[PATCH RFC 01/17] PCI: introduce pci_bus_get()/pci_bus_put() to hide PCI implementation details

[Jiang Liu <liuj97@gmail.com>]

Introduce pci_bus_get()/pci_bus_put() to hide PCI implementation details.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
---
 drivers/pci/bus.c   |   15 +++++++++++++++
 include/linux/pci.h |    2 ++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 4ce5ef2..50f9c5d 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -35,6 +35,21 @@ void pci_add_resource_offset(struct list_head *resources, struct resource *res,
 }
 EXPORT_SYMBOL(pci_add_resource_offset);
 
+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(struct list_head *resources, struct resource *res)
 {
 	pci_add_resource_offset(resources, res, 0);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e444f5b..0603a60 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -912,6 +912,8 @@ 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 */
+struct pci_bus *pci_bus_get(struct pci_bus *bus);
+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);
-- 
1.7.5.4