[PATCH v2 2/4] PCI: introduce pci_bus_get()/pci_bus_put() to hide pci_bus' reference management

[Gu Zheng <guz.fnst@cn.fujitsu.com>]

>From ff785e84afd2558dd52de8e73c4f75b7563a595b Mon Sep 17 00:00:00 2001
From: Gu Zheng <guz.fnst@cn.fujitsu.com>
Date: Tue, 30 Apr 2013 17:22:02 +0900
Subject: [PATCH v2 2/4] PCI: introduce pci_bus_get()/pci_bus_put() to hide
 pci_bus' reference management

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
---
 drivers/pci/bus.c   |   15 +++++++++++++++
 include/linux/pci.h |    3 +++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 748f8f3..93f4dc0 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -18,6 +18,21 @@
 
 #include "pci.h"
 
+struct pci_bus *pci_bus_get(struct pci_bus *bus)
+{
+	if (bus)
+		get_device(&bus->dev);
+	return bus;
+}
+EXPORT_SYMBOL(pci_bus_get);
+
+void pci_bus_put(struct pci_bus *bus)
+{
+	if (bus)
+		put_device(&bus->dev);
+}
+EXPORT_SYMBOL(pci_bus_put);
+
 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
 			     resource_size_t offset)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6c09949..2581e53 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1020,6 +1020,9 @@ int pci_request_selected_regions_exclusive(struct pci_dev *, int, const char *);
 void pci_release_selected_regions(struct pci_dev *, int);
 
 /* drivers/pci/bus.c */
+extern struct pci_bus *pci_bus_get(struct pci_bus *bus);
+extern void pci_bus_put(struct pci_bus *bus);
+
 void pci_add_resource(struct list_head *resources, struct resource *res);
 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
 			     resource_size_t offset);
-- 
1.7.7