UPF_NO_THRE_TEST  387 drivers/tty/serial/8250/8250_aspeed_vuart.c 		| UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST;
UPF_NO_THRE_TEST 2199 drivers/tty/serial/8250/8250_port.c 	if (port->irq && !(up->port.flags & UPF_NO_THRE_TEST)) {