PCI: pci_is_root_bus helper
Introduce pci_is_root_bus helper function. This will help make code more consistent, as well as prevent incorrect assumptions (such as pci_bus->self == NULL on a root bus, which is not always true). Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@ -357,6 +357,15 @@ struct pci_bus {
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#define pci_bus_b(n) list_entry(n, struct pci_bus, node)
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#define to_pci_bus(n) container_of(n, struct pci_bus, dev)
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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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static inline bool pci_is_root_bus(struct pci_bus *pbus)
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{
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return !(pbus->parent);
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}
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#ifdef CONFIG_PCI_MSI
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static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev)
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{
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