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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2009-03-20 14:55:55 -0600
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-03-20 14:56:36 -0700
commit79af72d716cf1bb13b175429cf181a6c4d063ee8 (patch)
tree2665c3e34983c8bcaf5fec76480fda163a88b045 /include/linux/pci.h
parent068258bc15439c11a966e873f931cc8e513dca61 (diff)
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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>
Diffstat (limited to 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1216843..50d9438 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -357,6 +357,15 @@ 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)
{