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    Subject[RFC PATCH v1 05/22] PCI: introduce pci_bus_{get|put}() to manage PCI bus reference count
    Date
    Sometimes PCI hotplug drivers need to hold a reference count on a PCI bus,
    so introduce pci_bus_{get|put}() to manage PCI bus reference count.

    Signed-off-by: Jiang Liu <liuj97@gmail.com>
    ---
    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 e2a0c52..0e18270 100644
    --- a/drivers/pci/bus.c
    +++ b/drivers/pci/bus.c
    @@ -325,6 +325,21 @@ 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 95479cd..21fa79e 100644
    --- a/include/linux/pci.h
    +++ b/include/linux/pci.h
    @@ -955,6 +955,8 @@ 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);
    --
    1.7.9.5


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