USB_SERIAL_WRITE_BUSY 162 drivers/usb/serial/generic.c if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) USB_SERIAL_WRITE_BUSY 167 drivers/usb/serial/generic.c clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); USB_SERIAL_WRITE_BUSY 195 drivers/usb/serial/generic.c clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags);