via-velocity: Fix DMA mapping length errors on transmit.

From: Dave Jones <davej@redhat.com>

The dma-debug changes caught that this driver uses the
wrong DMA mapping length when skb_padto() does something.

With suggestions from Eric Dumazet.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 8 deletions

diff --git a/drivers/net/via-velocity.c b/drivers/net/via-velocity.c
index c5691fdb7079..fb53ef872df3 100644
--- a/drivers/net/via-velocity.c
+++ b/drivers/net/via-velocity.c
@@ -1838,17 +1838,19 @@ static void velocity_free_tx_buf(struct velocity_info *vptr, struct velocity_td_
 {
         struct sk_buff *skb = tdinfo->skb;
         int i;
+        int pktlen;
 
         /*
          *      Don't unmap the pre-allocated tx_bufs
          */
         if (tdinfo->skb_dma) {
 
+                pktlen = (skb->len > ETH_ZLEN ? : ETH_ZLEN);
                 for (i = 0; i < tdinfo->nskb_dma; i++) {
 #ifdef VELOCITY_ZERO_COPY_SUPPORT
                         pci_unmap_single(vptr->pdev, tdinfo->skb_dma[i], le16_to_cpu(td->tdesc1.len), PCI_DMA_TODEVICE);
 #else
-                        pci_unmap_single(vptr->pdev, tdinfo->skb_dma[i], skb->len, PCI_DMA_TODEVICE);
+                        pci_unmap_single(vptr->pdev, tdinfo->skb_dma[i], pktlen, PCI_DMA_TODEVICE);
 #endif
                         tdinfo->skb_dma[i] = 0;
                 }
@@ -2080,17 +2082,14 @@ static int velocity_xmit(struct sk_buff *skb, struct net_device *dev)
         struct tx_desc *td_ptr;
         struct velocity_td_info *tdinfo;
         unsigned long flags;
-        int pktlen = skb->len;
+        int pktlen;
         __le16 len;
         int index;
 
 
-
-        if (skb->len < ETH_ZLEN) {
-                if (skb_padto(skb, ETH_ZLEN))
-                        goto out;
-                pktlen = ETH_ZLEN;
-        }
+        if (skb_padto(skb, ETH_ZLEN))
+                goto out;
+        pktlen = max_t(unsigned int, skb->len, ETH_ZLEN);
 
         len = cpu_to_le16(pktlen);