i386/x86-64: Return defined error value for bad PCI config space accesses Mostly to get better handling when a extended config space access has to fallback to Type1. Signed-off-by: Andi Kleen --- arch/i386/pci/direct.c | 4 +++- arch/i386/pci/mmconfig.c | 4 +++- arch/x86_64/pci/mmconfig.c | 4 +++- 3 files changed, 9 insertions(+), 3 deletions(-) Index: linux/arch/i386/pci/direct.c =================================================================== --- linux.orig/arch/i386/pci/direct.c +++ linux/arch/i386/pci/direct.c @@ -19,8 +19,10 @@ int pci_conf1_read(unsigned int seg, uns { unsigned long flags; - if (!value || (bus > 255) || (devfn > 255) || (reg > 255)) + if (!value || (bus > 255) || (devfn > 255) || (reg > 255)) { + *value = -1; return -EINVAL; + } spin_lock_irqsave(&pci_config_lock, flags); Index: linux/arch/i386/pci/mmconfig.c =================================================================== --- linux.orig/arch/i386/pci/mmconfig.c +++ linux/arch/i386/pci/mmconfig.c @@ -80,8 +80,10 @@ static int pci_mmcfg_read(unsigned int s unsigned long flags; u32 base; - if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) + if (!value || (bus > 255) || (devfn > 255) || (reg > 4095)) { + *value = -1; return -EINVAL; + } base = get_base_addr(seg, bus, devfn); if (!base) Index: linux/arch/x86_64/pci/mmconfig.c =================================================================== --- linux.orig/arch/x86_64/pci/mmconfig.c +++ linux/arch/x86_64/pci/mmconfig.c @@ -75,8 +75,10 @@ static int pci_mmcfg_read(unsigned int s char __iomem *addr; /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ - if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095))) + if (unlikely(!value || (bus > 255) || (devfn > 255) || (reg > 4095))) { + *value = -1; return -EINVAL; + } addr = pci_dev_base(seg, bus, devfn); if (!addr)