PCI: add failed_list to pci_bus_assign_resources

This allows us to track failed allocations for later re-trying with
reallocation.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Reviewed-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 7371a54..7e87ea8 100644 (file)
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -27,7 +27,52 @@
 #include <linux/slab.h>
 #include "pci.h"
 
-static void pbus_assign_resources_sorted(const struct pci_bus *bus)
+struct resource_list_x {
+       struct resource_list_x *next;
+       struct resource *res;
+       struct pci_dev *dev;
+       resource_size_t start;
+       resource_size_t end;
+       unsigned long flags;
+};
+
+static void add_to_failed_list(struct resource_list_x *head,
+                                struct pci_dev *dev, struct resource *res)
+{
+       struct resource_list_x *list = head;
+       struct resource_list_x *ln = list->next;
+       struct resource_list_x *tmp;
+
+       tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+       if (!tmp) {
+               pr_warning("add_to_failed_list: kmalloc() failed!\n");
+               return;
+       }
+
+       tmp->next = ln;
+       tmp->res = res;
+       tmp->dev = dev;
+       tmp->start = res->start;
+       tmp->end = res->end;
+       tmp->flags = res->flags;
+       list->next = tmp;
+}
+
+static void free_failed_list(struct resource_list_x *head)
+{
+       struct resource_list_x *list, *tmp;
+
+       for (list = head->next; list;) {
+               tmp = list;
+               list = list->next;
+               kfree(tmp);
+       }
+
+       head->next = NULL;
+}
+
+static void pbus_assign_resources_sorted(const struct pci_bus *bus,
+                                        struct resource_list_x *fail_head)
 {
        struct pci_dev *dev;
        struct resource *res;
@@ -58,6 +103,8 @@ static void pbus_assign_resources_sorted(const struct pci_bus *bus)
                res = list->res;
                idx = res - &list->dev->resource[0];
                if (pci_assign_resource(list->dev, idx)) {
+                       if (fail_head && !pci_is_root_bus(list->dev->bus))
+                               add_to_failed_list(fail_head, list->dev, res);
                        res->start = 0;
                        res->end = 0;
                        res->flags = 0;
@@ -572,19 +619,20 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
 }
 EXPORT_SYMBOL(pci_bus_size_bridges);
 
-void __ref pci_bus_assign_resources(const struct pci_bus *bus)
+static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
+                                        struct resource_list_x *fail_head)
 {
        struct pci_bus *b;
        struct pci_dev *dev;
 
-       pbus_assign_resources_sorted(bus);
+       pbus_assign_resources_sorted(bus, fail_head);
 
        list_for_each_entry(dev, &bus->devices, bus_list) {
                b = dev->subordinate;
                if (!b)
                        continue;
 
-               pci_bus_assign_resources(b);
+               __pci_bus_assign_resources(b, fail_head);
 
                switch (dev->class >> 8) {
                case PCI_CLASS_BRIDGE_PCI:
@@ -602,6 +650,11 @@ void __ref pci_bus_assign_resources(const struct pci_bus *bus)
                }
        }
 }
+
+void __ref pci_bus_assign_resources(const struct pci_bus *bus)
+{
+       __pci_bus_assign_resources(bus, NULL);
+}
 EXPORT_SYMBOL(pci_bus_assign_resources);
 
 static void pci_bridge_release_resources(struct pci_bus *bus,