spin_lock_irqsave(&port->ip_lock, flags); transmit_chars(the_port); spin_unlock_irqrestore(&port->ip_lock, flags);
set_notification(port, N_OUTPUT_LOWAT, 1); enable_intrs(port, port->ip_hooks->intr_tx_mt);
static void ic4_start_tx(struct uart_port *the_port){	struct ioc4_port *port = get_ioc4_port(the_port);	unsigned long flags;	if (port) {		spin_lock_irqsave(&port->ip_lock, flags);		transmit_chars(the_port);		spin_unlock_irqrestore(&port->ip_lock, flags);	}}