PACKET_EMPTY
case PACKET_EMPTY:
desc->stat = PACKET_EMPTY; /* Free descriptor */
desc->stat != PACKET_EMPTY) {
desc->stat = PACKET_EMPTY; /* Free descriptor */
if (desc->stat != PACKET_EMPTY) {
if (get_status(port)->tx_descs[port->tx_out].stat != PACKET_EMPTY) {
get_status(port)->tx_descs[i].stat = PACKET_EMPTY;
if (desc->stat != PACKET_EMPTY) {
desc->stat = PACKET_EMPTY;