static void mute_ac97_ctl(struct oxygen *chip, unsigned int control)
 {
-       unsigned int index = chip->controls[control]->private_value & 0xff;
+       unsigned int priv_idx = chip->controls[control]->private_value & 0xff;
        u16 value;
 
-       value = oxygen_read_ac97(chip, 0, index);
+       value = oxygen_read_ac97(chip, 0, priv_idx);
        if (!(value & 0x8000)) {
-               oxygen_write_ac97(chip, 0, index, value | 0x8000);
+               oxygen_write_ac97(chip, 0, priv_idx, value | 0x8000);
                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &chip->controls[control]->id);
        }