IPHETH_TX_BUF_SIZE
tx_buf = usb_alloc_coherent(iphone->udev, IPHETH_TX_BUF_SIZE,
usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, tx_buf,
usb_free_coherent(iphone->udev, IPHETH_TX_BUF_SIZE, iphone->tx_buf,
if (skb->len > IPHETH_TX_BUF_SIZE) {