1 files changed, 11 insertions, 2 deletions

diff --git a/arch/i386/pci/direct.c b/arch/i386/pci/direct.c
index 99012b93bd12..5d81fb510375 100644
--- a/arch/i386/pci/direct.c
+++ b/arch/i386/pci/direct.c
@@ -4,6 +4,7 @@
 
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/dmi.h>
 #include "pci.h"
 
 /*
@@ -18,8 +19,10 @@ int pci_conf1_read(unsigned int seg, unsigned int bus,
 {
         unsigned long flags;
 
-        if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
+        if ((bus > 255) || (devfn > 255) || (reg > 255)) {
+                *value = -1;
                 return -EINVAL;
+        }
 
         spin_lock_irqsave(&pci_config_lock, flags);
 
@@ -91,8 +94,10 @@ static int pci_conf2_read(unsigned int seg, unsigned int bus,
         unsigned long flags;
         int dev, fn;
 
-        if (!value || (bus > 255) || (devfn > 255) || (reg > 255))
+        if ((bus > 255) || (devfn > 255) || (reg > 255)) {
+                *value = -1;
                 return -EINVAL;
+        }
 
         dev = PCI_SLOT(devfn);
         fn = PCI_FUNC(devfn);
@@ -188,6 +193,10 @@ static int __init pci_sanity_check(struct pci_raw_ops *o)
 
         if (pci_probe & PCI_NO_CHECKS)
                 return 1;
+        /* Assume Type 1 works for newer systems.
+           This handles machines that don't have anything on PCI Bus 0. */
+        if (dmi_get_year(DMI_BIOS_DATE) >= 2001)
+                return 1;
 
         for (devfn = 0; devfn < 0x100; devfn++) {
                 if (o->read(0, 0, devfn, PCI_CLASS_DEVICE, 2, &x))