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PCI: Introduce pci_bus_{get|put}() to manage PCI bus reference count

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Introduce helper functions pci_bus_{get|put}() to manage PCI bus
reference count.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jiang Liu 2013-05-25 21:48:29 +08:00 committed by Bjorn Helgaas
parent f722406faa
commit fe830ef62a
2 changed files with 17 additions and 0 deletions
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15
drivers/pci/bus.c
View File

@ -283,6 +283,21 @@ void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
} }
EXPORT_SYMBOL_GPL(pci_walk_bus); 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(pci_bus_alloc_resource);
EXPORT_SYMBOL_GPL(pci_bus_add_device); EXPORT_SYMBOL_GPL(pci_bus_add_device);
EXPORT_SYMBOL(pci_bus_add_devices); EXPORT_SYMBOL(pci_bus_add_devices);

2
include/linux/pci.h
View File

@ -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); void pci_release_selected_regions(struct pci_dev *, int);
/* drivers/pci/bus.c */ /* 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(struct list_head *resources, struct resource *res);
void pci_add_resource_offset(struct list_head *resources, struct resource *res, void pci_add_resource_offset(struct list_head *resources, struct resource *res,
resource_size_t offset); resource_size_t offset);