Add pci_find_bus_resource() to return bus resource for input resource.

In some case, we may only have bus instead of dev.
It is same as pci_find_parent_resource, but take bus as input.

Signed-off-by: Yinghai Lu <ying...@kernel.org>
---
 drivers/pci/pci.c   | 27 ++++++++++++++++-----------
 include/linux/pci.h |  2 ++
 2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index aab9d51..6dfecdd 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -436,18 +436,9 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
 }
 EXPORT_SYMBOL_GPL(pci_find_ht_capability);
 
-/**
- * pci_find_parent_resource - return resource region of parent bus of given 
region
- * @dev: PCI device structure contains resources to be searched
- * @res: child resource record for which parent is sought
- *
- *  For given resource region of given device, return the resource
- *  region of parent bus the given region is contained in.
- */
-struct resource *pci_find_parent_resource(const struct pci_dev *dev,
-                                         struct resource *res)
+struct resource *pci_find_bus_resource(const struct pci_bus *bus,
+                                       struct resource *res)
 {
-       const struct pci_bus *bus = dev->bus;
        struct resource *r;
        int i;
 
@@ -477,6 +468,20 @@ struct resource *pci_find_parent_resource(const struct 
pci_dev *dev,
        }
        return NULL;
 }
+
+/**
+ * pci_find_parent_resource - return resource region of parent bus of given 
region
+ * @dev: PCI device structure contains resources to be searched
+ * @res: child resource record for which parent is sought
+ *
+ *  For given resource region of given device, return the resource
+ *  region of parent bus the given region is contained in.
+ */
+struct resource *pci_find_parent_resource(const struct pci_dev *dev,
+                                         struct resource *res)
+{
+       return pci_find_bus_resource(dev->bus, res);
+}
 EXPORT_SYMBOL(pci_find_parent_resource);
 
 /**
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0ab8359..c1c1def 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -802,6 +802,8 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct 
pci_bus_region *region,
                             struct resource *res);
 void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
                             struct pci_bus_region *region);
+struct resource *pci_find_bus_resource(const struct pci_bus *bus,
+                                       struct resource *res);
 void pcibios_scan_specific_bus(int busn);
 struct pci_bus *pci_find_bus(int domain, int busnr);
 void pci_bus_add_devices(const struct pci_bus *bus);
-- 
2.8.3

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