[FORCEDETH]: Use skb_tailroom where appropriate

Reducing the number of skb->data direct accesses.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 11 deletions

diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index d3f4bcaa9692..7a018027fcc0 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -1388,11 +1388,9 @@ static int nv_alloc_rx(struct net_device *dev)
                         np->put_rx_ctx->skb = skb;
                         np->put_rx_ctx->dma = pci_map_single(np->pci_dev,
                                                              skb->data,
-                                                        (skb_end_pointer(skb) -
-                                                         skb->data),
+                                                             skb_tailroom(skb),
                                                              PCI_DMA_FROMDEVICE);
-                        np->put_rx_ctx->dma_len = (skb_end_pointer(skb) -
-                                                   skb->data);
+                        np->put_rx_ctx->dma_len = skb_tailroom(skb);
                         np->put_rx.orig->buf = cpu_to_le32(np->put_rx_ctx->dma);
                         wmb();
                         np->put_rx.orig->flaglen = cpu_to_le32(np->rx_buf_sz | NV_RX_AVAIL);
@@ -1422,11 +1420,9 @@ static int nv_alloc_rx_optimized(struct net_device *dev)
                         np->put_rx_ctx->skb = skb;
                         np->put_rx_ctx->dma = pci_map_single(np->pci_dev,
                                                              skb->data,
-                                                             (skb_end_pointer(skb) -
-                                                              skb->data),
+                                                             skb_tailroom(skb),
                                                              PCI_DMA_FROMDEVICE);
-                        np->put_rx_ctx->dma_len = (skb_end_pointer(skb) -
-                                                   skb->data);
+                        np->put_rx_ctx->dma_len = skb_tailroom(skb);
                         np->put_rx.ex->bufhigh = cpu_to_le64(np->put_rx_ctx->dma) >> 32;
                         np->put_rx.ex->buflow = cpu_to_le64(np->put_rx_ctx->dma) & 0x0FFFFFFFF;
                         wmb();
@@ -4383,12 +4379,12 @@ static int nv_loopback_test(struct net_device *dev)
                 ret = 0;
                 goto out;
         }
+        test_dma_addr = pci_map_single(np->pci_dev, tx_skb->data,
+                                       skb_tailroom(tx_skb),
+                                       PCI_DMA_FROMDEVICE);
         pkt_data = skb_put(tx_skb, pkt_len);
         for (i = 0; i < pkt_len; i++)
                 pkt_data[i] = (u8)(i & 0xff);
-        test_dma_addr = pci_map_single(np->pci_dev, tx_skb->data,
-                                       (skb_end_pointer(tx_skb) -
-                                        tx_skb->data), PCI_DMA_FROMDEVICE);
 
         if (np->desc_ver == DESC_VER_1 || np->desc_ver == DESC_VER_2) {
                 np->tx_ring.orig[0].buf = cpu_to_le32(test_dma_addr);