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[PATCH 02/13] PCI: Add pci_find_bus_resource()

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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 <yinghai@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 4ffa152..deb828f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -437,18 +437,9 @@ 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;
 
@@ -478,6 +469,20 @@ 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 88185ff..817786b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -836,6 +836,8 @@ 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);
-- 
2.9.3

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[PATCH 00/13] PCI: sparc related 64bit resource fixup Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 11/13] PCI: Add has_mem64 for struct host_bridge Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 12/13] PCI: Only treat non-pref mmio64 as pref if host bridge has mmio64 Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 05/13] sparc/PCI: Keep resource idx order with bridge register number Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 09/13] PCI: Check pref compatible bit for mem64 resource of PCIe device Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 06/13] powerpc/PCI: Keep resource idx order with bridge register number Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 07/13] powerpc/PCI: Add IORESOURCE_MEM_64 for 64-bit resource in OF parsing Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 02/13] PCI: Add pci_find_bus_resource() Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 10/13] PCI: Only treat non-pref mmio64 as pref if all bridges have MEM_64 Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 01/13] sparc/PCI: Use correct offset for bus address to resource Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 03/13] sparc/PCI: Reserve legacy mmio after PCI mmio Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200
  [PATCH 13/13] PCI: Restore pref MMIO allocation logic for host bridge without mmio64 Yinghai Lu <yinghai@kernel.org> - 2017-04-21 07:10 +0200

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