if (ioread32 (np->base + TxListPtr) == 0)
iowrite32 (np->tx_ring_dma + head * sizeof(struct netdev_desc),
np->base + TxListPtr);
if (ioread32 (np->base + TxListPtr) == 0)
iowrite32 (np->tx_ring_dma + head * sizeof(struct netdev_desc),
np->base + TxListPtr);