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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>
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1 changed files with 3 additions and 6 deletions
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@ -1300,15 +1300,12 @@ static void pci_bus_dump_resources(struct pci_bus *bus)
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static int __init pci_bus_get_depth(struct pci_bus *bus)
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{
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int depth = 0;
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struct pci_dev *dev;
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struct pci_bus *child_bus;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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list_for_each_entry(child_bus, &bus->children, node){
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int ret;
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struct pci_bus *b = dev->subordinate;
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if (!b)
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continue;
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ret = pci_bus_get_depth(b);
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ret = pci_bus_get_depth(child_bus);
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if (ret + 1 > depth)
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depth = ret + 1;
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}
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