PCI: Enumerate subordinate buses, not devices, in pci_bus_get_depth()

Normally, on one PCI bus there would be more devices than bridges.  When
calculating the depth of a PCI bus, it would be more time efficient to
enumerating through the child buses instead of the child devices.

Also by doing so, the code seems more self explaining.  Previously, it went
through the devices and checked whether a bridge introduced a child bus or
not, which needs more background knowledge to understand it.

This patch calculates the depth by enumerating the bus hierarchy.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index d254e237953382bb99768c7cca79b65c3b9aded8..6dbe5629c8b4ccf2c9793c97644f1c6f70636524 100644 (file)
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1300,15 +1300,12 @@ static void pci_bus_dump_resources(struct pci_bus *bus)
 static int __init pci_bus_get_depth(struct pci_bus *bus)
 {
        int depth = 0;
-       struct pci_dev *dev;
+       struct pci_bus *child_bus;
 
-       list_for_each_entry(dev, &bus->devices, bus_list) {
+       list_for_each_entry(child_bus, &bus->children, node){
                int ret;
-               struct pci_bus *b = dev->subordinate;
-               if (!b)
-                       continue;
 
-               ret = pci_bus_get_depth(b);
+               ret = pci_bus_get_depth(child_bus);
                if (ret + 1 > depth)
                        depth = ret + 1;
        }