 spin_unlock_irqrestore(&port->lock, flags);  
static unsigned int sunzilog_tx_empty(struct uart_port *port){	unsigned char status;	unsigned int ret;	status = sunzilog_read_channel_status(port);	if (status & Tx_BUF_EMP)		ret = TIOCSER_TEMT;	else		ret = 0;	return ret;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/c5f4644e6c8ba21666128603e4e92544d3cd740d/sunzilog.c/clean/drivers/serial/sunzilog.c