifnum, ignore_ctl_error) < 0) {
snd_usb_create_mixer  226 sound/usb/usbaudio.h int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,