snd_kill_fasync
void snd_kill_fasync(struct snd_fasync *fasync, int signal, int poll);
snd_kill_fasync(ctl->fasync, SIGIO, POLL_IN);
snd_kill_fasync(ctl->fasync, SIGIO, POLL_ERR);
EXPORT_SYMBOL_GPL(snd_kill_fasync);
snd_kill_fasync(runtime->fasync, SIGIO, POLL_IN);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);