PCI: add helpers for building PCI bus resource lists

We'd like to supply a list of resources when we create a new PCI bus,
e.g., the root bus under a PCI host bridge.  These are helpers for
constructing that list.

These are exported because the plan is to replace this exported interface:
    pci_scan_bus_parented()
with this one:
    pci_add_resource(resources, ...)
    pci_scan_root_bus(..., resources)

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 27 insertions, 5 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 1e2ad92a4752..398f5d859791 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -18,6 +18,32 @@
 
 #include "pci.h"
 
+void pci_add_resource(struct list_head *resources, struct resource *res)
+{
+        struct pci_bus_resource *bus_res;
+
+        bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
+        if (!bus_res) {
+                printk(KERN_ERR "PCI: can't add bus resource %pR\n", res);
+                return;
+        }
+
+        bus_res->res = res;
+        list_add_tail(&bus_res->list, resources);
+}
+EXPORT_SYMBOL(pci_add_resource);
+
+void pci_free_resource_list(struct list_head *resources)
+{
+        struct pci_bus_resource *bus_res, *tmp;
+
+        list_for_each_entry_safe(bus_res, tmp, resources, list) {
+                list_del(&bus_res->list);
+                kfree(bus_res);
+        }
+}
+EXPORT_SYMBOL(pci_free_resource_list);
+
 void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
                           unsigned int flags)
 {
@@ -52,16 +78,12 @@ 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] = NULL;
 
-        list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
-                list_del(&bus_res->list);
-                kfree(bus_res);
-        }
+        pci_free_resource_list(&bus->resources);
 }
 
 /**