mdio_driver_unregister
mdio_driver_unregister(&dsa_loop_drv);
mdio_driver_unregister(drv);
EXPORT_SYMBOL(mdio_driver_unregister);
module_driver(_mdio_driver, mdio_driver_register, mdio_driver_unregister)
void mdio_driver_unregister(struct mdio_driver *drv);