snd_power_ref_and_wait
int snd_power_ref_and_wait(struct snd_card *card);
result = snd_power_ref_and_wait(card);
result = snd_power_ref_and_wait(card);
result = snd_power_ref_and_wait(card);
err = snd_power_ref_and_wait(card);
err = snd_power_ref_and_wait(card);
err = snd_power_ref_and_wait(card);
err = snd_power_ref_and_wait(card);
err = snd_power_ref_and_wait(card);
err = snd_power_ref_and_wait(card);
EXPORT_SYMBOL_GPL(snd_power_ref_and_wait);
ret = snd_power_ref_and_wait(card);