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Commit fe830ef6 authored by Jiang Liu's avatar Jiang Liu Committed by Bjorn Helgaas
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PCI: Introduce pci_bus_{get|put}() to manage PCI bus reference count 



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

Signed-off-by: default avatarJiang Liu <jiang.liu@huawei.com>
Signed-off-by: default avatarYijing Wang <wangyijing@huawei.com>
Signed-off-by: default avatarGu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent f722406f

drivers/pci/bus.c

+15 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/pci.h

+2 −0
Original line number Diff line number Diff line
@@ -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);