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[RFC PATCH v1 05/22] PCI: introduce pci_bus_{get|put}() to manage PCI bus reference count

 

 

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liuj97 at gmail

Aug 7, 2012, 9:10 AM

Post #1 of 1 (48 views)
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[RFC PATCH v1 05/22] PCI: introduce pci_bus_{get|put}() to manage PCI bus reference count

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 [at] gmail>
---
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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