1 files changed, 46 insertions, 0 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index e75d219fd107..712250f5874a 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -17,6 +17,52 @@
 
 #include "pci.h"
 
+void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
+                          unsigned int flags)
+{
+        struct pci_bus_resource *bus_res;
+
+        bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
+        if (!bus_res) {
+                dev_err(&bus->dev, "can't add %pR resource\n", res);
+                return;
+        }
+
+        bus_res->res = res;
+        bus_res->flags = flags;
+        list_add_tail(&bus_res->list, &bus->resources);
+}
+
+struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
+{
+        struct pci_bus_resource *bus_res;
+
+        if (n < PCI_BRIDGE_RESOURCE_NUM)
+                return bus->resource[n];
+
+        n -= PCI_BRIDGE_RESOURCE_NUM;
+        list_for_each_entry(bus_res, &bus->resources, list) {
+                if (n-- == 0)
+                        return bus_res->res;
+        }
+        return NULL;
+}
+EXPORT_SYMBOL_GPL(pci_bus_resource_n);
+
+void pci_bus_remove_resources(struct pci_bus *bus)
+{
+        struct pci_bus_resource *bus_res, *tmp;
+        int i;
+
+        for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
+                bus->resource[i] = 0;
+
+        list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
+                list_del(&bus_res->list);
+                kfree(bus_res);
+        }
+}
+
 /**
  * pci_bus_alloc_resource - allocate a resource from a parent bus
  * @bus: PCI bus