1 files changed, 6 insertions, 11 deletions

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index b19d1e54201..8f3f9a50b1e 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -303,22 +303,17 @@ static void __init pci_mmcfg_check_end_bus_number(void)
 {
         struct pci_mmcfg_region *cfg, *cfgx;
 
-        /* last one*/
-        cfg = list_entry(pci_mmcfg_list.prev, typeof(*cfg), list);
-        if (cfg)
-                if (cfg->end_bus < cfg->start_bus)
-                        cfg->end_bus = 255;
-
-        if (list_is_singular(&pci_mmcfg_list))
-                return;
-
-        /* don't overlap please */
+        /* Fixup overlaps */
         list_for_each_entry(cfg, &pci_mmcfg_list, list) {
                 if (cfg->end_bus < cfg->start_bus)
                         cfg->end_bus = 255;
 
+                /* Don't access the list head ! */
+                if (cfg->list.next == &pci_mmcfg_list)
+                        break;
+
                 cfgx = list_entry(cfg->list.next, typeof(*cfg), list);
-                if (cfg != cfgx && cfg->end_bus >= cfgx->start_bus)
+                if (cfg->end_bus >= cfgx->start_bus)
                         cfg->end_bus = cfgx->start_bus - 1;
         }
 }