[PATCH 4/9] pci: add failed_list to record failed one for pci_bus_assign_resources

[Yinghai Lu <yinghai@xxxxxxxxxx>]

so later we can do sth with those failed one

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>

---
 drivers/pci/setup-bus.c |   70 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 63 insertions(+), 7 deletions(-)

Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -27,7 +27,49 @@
 #include <linux/slab.h>
 #include "pci.h"
 
-static void pbus_assign_resources_sorted(const struct pci_bus *bus)
+
+static void add_to_failed_list(struct resource_list *head, struct pci_dev *dev,
+				 struct resource *res)
+{
+	struct resource_list *list = head;
+	struct resource_list *ln = list->next;
+	struct resource_list *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;
+	list->next = tmp;
+}
+
+static void free_failed_list(struct resource_list *head)
+{
+	struct resource_list *list, *tmp;
+	struct resource *res;
+	/*
+	 * Try to release leaf bridge's resources that there is no child
+	 * under it
+	 */
+	for (list = head->next; list;) {
+		res = list->res;
+		res->start = 0;
+		res->end = 0;
+		res->flags = 0;
+		tmp = list;
+		list = list->next;
+		kfree(tmp);
+	}
+
+	head->next = NULL;
+}
+
+static void pbus_assign_resources_sorted(const struct pci_bus *bus,
+					 struct resource_list *fail_head)
 {
 	struct pci_dev *dev;
 	struct resource *res;
@@ -58,9 +100,17 @@ static void pbus_assign_resources_sorted
 		res = list->res;
 		idx = res - &list->dev->resource[0];
 		if (pci_assign_resource(list->dev, idx)) {
-			res->start = 0;
-			res->end = 0;
-			res->flags = 0;
+			if (fail_head && !pci_is_root_bus(list->dev->bus)) {
+				/*
+				 * device need to keep flags and size
+				 * for next try
+				 */
+				add_to_failed_list(fail_head, list->dev, res);
+			} else {
+				res->start = 0;
+				res->end = 0;
+				res->flags = 0;
+			}
 		}
 		tmp = list;
 		list = list->next;
@@ -577,19 +627,20 @@ void __ref pci_bus_size_bridges(struct p
 }
 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 *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:
@@ -607,6 +658,11 @@ void __ref pci_bus_assign_resources(cons
 		}
 	}
 }
+
+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 release_children_resource(struct resource *r)

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