__tty_port_tty_hangup
EXPORT_SYMBOL_GPL(__tty_port_tty_hangup);
void __tty_port_tty_hangup(struct tty_port *port, bool check_clocal, bool async);
__tty_port_tty_hangup(port, check_clocal, true);
__tty_port_tty_hangup(port, false, false);