netxen: fix infinite loop on dma mapping failure

Fix a perpetual while() loop in unwinding partial
mapped tx skb on dma mapping failure.

Reported-by: "Juha Leppanen" <juha_motorsportcom@luukku.com>
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 53d57dc4d644..41b29671fc9a 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -1577,8 +1577,8 @@ netxen_map_tx_skb(struct pci_dev *pdev,
         return 0;
 
 unwind:
-        while (i > 0) {
-                nf = &pbuf->frag_array[i];
+        while (--i >= 0) {
+                nf = &pbuf->frag_array[i+1];
                 pci_unmap_page(pdev, nf->dma, nf->length, PCI_DMA_TODEVICE);
         }