rt2x00usb_register_write_lock
.register_write_lock = rt2x00usb_register_write_lock,
rt2x00usb_register_write_lock(rt2x00dev, PHY_CSR4, reg);
rt2x00usb_register_write_lock(rt2x00dev, PHY_CSR3, reg);
rt2x00usb_register_write_lock(rt2x00dev, PHY_CSR3, reg);