usb_wwan_write_room 2052 drivers/usb/serial/option.c 	.write_room        = usb_wwan_write_room,
usb_wwan_write_room  462 drivers/usb/serial/qcserial.c 	.write_room	     = usb_wwan_write_room,
usb_wwan_write_room   14 drivers/usb/serial/usb-wwan.h extern int usb_wwan_write_room(struct tty_struct *tty);
usb_wwan_write_room  345 drivers/usb/serial/usb_wwan.c EXPORT_SYMBOL(usb_wwan_write_room);