usb_serial_generic_write_start
EXPORT_SYMBOL_GPL(usb_serial_generic_write_start);
result = usb_serial_generic_write_start(port, GFP_ATOMIC);
usb_serial_generic_write_start(port, GFP_ATOMIC);
r = usb_serial_generic_write_start(port, GFP_NOIO);
r = usb_serial_generic_write_start(port, GFP_NOIO);
int usb_serial_generic_write_start(struct usb_serial_port *port, gfp_t mem_flags);