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

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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>
This commit is contained in:
Wei Yang 2013-08-02 17:31:03 +08:00 committed by Bjorn Helgaas
parent 3b2f64d00c
commit f2a230bd4e
1 changed files with 3 additions and 6 deletions
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9
drivers/pci/setup-bus.c
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@ -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;
}