Messages in this thread Patch in this message | | | From | Alex Chiang <> | Subject | [PATCH v5 01/13] PCI: pci_is_root_bus helper | Date | Fri, 20 Mar 2009 14:55:55 -0600 |
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From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
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> ---
include/linux/pci.h | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/include/linux/pci.h b/include/linux/pci.h index 1f6c5dd..72ccf15 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -341,6 +341,15 @@ struct pci_bus { #define pci_bus_b(n) list_entry(n, struct pci_bus, node) #define to_pci_bus(n) container_of(n, struct pci_bus, dev) +/* + * Returns true if the pci bus is root (behind host-pci bridge), + * false otherwise + */ +static inline bool pci_is_root_bus(struct pci_bus *pbus) +{ + return !(pbus->parent); +} + #ifdef CONFIG_PCI_MSI static inline bool pci_dev_msi_enabled(struct pci_dev *pci_dev) {
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