UPF_DEAD         1788 drivers/tty/serial/serial_core.c 	if (!uport || uport->flags & UPF_DEAD)
UPF_DEAD         2872 drivers/tty/serial/serial_core.c 	uport->flags &= ~UPF_DEAD;
UPF_DEAD         2917 drivers/tty/serial/serial_core.c 	uport->flags |= UPF_DEAD;