PCI: Document reason for using pci_is_root_bus()
Some code assumes "bus->self == NULL" means the bus is a root bus. This adds a comment explaining why this is incorrect ("virtual" buses added for SR-IOV have "bus->self == NULL" but are not root buses). No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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@ -470,6 +470,10 @@ struct pci_bus {
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/*
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* Returns true if the pci bus is root (behind host-pci bridge),
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* false otherwise
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*
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* Some code assumes that "bus->self == NULL" means that bus is a root bus.
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* This is incorrect because "virtual" buses added for SR-IOV (via
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* virtfn_add_bus()) have "bus->self == NULL" but are not root buses.
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*/
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static inline bool pci_is_root_bus(struct pci_bus *pbus)
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{
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