Subject: [PATCH] PCI: pcibus address to resource converting take bus instead of dev

For allocating resource under bus path, we do not have dev to pass along,
and we only have bus to use instead.

-v2: drop pcibios_bus_addr_to_resource().

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 drivers/pci/host-bridge.c |   34 +++++++++++++++++++++-------------
 include/linux/pci.h       |    5 +++++
 2 files changed, 26 insertions(+), 13 deletions(-)

Index: linux-2.6/drivers/pci/host-bridge.c
===================================================================
--- linux-2.6.orig/drivers/pci/host-bridge.c
+++ linux-2.6/drivers/pci/host-bridge.c
@@ -9,22 +9,19 @@
 
 #include "pci.h"
 
-static struct pci_bus *find_pci_root_bus(struct pci_dev *dev)
+static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
 {
-	struct pci_bus *bus;
-
-	bus = dev->bus;
 	while (bus->parent)
 		bus = bus->parent;
 
 	return bus;
 }
 
-static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev)
+static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
 {
-	struct pci_bus *bus = find_pci_root_bus(dev);
+	struct pci_bus *root_bus = find_pci_root_bus(bus);
 
-	return to_pci_host_bridge(bus->bridge);
+	return to_pci_host_bridge(root_bus->bridge);
 }
 
 void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
@@ -40,10 +37,11 @@ static bool resource_contains(struct res
 	return res1->start <= res2->start && res1->end >= res2->end;
 }
 
-void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
-			     struct resource *res)
+void __pcibios_resource_to_bus(struct pci_bus *bus,
+				      struct pci_bus_region *region,
+				      struct resource *res)
 {
-	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
+	struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
 	struct pci_host_bridge_window *window;
 	resource_size_t offset = 0;
 
@@ -60,6 +58,11 @@ void pcibios_resource_to_bus(struct pci_
 	region->start = res->start - offset;
 	region->end = res->end - offset;
 }
+void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+			     struct resource *res)
+{
+	__pcibios_resource_to_bus(dev->bus, region, res);
+}
 EXPORT_SYMBOL(pcibios_resource_to_bus);
 
 static bool region_contains(struct pci_bus_region *region1,
@@ -68,10 +71,10 @@ static bool region_contains(struct pci_b
 	return region1->start <= region2->start && region1->end >= region2->end;
 }
 
-void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
-			     struct pci_bus_region *region)
+void __pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
+				      struct pci_bus_region *region)
 {
-	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
+	struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
 	struct pci_host_bridge_window *window;
 	resource_size_t offset = 0;
 
@@ -93,4 +96,9 @@ void pcibios_bus_to_resource(struct pci_
 	res->start = region->start + offset;
 	res->end = region->end + offset;
 }
+void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
+			     struct pci_bus_region *region)
+{
+	__pcibios_bus_to_resource(dev->bus, res, region);
+}
 EXPORT_SYMBOL(pcibios_bus_to_resource);
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -738,8 +738,13 @@ void pci_fixup_cardbus(struct pci_bus *)
 
 /* Generic PCI functions used internally */
 
+void __pcibios_resource_to_bus(struct pci_bus *bus,
+			       struct pci_bus_region *region,
+			       struct resource *res);
 void pcibios_resource_to_bus(struct pci_dev *dev, 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);
 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 			     struct pci_bus_region *region);
 void pcibios_scan_specific_bus(int busn);