PCI: add default busn_res for pci_scan_bus()

also do not need to shrink busn_res.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 68e75cb0831b..9f68b9d3597c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1836,9 +1836,10 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
 
         pci_add_resource(&resources, &ioport_resource);
         pci_add_resource(&resources, &iomem_resource);
+        pci_add_resource(&resources, &busn_resource);
         b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
         if (b)
-                b->busn_res.end = pci_scan_child_bus(b);
+                pci_scan_child_bus(b);
         else
                 pci_free_resource_list(&resources);
         return b;
@@ -1853,9 +1854,10 @@ struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops,
 
         pci_add_resource(&resources, &ioport_resource);
         pci_add_resource(&resources, &iomem_resource);
+        pci_add_resource(&resources, &busn_resource);
         b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
         if (b) {
-                b->busn_res.end = pci_scan_child_bus(b);
+                pci_scan_child_bus(b);
                 pci_bus_add_devices(b);
         } else {
                 pci_free_resource_list(&resources);