Introduce helper functions pci_bus_{get|put}() to manage PCI bus
reference count.
Signed-off-by: Jiang Liu <jiang....@huawei.com>
Signed-off-by: Yijing Wang <wangyij...@huawei.com>
Signed-off-by: Gu Zheng <guz.f...@cn.fujitsu.com>
Cc: linux-...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
drivers/pci/bus.c | 15 +++++++++++++++
include/linux/pci.h | 2 ++
2 files changed, 17 insertions(+)
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 32e66a6..b1ff02a 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -283,6 +283,21 @@ void pci_walk_bus(struct pci_bus *top, int (*cb)(struct
pci_dev *, void *),
}
EXPORT_SYMBOL_GPL(pci_walk_bus);
+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);
+
EXPORT_SYMBOL(pci_bus_alloc_resource);
EXPORT_SYMBOL_GPL(pci_bus_add_device);
EXPORT_SYMBOL(pci_bus_add_devices);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 3a24e4f..7556c59 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1018,6 +1018,8 @@ 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);
--
1.8.1.2
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