netxen: avoid invalid iounmap

For NX3031 only one I/O range is mapped, so unmapping other
two which are used by older chips, causes this warning on
ppc64.

"Attempt to iounmap early bolted mapping at 0x0000000000000000"

Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 86867405a367..f8e26290a22f 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -1004,8 +1004,10 @@ static void __devexit netxen_nic_remove(struct pci_dev *pdev)
 
         iounmap(adapter->ahw.db_base);
         iounmap(adapter->ahw.pci_base0);
-        iounmap(adapter->ahw.pci_base1);
-        iounmap(adapter->ahw.pci_base2);
+        if (adapter->ahw.pci_base1 != NULL)
+                iounmap(adapter->ahw.pci_base1);
+        if (adapter->ahw.pci_base2 != NULL)
+                iounmap(adapter->ahw.pci_base2);
 
         pci_release_regions(pdev);
         pci_disable_device(pdev);