[NET]: Remove gratuitous use of skb->tail in network drivers.

Many drivers use skb->tail unnecessarily.

In these situations, the code roughly looks like:

	dev = dev_alloc_skb(...);

	[optional] skb_reserve(skb, ...);

	... skb->tail ...

But even if the skb_reserve() happens, skb->data equals
skb->tail.  So it doesn't make any sense to use anything
other than skb->data in these cases.

Another case was the s2io.c driver directly mucking with
the skb->data and skb->tail pointers.  It really just wanted
to do an skb_reserve(), so that's what the code was changed
to do instead.

Another reason I'm making this change as it allows some SKB
cleanups I have planned simpler to merge.  In those cleanups,
skb->head, skb->tail, and skb->end pointers are removed, and
replaced with skb->head_room and skb->tail_room integers.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Jeff Garzik <jgarzik@pobox.com>

31 files changed, 95 insertions, 97 deletions

diff --git a/drivers/net/3c515.c b/drivers/net/3c515.c
index d272ea36a578..91d1c4c24d9b 100644
--- a/drivers/net/3c515.c
+++ b/drivers/net/3c515.c
@@ -822,7 +822,7 @@ static int corkscrew_open(struct net_device *dev)
                                 break;  /* Bad news!  */
                         skb->dev = dev; /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
-                        vp->rx_ring[i].addr = isa_virt_to_bus(skb->tail);
+                        vp->rx_ring[i].addr = isa_virt_to_bus(skb->data);
                 }
                 vp->rx_ring[i - 1].next = isa_virt_to_bus(&vp->rx_ring[0]);     /* Wrap the ring. */
                 outl(isa_virt_to_bus(&vp->rx_ring[0]), ioaddr + UpListPtr);
@@ -1406,7 +1406,7 @@ static int boomerang_rx(struct net_device *dev)
                                 break;  /* Bad news!  */
                         skb->dev = dev; /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
-                        vp->rx_ring[entry].addr = isa_virt_to_bus(skb->tail);
+                        vp->rx_ring[entry].addr = isa_virt_to_bus(skb->data);
                         vp->rx_skbuff[entry] = skb;
                 }
                 vp->rx_ring[entry].status = 0;  /* Clear complete bit. */
diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index 80ec9aa575bb..07746b95fd83 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -1802,7 +1802,7 @@ vortex_open(struct net_device *dev)
                                 break;                  /* Bad news!  */
                         skb->dev = dev;                 /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
-                        vp->rx_ring[i].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->tail, PKT_BUF_SZ, PCI_DMA_FROMDEVICE));
+                        vp->rx_ring[i].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->data, PKT_BUF_SZ, PCI_DMA_FROMDEVICE));
                 }
                 if (i != RX_RING_SIZE) {
                         int j;
@@ -2632,7 +2632,7 @@ boomerang_rx(struct net_device *dev)
                                 pci_dma_sync_single_for_cpu(VORTEX_PCI(vp), dma, PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
                                 /* 'skb_put()' points to the start of sk_buff data area. */
                                 memcpy(skb_put(skb, pkt_len),
-                                           vp->rx_skbuff[entry]->tail,
+                                           vp->rx_skbuff[entry]->data,
                                            pkt_len);
                                 pci_dma_sync_single_for_device(VORTEX_PCI(vp), dma, PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
                                 vp->rx_copy++;
@@ -2678,7 +2678,7 @@ boomerang_rx(struct net_device *dev)
                         }
                         skb->dev = dev;                 /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
-                        vp->rx_ring[entry].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->tail, PKT_BUF_SZ, PCI_DMA_FROMDEVICE));
+                        vp->rx_ring[entry].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->data, PKT_BUF_SZ, PCI_DMA_FROMDEVICE));
                         vp->rx_skbuff[entry] = skb;
                 }
                 vp->rx_ring[entry].status = 0;  /* Clear complete bit. */
diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
index e4b3c5c88542..7b293f01c9ed 100644
--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -596,7 +596,7 @@ rx_status_loop:
 
                 mapping =
                 cp->rx_skb[rx_tail].mapping =
-                        pci_map_single(cp->pdev, new_skb->tail,
+                        pci_map_single(cp->pdev, new_skb->data,
                                        buflen, PCI_DMA_FROMDEVICE);
                 cp->rx_skb[rx_tail].skb = new_skb;
 
@@ -1101,7 +1101,7 @@ static int cp_refill_rx (struct cp_private *cp)
                 skb_reserve(skb, RX_OFFSET);
 
                 cp->rx_skb[i].mapping = pci_map_single(cp->pdev,
-                        skb->tail, cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                        skb->data, cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 cp->rx_skb[i].skb = skb;
 
                 cp->rx_ring[i].opts2 = 0;
diff --git a/drivers/net/82596.c b/drivers/net/82596.c
index 65f97b1dc581..13b745b39667 100644
--- a/drivers/net/82596.c
+++ b/drivers/net/82596.c
@@ -546,11 +546,11 @@ static inline void init_rx_bufs(struct net_device *dev)
                 rbd->b_next = WSWAPrbd(virt_to_bus(rbd+1));
                 rbd->b_addr = WSWAPrbd(virt_to_bus(rbd));
                 rbd->skb = skb;
-                rbd->v_data = skb->tail;
-                rbd->b_data = WSWAPchar(virt_to_bus(skb->tail));
+                rbd->v_data = skb->data;
+                rbd->b_data = WSWAPchar(virt_to_bus(skb->data));
                 rbd->size = PKT_BUF_SZ;
 #ifdef __mc68000__
-                cache_clear(virt_to_phys(skb->tail), PKT_BUF_SZ);
+                cache_clear(virt_to_phys(skb->data), PKT_BUF_SZ);
 #endif
         }
         lp->rbd_head = lp->rbds;
@@ -816,10 +816,10 @@ static inline int i596_rx(struct net_device *dev)
                                 rx_in_place = 1;
                                 rbd->skb = newskb;
                                 newskb->dev = dev;
-                                rbd->v_data = newskb->tail;
-                                rbd->b_data = WSWAPchar(virt_to_bus(newskb->tail));
+                                rbd->v_data = newskb->data;
+                                rbd->b_data = WSWAPchar(virt_to_bus(newskb->data));
 #ifdef __mc68000__
-                                cache_clear(virt_to_phys(newskb->tail), PKT_BUF_SZ);
+                                cache_clear(virt_to_phys(newskb->data), PKT_BUF_SZ);
 #endif
                         }
                         else
@@ -840,7 +840,7 @@ memory_squeeze:
                                 skb->protocol=eth_type_trans(skb,dev);
                                 skb->len = pkt_len;
 #ifdef __mc68000__
-                                cache_clear(virt_to_phys(rbd->skb->tail),
+                                cache_clear(virt_to_phys(rbd->skb->data),
                                                 pkt_len);
 #endif
                                 netif_rx(skb);
diff --git a/drivers/net/dl2k.c b/drivers/net/dl2k.c
index aa42b7a27735..430c628279b3 100644
--- a/drivers/net/dl2k.c
+++ b/drivers/net/dl2k.c
@@ -547,7 +547,7 @@ rio_timer (unsigned long data)
                                 skb_reserve (skb, 2);
                                 np->rx_ring[entry].fraginfo =
                                     cpu_to_le64 (pci_map_single
-                                         (np->pdev, skb->tail, np->rx_buf_sz,
+                                         (np->pdev, skb->data, np->rx_buf_sz,
                                           PCI_DMA_FROMDEVICE));
                         }
                         np->rx_ring[entry].fraginfo |=
@@ -618,7 +618,7 @@ alloc_list (struct net_device *dev)
                 /* Rubicon now supports 40 bits of addressing space. */
                 np->rx_ring[i].fraginfo =
                     cpu_to_le64 ( pci_map_single (
-                                  np->pdev, skb->tail, np->rx_buf_sz,
+                                  np->pdev, skb->data, np->rx_buf_sz,
                                   PCI_DMA_FROMDEVICE));
                 np->rx_ring[i].fraginfo |= cpu_to_le64 (np->rx_buf_sz) << 48;
         }
@@ -906,7 +906,7 @@ receive_packet (struct net_device *dev)
                                 /* 16 byte align the IP header */
                                 skb_reserve (skb, 2);
                                 eth_copy_and_sum (skb,
-                                                  np->rx_skbuff[entry]->tail,
+                                                  np->rx_skbuff[entry]->data,
                                                   pkt_len, 0);
                                 skb_put (skb, pkt_len);
                                 pci_dma_sync_single_for_device(np->pdev,
@@ -950,7 +950,7 @@ receive_packet (struct net_device *dev)
                         skb_reserve (skb, 2);
                         np->rx_ring[entry].fraginfo =
                             cpu_to_le64 (pci_map_single
-                                         (np->pdev, skb->tail, np->rx_buf_sz,
+                                         (np->pdev, skb->data, np->rx_buf_sz,
                                           PCI_DMA_FROMDEVICE));
                 }
                 np->rx_ring[entry].fraginfo |=
diff --git a/drivers/net/eepro100.c b/drivers/net/eepro100.c
index 98b3a2fdce90..1795425f512e 100644
--- a/drivers/net/eepro100.c
+++ b/drivers/net/eepro100.c
@@ -1269,7 +1269,7 @@ speedo_init_rx_ring(struct net_device *dev)
                 if (skb == NULL)
                         break;                  /* OK.  Just initially short of Rx bufs. */
                 skb->dev = dev;                 /* Mark as being used by this device. */
-                rxf = (struct RxFD *)skb->tail;
+                rxf = (struct RxFD *)skb->data;
                 sp->rx_ringp[i] = rxf;
                 sp->rx_ring_dma[i] =
                         pci_map_single(sp->pdev, rxf,
@@ -1661,7 +1661,7 @@ static inline struct RxFD *speedo_rx_alloc(struct net_device *dev, int entry)
                 sp->rx_ringp[entry] = NULL;
                 return NULL;
         }
-        rxf = sp->rx_ringp[entry] = (struct RxFD *)skb->tail;
+        rxf = sp->rx_ringp[entry] = (struct RxFD *)skb->data;
         sp->rx_ring_dma[entry] =
                 pci_map_single(sp->pdev, rxf,
                                            PKT_BUF_SZ + sizeof(struct RxFD), PCI_DMA_FROMDEVICE);
@@ -1808,10 +1808,10 @@ speedo_rx(struct net_device *dev)
 
 #if 1 || USE_IP_CSUM
                                 /* Packet is in one chunk -- we can copy + cksum. */
-                                eth_copy_and_sum(skb, sp->rx_skbuff[entry]->tail, pkt_len, 0);
+                                eth_copy_and_sum(skb, sp->rx_skbuff[entry]->data, pkt_len, 0);
                                 skb_put(skb, pkt_len);
 #else
-                                memcpy(skb_put(skb, pkt_len), sp->rx_skbuff[entry]->tail,
+                                memcpy(skb_put(skb, pkt_len), sp->rx_skbuff[entry]->data,
                                            pkt_len);
 #endif
                                 pci_dma_sync_single_for_device(sp->pdev, sp->rx_ring_dma[entry],
diff --git a/drivers/net/epic100.c b/drivers/net/epic100.c
index 81ebaedaa240..87f522738bfc 100644
--- a/drivers/net/epic100.c
+++ b/drivers/net/epic100.c
@@ -1003,7 +1003,7 @@ static void epic_init_ring(struct net_device *dev)
                 skb->dev = dev;                 /* Mark as being used by this device. */
                 skb_reserve(skb, 2);    /* 16 byte align the IP header. */
                 ep->rx_ring[i].bufaddr = pci_map_single(ep->pci_dev, 
-                        skb->tail, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                        skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 ep->rx_ring[i].rxstatus = cpu_to_le32(DescOwn);
         }
         ep->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
@@ -1274,7 +1274,7 @@ static int epic_rx(struct net_device *dev, int budget)
                                                             ep->rx_ring[entry].bufaddr,
                                                             ep->rx_buf_sz,
                                                             PCI_DMA_FROMDEVICE);
-                                eth_copy_and_sum(skb, ep->rx_skbuff[entry]->tail, pkt_len, 0);
+                                eth_copy_and_sum(skb, ep->rx_skbuff[entry]->data, pkt_len, 0);
                                 skb_put(skb, pkt_len);
                                 pci_dma_sync_single_for_device(ep->pci_dev,
                                                                ep->rx_ring[entry].bufaddr,
@@ -1308,7 +1308,7 @@ static int epic_rx(struct net_device *dev, int budget)
                         skb->dev = dev;                 /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
                         ep->rx_ring[entry].bufaddr = pci_map_single(ep->pci_dev, 
-                                skb->tail, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                                skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
                         work_done++;
                 }
                 ep->rx_ring[entry].rxstatus = cpu_to_le32(DescOwn);
diff --git a/drivers/net/fealnx.c b/drivers/net/fealnx.c
index 9e0303f6d73c..55dbe9a3fd56 100644
--- a/drivers/net/fealnx.c
+++ b/drivers/net/fealnx.c
@@ -1107,7 +1107,7 @@ static void allocate_rx_buffers(struct net_device *dev)
 
                 skb->dev = dev; /* Mark as being used by this device. */
                 np->lack_rxbuf->skbuff = skb;
-                np->lack_rxbuf->buffer = pci_map_single(np->pci_dev, skb->tail,
+                np->lack_rxbuf->buffer = pci_map_single(np->pci_dev, skb->data,
                         np->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 np->lack_rxbuf->status = RXOWN;
                 ++np->really_rx_count;
@@ -1300,7 +1300,7 @@ static void init_ring(struct net_device *dev)
                 ++np->really_rx_count;
                 np->rx_ring[i].skbuff = skb;
                 skb->dev = dev; /* Mark as being used by this device. */
-                np->rx_ring[i].buffer = pci_map_single(np->pci_dev, skb->tail,
+                np->rx_ring[i].buffer = pci_map_single(np->pci_dev, skb->data,
                         np->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 np->rx_ring[i].status = RXOWN;
                 np->rx_ring[i].control |= RXIC;
@@ -1737,11 +1737,11 @@ static int netdev_rx(struct net_device *dev)
 
 #if ! defined(__alpha__)
                                 eth_copy_and_sum(skb, 
-                                        np->cur_rx->skbuff->tail, pkt_len, 0);
+                                        np->cur_rx->skbuff->data, pkt_len, 0);
                                 skb_put(skb, pkt_len);
 #else
                                 memcpy(skb_put(skb, pkt_len),
-                                        np->cur_rx->skbuff->tail, pkt_len);
+                                        np->cur_rx->skbuff->data, pkt_len);
 #endif
                                 pci_dma_sync_single_for_device(np->pci_dev,
                                                                np->cur_rx->buffer,
diff --git a/drivers/net/hamachi.c b/drivers/net/hamachi.c
index 3d96714ed3cf..d9df1d9a5739 100644
--- a/drivers/net/hamachi.c
+++ b/drivers/net/hamachi.c
@@ -1149,7 +1149,7 @@ static void hamachi_tx_timeout(struct net_device *dev)
                 skb->dev = dev;         /* Mark as being used by this device. */
                 skb_reserve(skb, 2); /* 16 byte align the IP header. */
                 hmp->rx_ring[i].addr = cpu_to_leXX(pci_map_single(hmp->pci_dev, 
-                        skb->tail, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+                        skb->data, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
                 hmp->rx_ring[i].status_n_length = cpu_to_le32(DescOwn | 
                         DescEndPacket | DescIntr | (hmp->rx_buf_sz - 2));
         }
@@ -1210,7 +1210,7 @@ static void hamachi_init_ring(struct net_device *dev)
                 skb->dev = dev;         /* Mark as being used by this device. */
                 skb_reserve(skb, 2); /* 16 byte align the IP header. */
                 hmp->rx_ring[i].addr = cpu_to_leXX(pci_map_single(hmp->pci_dev, 
-                        skb->tail, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+                        skb->data, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
                 /* -2 because it doesn't REALLY have that first 2 bytes -KDU */
                 hmp->rx_ring[i].status_n_length = cpu_to_le32(DescOwn | 
                         DescEndPacket | DescIntr | (hmp->rx_buf_sz -2));
@@ -1509,7 +1509,7 @@ static int hamachi_rx(struct net_device *dev)
                                             desc->addr,
                                             hmp->rx_buf_sz,
                                             PCI_DMA_FROMDEVICE);
-                buf_addr = (u8 *) hmp->rx_skbuff[entry]->tail;
+                buf_addr = (u8 *) hmp->rx_skbuff[entry]->data;
                 frame_status = le32_to_cpu(get_unaligned((s32*)&(buf_addr[data_size - 12])));
                 if (hamachi_debug > 4)
                         printk(KERN_DEBUG "  hamachi_rx() status was %8.8x.\n",
@@ -1678,7 +1678,7 @@ static int hamachi_rx(struct net_device *dev)
                         skb->dev = dev;         /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
                         desc->addr = cpu_to_leXX(pci_map_single(hmp->pci_dev, 
-                                skb->tail, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+                                skb->data, hmp->rx_buf_sz, PCI_DMA_FROMDEVICE));
                 }
                 desc->status_n_length = cpu_to_le32(hmp->rx_buf_sz);
                 if (entry >= RX_RING_SIZE-1)
@@ -1772,9 +1772,9 @@ static int hamachi_close(struct net_device *dev)
                                    readl(ioaddr + RxCurPtr) == (long)&hmp->rx_ring[i] ? '>' : ' ',
                                    i, hmp->rx_ring[i].status_n_length, hmp->rx_ring[i].addr);
                         if (hamachi_debug > 6) {
-                                if (*(u8*)hmp->rx_skbuff[i]->tail != 0x69) {
+                                if (*(u8*)hmp->rx_skbuff[i]->data != 0x69) {
                                         u16 *addr = (u16 *)
-                                                hmp->rx_skbuff[i]->tail;
+                                                hmp->rx_skbuff[i]->data;
                                         int j;
 
                                         for (j = 0; j < 0x50; j++)
diff --git a/drivers/net/lance.c b/drivers/net/lance.c
index ca90f0d1e4b0..b4929beb33b2 100644
--- a/drivers/net/lance.c
+++ b/drivers/net/lance.c
@@ -862,7 +862,7 @@ lance_init_ring(struct net_device *dev, int gfp)
                 lp->rx_skbuff[i] = skb;
                 if (skb) {
                         skb->dev = dev;
-                        rx_buff = skb->tail;
+                        rx_buff = skb->data;
                 } else
                         rx_buff = kmalloc(PKT_BUF_SZ, GFP_DMA | gfp);
                 if (rx_buff == NULL)
diff --git a/drivers/net/lasi_82596.c b/drivers/net/lasi_82596.c
index 5e263fcba669..41bad07ac1ac 100644
--- a/drivers/net/lasi_82596.c
+++ b/drivers/net/lasi_82596.c
@@ -553,14 +553,14 @@ static inline void init_rx_bufs(struct net_device *dev)
                 if (skb == NULL)
                         panic("%s: alloc_skb() failed", __FILE__);
                 skb_reserve(skb, 2);
-                dma_addr = dma_map_single(lp->dev, skb->tail,PKT_BUF_SZ,
+                dma_addr = dma_map_single(lp->dev, skb->data,PKT_BUF_SZ,
                                           DMA_FROM_DEVICE);
                 skb->dev = dev;
                 rbd->v_next = rbd+1;
                 rbd->b_next = WSWAPrbd(virt_to_dma(lp,rbd+1));
                 rbd->b_addr = WSWAPrbd(virt_to_dma(lp,rbd));
                 rbd->skb = skb;
-                rbd->v_data = skb->tail;
+                rbd->v_data = skb->data;
                 rbd->b_data = WSWAPchar(dma_addr);
                 rbd->size = PKT_BUF_SZ;
         }
@@ -783,8 +783,8 @@ static inline int i596_rx(struct net_device *dev)
                                 rx_in_place = 1;
                                 rbd->skb = newskb;
                                 newskb->dev = dev;
-                                dma_addr = dma_map_single(lp->dev, newskb->tail, PKT_BUF_SZ, DMA_FROM_DEVICE);
-                                rbd->v_data = newskb->tail;
+                                dma_addr = dma_map_single(lp->dev, newskb->data, PKT_BUF_SZ, DMA_FROM_DEVICE);
+                                rbd->v_data = newskb->data;
                                 rbd->b_data = WSWAPchar(dma_addr);
                                 CHECK_WBACK_INV(rbd, sizeof(struct i596_rbd));
                         }
diff --git a/drivers/net/natsemi.c b/drivers/net/natsemi.c
index babb59e146ea..9d6d2548c2d3 100644
--- a/drivers/net/natsemi.c
+++ b/drivers/net/natsemi.c
@@ -1926,7 +1926,7 @@ static void refill_rx(struct net_device *dev)
                                 break; /* Better luck next round. */
                         skb->dev = dev; /* Mark as being used by this device. */
                         np->rx_dma[entry] = pci_map_single(np->pci_dev,
-                                skb->tail, buflen, PCI_DMA_FROMDEVICE);
+                                skb->data, buflen, PCI_DMA_FROMDEVICE);
                         np->rx_ring[entry].addr = cpu_to_le32(np->rx_dma[entry]);
                 }
                 np->rx_ring[entry].cmd_status = cpu_to_le32(np->rx_buf_sz);
@@ -2280,7 +2280,7 @@ static void netdev_rx(struct net_device *dev)
                                         buflen,
                                         PCI_DMA_FROMDEVICE);
                                 eth_copy_and_sum(skb,
-                                        np->rx_skbuff[entry]->tail, pkt_len, 0);
+                                        np->rx_skbuff[entry]->data, pkt_len, 0);
                                 skb_put(skb, pkt_len);
                                 pci_dma_sync_single_for_device(np->pci_dev,
                                         np->rx_dma[entry],
diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c
index cc7965271778..e64df4d0800b 100644
--- a/drivers/net/ns83820.c
+++ b/drivers/net/ns83820.c
@@ -574,7 +574,7 @@ static inline int ns83820_add_rx_skb(struct ns83820 *dev, struct sk_buff *skb)
 
         dev->rx_info.next_empty = (next_empty + 1) % NR_RX_DESC;
         cmdsts = REAL_RX_BUF_SIZE | CMDSTS_INTR;
-        buf = pci_map_single(dev->pci_dev, skb->tail,
+        buf = pci_map_single(dev->pci_dev, skb->data,
                              REAL_RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
         build_rx_desc(dev, sg, 0, buf, cmdsts, 0);
         /* update link of previous rx */
@@ -604,7 +604,7 @@ static inline int rx_refill(struct net_device *ndev, int gfp)
                 if (unlikely(!skb))
                         break;
 
-                res = (long)skb->tail & 0xf;
+                res = (long)skb->data & 0xf;
                 res = 0x10 - res;
                 res &= 0xf;
                 skb_reserve(skb, res);
diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
index 3213f3e50487..113b68099216 100644
--- a/drivers/net/pcnet32.c
+++ b/drivers/net/pcnet32.c
@@ -1602,7 +1602,7 @@ pcnet32_init_ring(struct net_device *dev)
 
         rmb();
         if (lp->rx_dma_addr[i] == 0)
-            lp->rx_dma_addr[i] = pci_map_single(lp->pci_dev, rx_skbuff->tail,
+            lp->rx_dma_addr[i] = pci_map_single(lp->pci_dev, rx_skbuff->data,
                     PKT_BUF_SZ-2, PCI_DMA_FROMDEVICE);
         lp->rx_ring[i].base = (u32)le32_to_cpu(lp->rx_dma_addr[i]);
         lp->rx_ring[i].buf_length = le16_to_cpu(2-PKT_BUF_SZ);
@@ -1983,7 +1983,7 @@ pcnet32_rx(struct net_device *dev)
                         lp->rx_skbuff[entry] = newskb;
                         newskb->dev = dev;
                         lp->rx_dma_addr[entry] =
-                            pci_map_single(lp->pci_dev, newskb->tail,
+                            pci_map_single(lp->pci_dev, newskb->data,
                                     PKT_BUF_SZ-2, PCI_DMA_FROMDEVICE);
                         lp->rx_ring[entry].base = le32_to_cpu(lp->rx_dma_addr[entry]);
                         rx_in_place = 1;
@@ -2020,7 +2020,7 @@ pcnet32_rx(struct net_device *dev)
                                                 PKT_BUF_SZ-2,
                                                 PCI_DMA_FROMDEVICE);
                     eth_copy_and_sum(skb,
-                            (unsigned char *)(lp->rx_skbuff[entry]->tail),
+                            (unsigned char *)(lp->rx_skbuff[entry]->data),
                             pkt_len,0);
                     pci_dma_sync_single_for_device(lp->pci_dev,
                                                    lp->rx_dma_addr[entry],
diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index ce449fe90e6d..d5afe05cd826 100644
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -1876,7 +1876,7 @@ static int rtl8169_alloc_rx_skb(struct pci_dev *pdev, struct sk_buff **sk_buff,
         skb_reserve(skb, NET_IP_ALIGN);
         *sk_buff = skb;
 
-        mapping = pci_map_single(pdev, skb->tail, rx_buf_sz,
+        mapping = pci_map_single(pdev, skb->data, rx_buf_sz,
                                  PCI_DMA_FROMDEVICE);
 
         rtl8169_map_to_asic(desc, mapping, rx_buf_sz);
@@ -2336,7 +2336,7 @@ static inline int rtl8169_try_rx_copy(struct sk_buff **sk_buff, int pkt_size,
                 skb = dev_alloc_skb(pkt_size + NET_IP_ALIGN);
                 if (skb) {
                         skb_reserve(skb, NET_IP_ALIGN);
-                        eth_copy_and_sum(skb, sk_buff[0]->tail, pkt_size, 0);
+                        eth_copy_and_sum(skb, sk_buff[0]->data, pkt_size, 0);
                         *sk_buff = skb;
                         rtl8169_mark_to_asic(desc, rx_buf_sz);
                         ret = 0;
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index bb639a8794d4..ea638b162d3f 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -1699,11 +1699,9 @@ static int fill_rx_buffers(struct s2io_nic *nic, int ring_no)
 #else
                 ba = &nic->ba[ring_no][block_no][off];
                 skb_reserve(skb, BUF0_LEN);
-                tmp = (unsigned long) skb->data;
-                tmp += ALIGN_SIZE;
-                tmp &= ~ALIGN_SIZE;
-                skb->data = (void *) tmp;
-                skb->tail = (void *) tmp;
+                tmp = ((unsigned long) skb->data & ALIGN_SIZE);
+                if (tmp)
+                        skb_reserve(skb, (ALIGN_SIZE + 1) - tmp);
 
                 memset(rxdp, 0, sizeof(RxD_t));
                 rxdp->Buffer2_ptr = pci_map_single
diff --git a/drivers/net/sb1250-mac.c b/drivers/net/sb1250-mac.c
index fd2e7c374906..7abd55a4fb21 100644
--- a/drivers/net/sb1250-mac.c
+++ b/drivers/net/sb1250-mac.c
@@ -963,11 +963,11 @@ static int sbdma_add_rcvbuffer(sbmacdma_t *d,struct sk_buff *sb)
         /*
          * Do not interrupt per DMA transfer.
          */
-        dsc->dscr_a = virt_to_phys(sb_new->tail) |
+        dsc->dscr_a = virt_to_phys(sb_new->data) |
                 V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize+ETHER_ALIGN)) |
                 0;
 #else
-        dsc->dscr_a = virt_to_phys(sb_new->tail) |
+        dsc->dscr_a = virt_to_phys(sb_new->data) |
                 V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize+ETHER_ALIGN)) |
                 M_DMA_DSCRA_INTERRUPT;
 #endif
diff --git a/drivers/net/sis900.c b/drivers/net/sis900.c
index 127324f014de..23b713c700b3 100644
--- a/drivers/net/sis900.c
+++ b/drivers/net/sis900.c
@@ -1154,7 +1154,7 @@ sis900_init_rx_ring(struct net_device *net_dev)
                 sis_priv->rx_skbuff[i] = skb;
                 sis_priv->rx_ring[i].cmdsts = RX_BUF_SIZE;
                 sis_priv->rx_ring[i].bufptr = pci_map_single(sis_priv->pci_dev,
-                        skb->tail, RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+                        skb->data, RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
         }
         sis_priv->dirty_rx = (unsigned int) (i - NUM_RX_DESC);
 
@@ -1776,7 +1776,7 @@ static int sis900_rx(struct net_device *net_dev)
                         sis_priv->rx_skbuff[entry] = skb;
                         sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
                         sis_priv->rx_ring[entry].bufptr = 
-                                pci_map_single(sis_priv->pci_dev, skb->tail, 
+                                pci_map_single(sis_priv->pci_dev, skb->data, 
                                         RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                         sis_priv->dirty_rx++;
                 }
@@ -1809,7 +1809,7 @@ static int sis900_rx(struct net_device *net_dev)
                         sis_priv->rx_skbuff[entry] = skb;
                         sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
                         sis_priv->rx_ring[entry].bufptr =
-                                pci_map_single(sis_priv->pci_dev, skb->tail,
+                                pci_map_single(sis_priv->pci_dev, skb->data,
                                         RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
                 }
         }
diff --git a/drivers/net/starfire.c b/drivers/net/starfire.c
index 12e2b6826fa3..88b89dc95c77 100644
--- a/drivers/net/starfire.c
+++ b/drivers/net/starfire.c
@@ -1286,7 +1286,7 @@ static void init_ring(struct net_device *dev)
                 np->rx_info[i].skb = skb;
                 if (skb == NULL)
                         break;
-                np->rx_info[i].mapping = pci_map_single(np->pci_dev, skb->tail, np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                np->rx_info[i].mapping = pci_map_single(np->pci_dev, skb->data, np->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 skb->dev = dev;                 /* Mark as being used by this device. */
                 /* Grrr, we cannot offset to correctly align the IP header. */
                 np->rx_ring[i].rxaddr = cpu_to_dma(np->rx_info[i].mapping | RxDescValid);
@@ -1572,7 +1572,7 @@ static int __netdev_rx(struct net_device *dev, int *quota)
                         pci_dma_sync_single_for_cpu(np->pci_dev,
                                                     np->rx_info[entry].mapping,
                                                     pkt_len, PCI_DMA_FROMDEVICE);
-                        eth_copy_and_sum(skb, np->rx_info[entry].skb->tail, pkt_len, 0);
+                        eth_copy_and_sum(skb, np->rx_info[entry].skb->data, pkt_len, 0);
                         pci_dma_sync_single_for_device(np->pci_dev,
                                                        np->rx_info[entry].mapping,
                                                        pkt_len, PCI_DMA_FROMDEVICE);
@@ -1696,7 +1696,7 @@ static void refill_rx_ring(struct net_device *dev)
                         if (skb == NULL)
                                 break;  /* Better luck next round. */
                         np->rx_info[entry].mapping =
-                                pci_map_single(np->pci_dev, skb->tail, np->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                                pci_map_single(np->pci_dev, skb->data, np->rx_buf_sz, PCI_DMA_FROMDEVICE);
                         skb->dev = dev; /* Mark as being used by this device. */
                         np->rx_ring[entry].rxaddr =
                                 cpu_to_dma(np->rx_info[entry].mapping | RxDescValid);
diff --git a/drivers/net/sundance.c b/drivers/net/sundance.c
index 08cb7177a175..d500a5771dbc 100644
--- a/drivers/net/sundance.c
+++ b/drivers/net/sundance.c
@@ -1028,7 +1028,7 @@ static void init_ring(struct net_device *dev)
                 skb->dev = dev;         /* Mark as being used by this device. */
                 skb_reserve(skb, 2);    /* 16 byte align the IP header. */
                 np->rx_ring[i].frag[0].addr = cpu_to_le32(
-                        pci_map_single(np->pci_dev, skb->tail, np->rx_buf_sz,
+                        pci_map_single(np->pci_dev, skb->data, np->rx_buf_sz,
                                 PCI_DMA_FROMDEVICE));
                 np->rx_ring[i].frag[0].length = cpu_to_le32(np->rx_buf_sz | LastFrag);
         }
@@ -1341,7 +1341,7 @@ static void rx_poll(unsigned long data)
                                                             np->rx_buf_sz,
                                                             PCI_DMA_FROMDEVICE);
 
-                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
+                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->data, pkt_len, 0);
                                 pci_dma_sync_single_for_device(np->pci_dev,
                                                                desc->frag[0].addr,
                                                                np->rx_buf_sz,
@@ -1400,7 +1400,7 @@ static void refill_rx (struct net_device *dev)
                         skb->dev = dev;         /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
                         np->rx_ring[entry].frag[0].addr = cpu_to_le32(
-                                pci_map_single(np->pci_dev, skb->tail,
+                                pci_map_single(np->pci_dev, skb->data,
                                         np->rx_buf_sz, PCI_DMA_FROMDEVICE));
                 }
                 /* Perhaps we need not reset this field. */
diff --git a/drivers/net/tulip/de2104x.c b/drivers/net/tulip/de2104x.c
index dd357dd8c370..fc353e348f9a 100644
--- a/drivers/net/tulip/de2104x.c
+++ b/drivers/net/tulip/de2104x.c
@@ -446,13 +446,13 @@ static void de_rx (struct de_private *de)
 
                         mapping =
                         de->rx_skb[rx_tail].mapping =
-                                pci_map_single(de->pdev, copy_skb->tail,
+                                pci_map_single(de->pdev, copy_skb->data,
                                                buflen, PCI_DMA_FROMDEVICE);
                         de->rx_skb[rx_tail].skb = copy_skb;
                 } else {
                         pci_dma_sync_single_for_cpu(de->pdev, mapping, len, PCI_DMA_FROMDEVICE);
                         skb_reserve(copy_skb, RX_OFFSET);
-                        memcpy(skb_put(copy_skb, len), skb->tail, len);
+                        memcpy(skb_put(copy_skb, len), skb->data, len);
 
                         pci_dma_sync_single_for_device(de->pdev, mapping, len, PCI_DMA_FROMDEVICE);
 
@@ -1269,7 +1269,7 @@ static int de_refill_rx (struct de_private *de)
                 skb->dev = de->dev;
 
                 de->rx_skb[i].mapping = pci_map_single(de->pdev,
-                        skb->tail, de->rx_buf_sz, PCI_DMA_FROMDEVICE);
+                        skb->data, de->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 de->rx_skb[i].skb = skb;
 
                 de->rx_ring[i].opts1 = cpu_to_le32(DescOwn);
diff --git a/drivers/net/tulip/dmfe.c b/drivers/net/tulip/dmfe.c
index 7b899702ceb9..74e9075d9c48 100644
--- a/drivers/net/tulip/dmfe.c
+++ b/drivers/net/tulip/dmfe.c
@@ -945,8 +945,8 @@ static void dmfe_rx_packet(struct DEVICE *dev, struct dmfe_board_info * db)
 
                                 /* Received Packet CRC check need or not */
                                 if ( (db->dm910x_chk_mode & 1) &&
-                                        (cal_CRC(skb->tail, rxlen, 1) !=
-                                        (*(u32 *) (skb->tail+rxlen) ))) { /* FIXME (?) */
+                                        (cal_CRC(skb->data, rxlen, 1) !=
+                                        (*(u32 *) (skb->data+rxlen) ))) { /* FIXME (?) */
                                         /* Found a error received packet */
                                         dmfe_reuse_skb(db, rxptr->rx_skb_ptr);
                                         db->dm910x_chk_mode = 3;
@@ -959,7 +959,7 @@ static void dmfe_rx_packet(struct DEVICE *dev, struct dmfe_board_info * db)
                                                 /* size less than COPY_SIZE, allocate a rxlen SKB */
                                                 skb->dev = dev;
                                                 skb_reserve(skb, 2); /* 16byte align */
-                                                memcpy(skb_put(skb, rxlen), rxptr->rx_skb_ptr->tail, rxlen);
+                                                memcpy(skb_put(skb, rxlen), rxptr->rx_skb_ptr->data, rxlen);
                                                 dmfe_reuse_skb(db, rxptr->rx_skb_ptr);
                                         } else {
                                                 skb->dev = dev;
@@ -1252,7 +1252,7 @@ static void dmfe_reuse_skb(struct dmfe_board_info *db, struct sk_buff * skb)
 
         if (!(rxptr->rdes0 & cpu_to_le32(0x80000000))) {
                 rxptr->rx_skb_ptr = skb;
-                rxptr->rdes2 = cpu_to_le32( pci_map_single(db->pdev, skb->tail, RX_ALLOC_SIZE, PCI_DMA_FROMDEVICE) );
+                rxptr->rdes2 = cpu_to_le32( pci_map_single(db->pdev, skb->data, RX_ALLOC_SIZE, PCI_DMA_FROMDEVICE) );
                 wmb();
                 rxptr->rdes0 = cpu_to_le32(0x80000000);
                 db->rx_avail_cnt++;
@@ -1463,7 +1463,7 @@ static void allocate_rx_buffer(struct dmfe_board_info *db)
                 if ( ( skb = dev_alloc_skb(RX_ALLOC_SIZE) ) == NULL )
                         break;
                 rxptr->rx_skb_ptr = skb; /* FIXME (?) */
-                rxptr->rdes2 = cpu_to_le32( pci_map_single(db->pdev, skb->tail, RX_ALLOC_SIZE, PCI_DMA_FROMDEVICE) );
+                rxptr->rdes2 = cpu_to_le32( pci_map_single(db->pdev, skb->data, RX_ALLOC_SIZE, PCI_DMA_FROMDEVICE) );
                 wmb();
                 rxptr->rdes0 = cpu_to_le32(0x80000000);
                 rxptr = rxptr->next_rx_desc;
diff --git a/drivers/net/tulip/interrupt.c b/drivers/net/tulip/interrupt.c
index afb5cda9d8e1..bb3558164a5b 100644
--- a/drivers/net/tulip/interrupt.c
+++ b/drivers/net/tulip/interrupt.c
@@ -78,7 +78,7 @@ int tulip_refill_rx(struct net_device *dev)
                         if (skb == NULL)
                                 break;
 
-                        mapping = pci_map_single(tp->pdev, skb->tail, PKT_BUF_SZ,
+                        mapping = pci_map_single(tp->pdev, skb->data, PKT_BUF_SZ,
                                                  PCI_DMA_FROMDEVICE);
                         tp->rx_buffers[entry].mapping = mapping;
 
@@ -199,12 +199,12 @@ int tulip_poll(struct net_device *dev, int *budget)
                                                                    tp->rx_buffers[entry].mapping,
                                                                    pkt_len, PCI_DMA_FROMDEVICE);
 #if ! defined(__alpha__)
-                                       eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->tail,
+                                       eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->data,
                                                         pkt_len, 0);
                                        skb_put(skb, pkt_len);
 #else
                                        memcpy(skb_put(skb, pkt_len),
-                                              tp->rx_buffers[entry].skb->tail,
+                                              tp->rx_buffers[entry].skb->data,
                                               pkt_len);
 #endif
                                        pci_dma_sync_single_for_device(tp->pdev,
@@ -423,12 +423,12 @@ static int tulip_rx(struct net_device *dev)
                                                             tp->rx_buffers[entry].mapping,
                                                             pkt_len, PCI_DMA_FROMDEVICE);
 #if ! defined(__alpha__)
-                                eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->tail,
+                                eth_copy_and_sum(skb, tp->rx_buffers[entry].skb->data,
                                                  pkt_len, 0);
                                 skb_put(skb, pkt_len);
 #else
                                 memcpy(skb_put(skb, pkt_len),
-                                       tp->rx_buffers[entry].skb->tail,
+                                       tp->rx_buffers[entry].skb->data,
                                        pkt_len);
 #endif
                                 pci_dma_sync_single_for_device(tp->pdev,
diff --git a/drivers/net/tulip/tulip_core.c b/drivers/net/tulip/tulip_core.c
index 08e0f80f89d5..d45d8f56e5b4 100644
--- a/drivers/net/tulip/tulip_core.c
+++ b/drivers/net/tulip/tulip_core.c
@@ -625,7 +625,7 @@ static void tulip_init_ring(struct net_device *dev)
                 tp->rx_buffers[i].skb = skb;
                 if (skb == NULL)
                         break;
-                mapping = pci_map_single(tp->pdev, skb->tail,
+                mapping = pci_map_single(tp->pdev, skb->data,
                                          PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
                 tp->rx_buffers[i].mapping = mapping;
                 skb->dev = dev;                 /* Mark as being used by this device. */
diff --git a/drivers/net/tulip/winbond-840.c b/drivers/net/tulip/winbond-840.c
index db4b32c2369a..5b1af3986abf 100644
--- a/drivers/net/tulip/winbond-840.c
+++ b/drivers/net/tulip/winbond-840.c
@@ -849,7 +849,7 @@ static void init_rxtx_rings(struct net_device *dev)
                 if (skb == NULL)
                         break;
                 skb->dev = dev;                 /* Mark as being used by this device. */
-                np->rx_addr[i] = pci_map_single(np->pci_dev,skb->tail,
+                np->rx_addr[i] = pci_map_single(np->pci_dev,skb->data,
                                         skb->len,PCI_DMA_FROMDEVICE);
 
                 np->rx_ring[i].buffer1 = np->rx_addr[i];
@@ -1269,7 +1269,7 @@ static int netdev_rx(struct net_device *dev)
                                 pci_dma_sync_single_for_cpu(np->pci_dev,np->rx_addr[entry],
                                                             np->rx_skbuff[entry]->len,
                                                             PCI_DMA_FROMDEVICE);
-                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
+                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->data, pkt_len, 0);
                                 skb_put(skb, pkt_len);
                                 pci_dma_sync_single_for_device(np->pci_dev,np->rx_addr[entry],
                                                                np->rx_skbuff[entry]->len,
@@ -1315,7 +1315,7 @@ static int netdev_rx(struct net_device *dev)
                                 break;                  /* Better luck next round. */
                         skb->dev = dev;                 /* Mark as being used by this device. */
                         np->rx_addr[entry] = pci_map_single(np->pci_dev,
-                                                        skb->tail,
+                                                        skb->data,
                                                         skb->len, PCI_DMA_FROMDEVICE);
                         np->rx_ring[entry].buffer1 = np->rx_addr[entry];
                 }
diff --git a/drivers/net/tulip/xircom_tulip_cb.c b/drivers/net/tulip/xircom_tulip_cb.c
index b8a9b395c5ea..887d7245fe7b 100644
--- a/drivers/net/tulip/xircom_tulip_cb.c
+++ b/drivers/net/tulip/xircom_tulip_cb.c
@@ -899,7 +899,7 @@ static void xircom_init_ring(struct net_device *dev)
                         break;
                 skb->dev = dev;                 /* Mark as being used by this device. */
                 tp->rx_ring[i].status = Rx0DescOwned;   /* Owned by Xircom chip */
-                tp->rx_ring[i].buffer1 = virt_to_bus(skb->tail);
+                tp->rx_ring[i].buffer1 = virt_to_bus(skb->data);
         }
         tp->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
 
@@ -1291,7 +1291,7 @@ xircom_rx(struct net_device *dev)
                         if (skb == NULL)
                                 break;
                         skb->dev = dev;                 /* Mark as being used by this device. */
-                        tp->rx_ring[entry].buffer1 = virt_to_bus(skb->tail);
+                        tp->rx_ring[entry].buffer1 = virt_to_bus(skb->data);
                         work_done++;
                 }
                 tp->rx_ring[entry].status = Rx0DescOwned;
diff --git a/drivers/net/typhoon.c b/drivers/net/typhoon.c
index 8f3392989a06..0b5ca2537963 100644
--- a/drivers/net/typhoon.c
+++ b/drivers/net/typhoon.c
@@ -1661,7 +1661,7 @@ typhoon_alloc_rx_skb(struct typhoon *tp, u32 idx)
 #endif
 
         skb->dev = tp->dev;
-        dma_addr = pci_map_single(tp->pdev, skb->tail,
+        dma_addr = pci_map_single(tp->pdev, skb->data,
                                   PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
 
         /* Since no card does 64 bit DAC, the high bits will never
@@ -1721,7 +1721,7 @@ typhoon_rx(struct typhoon *tp, struct basic_ring *rxRing, volatile u32 * ready,
                         pci_dma_sync_single_for_cpu(tp->pdev, dma_addr,
                                                     PKT_BUF_SZ,
                                                     PCI_DMA_FROMDEVICE);
-                        eth_copy_and_sum(new_skb, skb->tail, pkt_len, 0);
+                        eth_copy_and_sum(new_skb, skb->data, pkt_len, 0);
                         pci_dma_sync_single_for_device(tp->pdev, dma_addr,
                                                        PKT_BUF_SZ,
                                                        PCI_DMA_FROMDEVICE);
diff --git a/drivers/net/via-rhine.c b/drivers/net/via-rhine.c
index be1c1047b9ba..a56ef0df203a 100644
--- a/drivers/net/via-rhine.c
+++ b/drivers/net/via-rhine.c
@@ -990,7 +990,7 @@ static void alloc_rbufs(struct net_device *dev)
                 skb->dev = dev;                 /* Mark as being used by this device. */
 
                 rp->rx_skbuff_dma[i] =
-                        pci_map_single(rp->pdev, skb->tail, rp->rx_buf_sz,
+                        pci_map_single(rp->pdev, skb->data, rp->rx_buf_sz,
                                        PCI_DMA_FROMDEVICE);
 
                 rp->rx_ring[i].addr = cpu_to_le32(rp->rx_skbuff_dma[i]);
@@ -1518,7 +1518,7 @@ static void rhine_rx(struct net_device *dev)
                                                             PCI_DMA_FROMDEVICE);
 
                                 eth_copy_and_sum(skb,
-                                                 rp->rx_skbuff[entry]->tail,
+                                                 rp->rx_skbuff[entry]->data,
                                                  pkt_len, 0);
                                 skb_put(skb, pkt_len);
                                 pci_dma_sync_single_for_device(rp->pdev,
@@ -1561,7 +1561,7 @@ static void rhine_rx(struct net_device *dev)
                                 break;  /* Better luck next round. */
                         skb->dev = dev; /* Mark as being used by this device. */
                         rp->rx_skbuff_dma[entry] =
-                                pci_map_single(rp->pdev, skb->tail,
+                                pci_map_single(rp->pdev, skb->data,
                                                rp->rx_buf_sz,
                                                PCI_DMA_FROMDEVICE);
                         rp->rx_ring[entry].addr = cpu_to_le32(rp->rx_skbuff_dma[entry]);
diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index 15e710283493..abc5cee6eedc 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -1335,7 +1335,7 @@ static inline int velocity_rx_copy(struct sk_buff **rx_skb, int pkt_size,
                         if (vptr->flags & VELOCITY_FLAGS_IP_ALIGN)
                                 skb_reserve(new_skb, 2);
 
-                        memcpy(new_skb->data, rx_skb[0]->tail, pkt_size);
+                        memcpy(new_skb->data, rx_skb[0]->data, pkt_size);
                         *rx_skb = new_skb;
                         ret = 0;
                 }
@@ -1456,9 +1456,9 @@ static int velocity_alloc_rx_buf(struct velocity_info *vptr, int idx)
          *      Do the gymnastics to get the buffer head for data at
          *      64byte alignment.
          */
-        skb_reserve(rd_info->skb, (unsigned long) rd_info->skb->tail & 63);
+        skb_reserve(rd_info->skb, (unsigned long) rd_info->skb->data & 63);
         rd_info->skb->dev = vptr->dev;
-        rd_info->skb_dma = pci_map_single(vptr->pdev, rd_info->skb->tail, vptr->rx_buf_sz, PCI_DMA_FROMDEVICE);
+        rd_info->skb_dma = pci_map_single(vptr->pdev, rd_info->skb->data, vptr->rx_buf_sz, PCI_DMA_FROMDEVICE);
         
         /*
          *      Fill in the descriptor to match
diff --git a/drivers/net/wan/hdlc_cisco.c b/drivers/net/wan/hdlc_cisco.c
index c1b6896d7007..87496843681a 100644
--- a/drivers/net/wan/hdlc_cisco.c
+++ b/drivers/net/wan/hdlc_cisco.c
@@ -72,7 +72,7 @@ static void cisco_keepalive_send(struct net_device *dev, u32 type,
         }
         skb_reserve(skb, 4);
         cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
-        data = (cisco_packet*)skb->tail;
+        data = (cisco_packet*)skb->data;
 
         data->type = htonl(type);
         data->par1 = htonl(par1);
diff --git a/drivers/net/yellowfin.c b/drivers/net/yellowfin.c
index 9da925430109..1c2506535f7e 100644
--- a/drivers/net/yellowfin.c
+++ b/drivers/net/yellowfin.c
@@ -786,7 +786,7 @@ static void yellowfin_init_ring(struct net_device *dev)
                 skb->dev = dev;         /* Mark as being used by this device. */
                 skb_reserve(skb, 2);    /* 16 byte align the IP header. */
                 yp->rx_ring[i].addr = cpu_to_le32(pci_map_single(yp->pci_dev,
-                        skb->tail, yp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+                        skb->data, yp->rx_buf_sz, PCI_DMA_FROMDEVICE));
         }
         yp->rx_ring[i-1].dbdma_cmd = cpu_to_le32(CMD_STOP);
         yp->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
@@ -1111,7 +1111,7 @@ static int yellowfin_rx(struct net_device *dev)
                 pci_dma_sync_single_for_cpu(yp->pci_dev, desc->addr,
                         yp->rx_buf_sz, PCI_DMA_FROMDEVICE);
                 desc_status = le32_to_cpu(desc->result_status) >> 16;
-                buf_addr = rx_skb->tail;
+                buf_addr = rx_skb->data;
                 data_size = (le32_to_cpu(desc->dbdma_cmd) - 
                         le32_to_cpu(desc->result_status)) & 0xffff;
                 frame_status = le16_to_cpu(get_unaligned((s16*)&(buf_addr[data_size - 2])));
@@ -1185,7 +1185,7 @@ static int yellowfin_rx(struct net_device *dev)
                                         break;
                                 skb->dev = dev;
                                 skb_reserve(skb, 2);    /* 16 byte align the IP header */
-                                eth_copy_and_sum(skb, rx_skb->tail, pkt_len, 0);
+                                eth_copy_and_sum(skb, rx_skb->data, pkt_len, 0);
                                 skb_put(skb, pkt_len);
                                 pci_dma_sync_single_for_device(yp->pci_dev, desc->addr,
                                                                                            yp->rx_buf_sz,
@@ -1211,7 +1211,7 @@ static int yellowfin_rx(struct net_device *dev)
                         skb->dev = dev; /* Mark as being used by this device. */
                         skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
                         yp->rx_ring[entry].addr = cpu_to_le32(pci_map_single(yp->pci_dev,
-                                skb->tail, yp->rx_buf_sz, PCI_DMA_FROMDEVICE));
+                                skb->data, yp->rx_buf_sz, PCI_DMA_FROMDEVICE));
                 }
                 yp->rx_ring[entry].dbdma_cmd = cpu_to_le32(CMD_STOP);
                 yp->rx_ring[entry].result_status = 0;   /* Clear complete bit. */