atl1c: Check return from pci_find_ext_capability() in atl1c_reset_pcie()

The function atl1c_reset_pcie() does not check the return from
pci_find_ext_cabability() where it is getting the postion of the
PCI_EXT_CAP_ID_ERR. It is possible for the return to be 0.

Signed-off-by: Betty Dall <betty.dall@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index a36a760ada28af64272a5132a60648c543963bed..29801750f239b247389c7040f6616f9b79d14983 100644 (file)
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -145,9 +145,11 @@ static void atl1c_reset_pcie(struct atl1c_hw *hw, u32 flag)
         * Mask some pcie error bits
         */
        pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
-       pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
-       data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
-       pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
+       if (pos) {
+               pci_read_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, &data);
+               data &= ~(PCI_ERR_UNC_DLP | PCI_ERR_UNC_FCP);
+               pci_write_config_dword(pdev, pos + PCI_ERR_UNCOR_SEVER, data);
+       }
        /* clear error status */
        pcie_capability_write_word(pdev, PCI_EXP_DEVSTA,
                        PCI_EXP_DEVSTA_NFED |