linux-kernel - [PATCH v4 01/12] PCI: pci_is_root

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Message-ID: <20090318223930.887.45421.stgit@bob.kio>
Date:	Wed, 18 Mar 2009 16:39:30 -0600
From:	Alex Chiang <achiang@...com>
To:	jbarnes@...tuousgeek.org
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Alex Chiang <achiang@...com>
Subject: [PATCH v4 01/12] PCI: pci_is_root_bus helper

From: Kenji Kaneshige <kaneshige.kenji@...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@...fujitsu.com>
Signed-off-by: Alex Chiang <achiang@...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 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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