[RFC PATCH v2 05/12] PCI: beef up pci_do_scan_bus()

[Alex Chiang <achiang@hp.com>]

We have a nice interface for re-scanning a PCI bus which will
discover newly added devices, add them to the device tree, and
enable them properly.

Ensure that the bridge resources are properly sized and assigned
during the rescan.

Signed-off-by: Alex Chiang <achiang@hp.com>
---

 drivers/pci/hotplug-pci.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/hotplug-pci.c b/drivers/pci/hotplug-pci.c
index 4d4a644..33ab2d2 100644
--- a/drivers/pci/hotplug-pci.c
+++ b/drivers/pci/hotplug-pci.c
@@ -6,13 +6,21 @@
 
 unsigned int __devinit pci_do_scan_bus(struct pci_bus *bus)
 {
-	unsigned int max;
+	unsigned int max, pass;
+	struct pci_dev *dev;
 
 	max = pci_scan_child_bus(bus);
 
-	/*
-	 * Make the discovered devices available.
-	 */
+	for (pass=0; pass < 2; pass++)
+		list_for_each_entry(dev, &bus->devices, bus_list) {
+			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
+			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
+				if (pass && dev->subordinate)
+					pci_bus_size_bridges(dev->subordinate);
+		}
+
+	pci_bus_assign_resources(bus);
+	pci_enable_bridges(bus);
 	pci_bus_add_devices(bus);
 
 	return max;