1 files changed, 27 insertions, 6 deletions

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index c0ecf250fe51..b26626dc517c 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -38,15 +38,26 @@ count_resource(struct acpi_resource *acpi_res, void *data)
         struct acpi_resource_address64 addr;
         acpi_status status;
 
-        if (info->res_num >= PCI_BUS_NUM_RESOURCES)
-                return AE_OK;
-
         status = resource_to_addr(acpi_res, &addr);
         if (ACPI_SUCCESS(status))
                 info->res_num++;
         return AE_OK;
 }
 
+static int
+bus_has_transparent_bridge(struct pci_bus *bus)
+{
+        struct pci_dev *dev;
+
+        list_for_each_entry(dev, &bus->devices, bus_list) {
+                u16 class = dev->class >> 8;
+
+                if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent)
+                        return true;
+        }
+        return false;
+}
+
 static acpi_status
 setup_resource(struct acpi_resource *acpi_res, void *data)
 {
@@ -56,9 +67,7 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
         acpi_status status;
         unsigned long flags;
         struct resource *root;
-
-        if (info->res_num >= PCI_BUS_NUM_RESOURCES)
-                return AE_OK;
+        int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
 
         status = resource_to_addr(acpi_res, &addr);
         if (!ACPI_SUCCESS(status))
@@ -82,6 +91,18 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
         res->end = res->start + addr.address_length - 1;
         res->child = NULL;
 
+        if (bus_has_transparent_bridge(info->bus))
+                max_root_bus_resources -= 3;
+        if (info->res_num >= max_root_bus_resources) {
+                printk(KERN_WARNING "PCI: Failed to allocate 0x%lx-0x%lx "
+                        "from %s for %s due to _CRS returning more than "
+                        "%d resource descriptors\n", (unsigned long) res->start,
+                        (unsigned long) res->end, root->name, info->name,
+                        max_root_bus_resources);
+                info->res_num++;
+                return AE_OK;
+        }
+
         if (insert_resource(root, res)) {
                 printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
                         "from %s for %s\n", (unsigned long) res->start,