[PATCH] mmconfig: fix unreachable_devices()

Currently, unreachable_devices() compares value of mmconfig and value
of conf1. But it doesn't check the device is reachable or not.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 7 insertions, 5 deletions

diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index 4ea0852487a4..473db6257013 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -43,12 +43,14 @@ static void __init unreachable_devices(void)
                         if (val1 == 0xffffffff)
                                 continue;
 
-                        raw_pci_ops->read(0, bus, devfn, 0, 4, &val2);
-                        if (val1 != val2) {
-                                set_bit(i + 32 * bus, pci_mmcfg_fallback_slots);
-                                printk(KERN_NOTICE "PCI: No mmconfig possible"
-                                       " on device %02x:%02x\n", bus, i);
+                        if (pci_mmcfg_arch_reachable(0, bus, devfn)) {
+                                raw_pci_ops->read(0, bus, devfn, 0, 4, &val2);
+                                if (val1 == val2)
+                                        continue;
                         }
+                        set_bit(i + 32 * bus, pci_mmcfg_fallback_slots);
+                        printk(KERN_NOTICE "PCI: No mmconfig possible on device"
+                               " %02x:%02x\n", bus, i);
                 }
         }
 }