[PATCH] PCI: handle bogus MCFG entries

[powerpc.git] / arch / i386 / pci / mmconfig.c

diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index 4bb4d4b..0ee8a98 100644 (file)
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -36,8 +36,7 @@ static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
        while (1) {
                ++cfg_num;
                if (cfg_num >= pci_mmcfg_config_num) {
-                       /* Not found - fallback to type 1 */
-                       return 0;
+                       break;
                }
                cfg = &pci_mmcfg_config[cfg_num];
                if (cfg->pci_segment_group_number != seg)
@@ -46,6 +45,18 @@ static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
                    (cfg->end_bus_number >= bus))
                        return cfg->base_address;
        }
+
+       /* Handle more broken MCFG tables on Asus etc.
+          They only contain a single entry for bus 0-0. Assume
+          this applies to all busses. */
+       cfg = &pci_mmcfg_config[0];
+       if (pci_mmcfg_config_num == 1 &&
+               cfg->pci_segment_group_number == 0 &&
+               (cfg->start_bus_number | cfg->end_bus_number) == 0)
+               return cfg->base_address;
+
+       /* Fall back to type 0 */
+       return 0;
 }
 
 static inline void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)