From: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Date: Fri, 20 Mar 2009 20:55:55 +0000 (-0600)
Subject: PCI: pci_is_root_bus helper
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=79af72d716cf1bb13b175429cf181a6c4d063ee8;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

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>
---

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1216843412da..50d94388e87c 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)
 {