x86, mrst: Don't blindly access extended config space

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / x86 / pci / mrst.c

diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
index 8bf2fcb..1cdc02c 100644 (file)
--- a/arch/x86/pci/mrst.c
+++ b/arch/x86/pci/mrst.c
@@ -247,6 +247,10 @@ static void __devinit pci_fixed_bar_fixup(struct pci_dev *dev)
        u32 size;
        int i;
 
+       /* Must have extended configuration space */
+       if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
+               return;
+
        /* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
        offset = fixed_bar_cap(dev->bus, dev->devfn);
        if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||