QWZ_TX_COMPL_NEXT
while ((QWZ_TX_COMPL_NEXT(tx_ring->tx_status_head) !=
QWZ_TX_COMPL_NEXT(tx_ring->tx_status_head);
(QWZ_TX_COMPL_NEXT(tx_ring->tx_status_head) ==
while (QWZ_TX_COMPL_NEXT(tx_ring->tx_status_tail) !=
QWZ_TX_COMPL_NEXT(tx_ring->tx_status_tail);