lan78xx_tx_urb_space
if (tx_pend_data_len > lan78xx_tx_urb_space(dev)) {
tx_pend_data_len, lan78xx_tx_urb_space(dev));
if (lan78xx_tx_pend_data_len(dev) < lan78xx_tx_urb_space(dev))
(lan78xx_tx_pend_data_len(dev) < lan78xx_tx_urb_space(dev)))