if (level != RESUME_ENABLE) return 0;
static int serial8250_resume(struct device *dev, u32 level){	int i;	if (level != RESUME_ENABLE)		return 0;	for (i = 0; i < UART_NR; i++) {		struct uart_8250_port *up = &serial8250_ports[i];		if (up->port.type != PORT_UNKNOWN && up->port.dev == dev)			uart_resume_port(&serial8250_reg, &up->port);	}	return 0;}