From: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Alex Chiang <achiang@xxxxxx>
---
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 7baf2a5..a31f935 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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