8139cp: trim ring_info

Fat removal: the mapping address is available from the Rx/Tx descriptors.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

drivers/net/8139cp.c

@@ -316,7 +316,6 @@ struct cp_desc {
 
 struct ring_info {
 	struct sk_buff		*skb;
-	dma_addr_t		mapping;
 	u32			len;
 };
 
@@ -551,7 +550,7 @@ static int cp_rx_poll (struct net_device *dev, int *budget)
 			break;
 
 		len = (status & 0x1fff) - 4;
-		mapping = cp->rx_skb[rx_tail].mapping;
+		mapping = le64_to_cpu(desc->addr);
 
 		if ((status & (FirstFrag | LastFrag)) != (FirstFrag | LastFrag)) {
 			/* we don't support incoming fragmented frames.
@@ -595,10 +594,8 @@ static int cp_rx_poll (struct net_device *dev, int *budget)
 
 		skb_put(skb, len);
 
-		mapping =
-		cp->rx_skb[rx_tail].mapping =
-			pci_map_single(cp->pdev, new_skb->data,
-				       buflen, PCI_DMA_FROMDEVICE);
+		mapping = pci_map_single(cp->pdev, new_skb->data, buflen,
+					 PCI_DMA_FROMDEVICE);
 		cp->rx_skb[rx_tail].skb = new_skb;
 
 		cp_rx_skb(cp, skb, desc);
@@ -717,18 +714,19 @@ static void cp_tx (struct cp_private *cp)
 	unsigned tx_tail = cp->tx_tail;
 
 	while (tx_tail != tx_head) {
+		struct cp_desc *txd = cp->tx_ring + tx_tail;
 		struct sk_buff *skb;
 		u32 status;
 
 		rmb();
-		status = le32_to_cpu(cp->tx_ring[tx_tail].opts1);
+		status = le32_to_cpu(txd->opts1);
 		if (status & DescOwn)
 			break;
 
 		skb = cp->tx_skb[tx_tail].skb;
 		BUG_ON(!skb);
 
-		pci_unmap_single(cp->pdev, cp->tx_skb[tx_tail].mapping,
+		pci_unmap_single(cp->pdev, le64_to_cpu(txd->addr),
 				 cp->tx_skb[tx_tail].len, PCI_DMA_TODEVICE);
 
 		if (status & LastFrag) {
@@ -827,7 +825,6 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
 		wmb();
 
 		cp->tx_skb[entry].skb = skb;
-		cp->tx_skb[entry].mapping = mapping;
 		cp->tx_skb[entry].len = len;
 		entry = NEXT_TX(entry);
 	} else {
@@ -845,7 +842,6 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
 		first_mapping = pci_map_single(cp->pdev, skb->data,
 					       first_len, PCI_DMA_TODEVICE);
 		cp->tx_skb[entry].skb = skb;
-		cp->tx_skb[entry].mapping = first_mapping;
 		cp->tx_skb[entry].len = first_len;
 		entry = NEXT_TX(entry);
 
@@ -888,7 +884,6 @@ static int cp_start_xmit (struct sk_buff *skb, struct net_device *dev)
 			wmb();
 
 			cp->tx_skb[entry].skb = skb;
-			cp->tx_skb[entry].mapping = mapping;
 			cp->tx_skb[entry].len = len;
 			entry = NEXT_TX(entry);
 		}
@@ -1091,6 +1086,7 @@ static int cp_refill_rx (struct cp_private *cp)
 
 	for (i = 0; i < CP_RX_RING_SIZE; i++) {
 		struct sk_buff *skb;
+		dma_addr_t mapping;
 
 		skb = dev_alloc_skb(cp->rx_buf_sz + RX_OFFSET);
 		if (!skb)
@@ -1099,12 +1095,12 @@ static int cp_refill_rx (struct cp_private *cp)
 		skb->dev = cp->dev;
 		skb_reserve(skb, RX_OFFSET);
 
-		cp->rx_skb[i].mapping = pci_map_single(cp->pdev,
-			skb->data, cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+		mapping = pci_map_single(cp->pdev, skb->data, cp->rx_buf_sz,
+					 PCI_DMA_FROMDEVICE);
 		cp->rx_skb[i].skb = skb;
 
 		cp->rx_ring[i].opts2 = 0;
-		cp->rx_ring[i].addr = cpu_to_le64(cp->rx_skb[i].mapping);
+		cp->rx_ring[i].addr = cpu_to_le64(mapping);
 		if (i == (CP_RX_RING_SIZE - 1))
 			cp->rx_ring[i].opts1 =
 				cpu_to_le32(DescOwn | RingEnd | cp->rx_buf_sz);
@@ -1152,11 +1148,13 @@ static int cp_alloc_rings (struct cp_private *cp)
 
 static void cp_clean_rings (struct cp_private *cp)
 {
+	struct cp_desc *desc;
 	unsigned i;
 
 	for (i = 0; i < CP_RX_RING_SIZE; i++) {
 		if (cp->rx_skb[i].skb) {
-			pci_unmap_single(cp->pdev, cp->rx_skb[i].mapping,
+			desc = cp->rx_ring + i;
+			pci_unmap_single(cp->pdev, le64_to_cpu(desc->addr),
 					 cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
 			dev_kfree_skb(cp->rx_skb[i].skb);
 		}
@@ -1166,9 +1164,10 @@ static void cp_clean_rings (struct cp_private *cp)
 		if (cp->tx_skb[i].skb) {
 			struct sk_buff *skb = cp->tx_skb[i].skb;
 
-			pci_unmap_single(cp->pdev, cp->tx_skb[i].mapping,
+			desc = cp->tx_ring + i;
+			pci_unmap_single(cp->pdev, le64_to_cpu(desc->addr),
 				 	 cp->tx_skb[i].len, PCI_DMA_TODEVICE);
-			if (le32_to_cpu(cp->tx_ring[i].opts1) & LastFrag)
+			if (le32_to_cpu(desc->opts1) & LastFrag)
 				dev_kfree_skb(skb);
 			cp->net_stats.tx_dropped++;
 		}