Function dpc_probe() defined in drivers/pci/pcie/dpc.c calls pci_find_ext_capability(). Function pci_find_ext_capability() returns the address of the requested extended capability structure within the device's PCI configuration space or 0 if the device does not support it. The return value of this function should be checked against 0. --- drivers/pci/pcie/dpc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index f03279f..30ff550 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -226,6 +226,8 @@ static int dpc_probe(struct pcie_device *dev) return -ENOMEM; dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC); + if (!dpc->cap_pos) + return -ENODEV; dpc->dev = dev; set_service_data(dev, dpc); -- 2.6.4
