DESC_RING_SIZE
if (valid == intf->rx_edpkt_dma_addr + DESC_RING_SIZE)
intf->rx_edpkt_cpu = dma_alloc_coherent(kdev, DESC_RING_SIZE,
intf->tx_spb_cpu = dma_alloc_coherent(kdev, DESC_RING_SIZE,
dma_free_coherent(kdev, DESC_RING_SIZE, intf->tx_spb_cpu,
dma_free_coherent(kdev, DESC_RING_SIZE, intf->rx_edpkt_cpu,
dma_free_coherent(kdev, DESC_RING_SIZE, intf->rx_edpkt_cpu,
dma_free_coherent(kdev, DESC_RING_SIZE, intf->tx_spb_cpu,
intf->rx_edpkt_dma_valid = intf->rx_edpkt_dma_addr + (DESC_RING_SIZE - 1);
intf->tx_spb_dma_valid = intf->tx_spb_dma_addr + DESC_RING_SIZE - 1;