diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 66cb8f4..76a7fb7 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -91,7 +91,26 @@ static void __dev_sort_resources(struct pci_dev *dev,
 	pdev_sort_resources(dev, head);
 }
 
-static void __assign_resources_sorted(struct resource_list *head,
+
+static void adjust_resources_sorted(struct resource_list *head)
+{
+	struct resource *res;
+	struct resource_list *list, *tmp;
+	int idx;
+
+	for (list = head->next; list;) {
+		res = list->res;
+		idx = res - &list->dev->resource[0];
+		if (res->add_size)
+			adjust_resource(res, res->start, 
+				resource_size(res) + res->add_size);
+		tmp = list;
+		list = list->next;
+		kfree(tmp);
+	}
+}
+
+static void assign_requested_resources_sorted(struct resource_list *head,
 				 struct resource_list_x *fail_head)
 {
 	struct resource *res;
@@ -114,14 +133,25 @@ static void __assign_resources_sorted(struct resource_list *head,
 			}
 			res->start = 0;
 			res->end = 0;
+			res->add_size = 0;
 			res->flags = 0;
 		}
 		tmp = list;
 		list = list->next;
-		kfree(tmp);
 	}
 }
 
+static void __assign_resources_sorted(struct resource_list *head,
+				 struct resource_list_x *fail_head)
+{
+	/* Satisfy the must-have resource requests */
+	assign_requested_resources_sorted(head, fail_head);
+
+	/* Try to satisfy any additional nice-to-have resource 
+		requests */
+	adjust_resources_sorted(head);
+}
+
 static void pdev_assign_resources_sorted(struct pci_dev *dev,
 				 struct resource_list_x *fail_head)
 {
@@ -404,15 +434,37 @@ static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned lon
 	return NULL;
 }
 
+static resource_size_t calculate_iosize(resource_size_t size, 
+		resource_size_t min_size, 
+		resource_size_t size1, 
+		resource_size_t old_size, 
+		resource_size_t align)
+{
+	if (size < min_size)
+		size = min_size;
+	if (old_size == 1 )
+		old_size = 0;
+	/* To be fixed in 2.5: we should have sort of HAVE_ISA
+	   flag in the struct pci_bus. */
+#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
+	size = (size & 0xff) + ((size & ~0xffUL) << 2);
+#endif
+	size = ALIGN(size + size1, align);
+	if (size < old_size)
+		size = old_size;
+	return size;
+}
+
 /* Sizing the IO windows of the PCI-PCI bridge is trivial,
    since these windows have 4K granularity and the IO ranges
    of non-bridge PCI devices are limited to 256 bytes.
    We must be careful with the ISA aliasing though. */
-static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
+static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, 
+			resource_size_t add_size)
 {
 	struct pci_dev *dev;
 	struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
-	unsigned long size = 0, size1 = 0, old_size;
+	unsigned long size = 0, size1 = 0;
 
 	if (!b_res)
  		return;
@@ -435,20 +487,16 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
 				size1 += r_size;
 		}
 	}
-	if (size < min_size)
-		size = min_size;
-	old_size = resource_size(b_res);
-	if (old_size == 1)
-		old_size = 0;
-/* To be fixed in 2.5: we should have sort of HAVE_ISA
-   flag in the struct pci_bus. */
-#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
-	size = (size & 0xff) + ((size & ~0xffUL) << 2);
-#endif
-	size = ALIGN(size + size1, 4096);
-	if (size < old_size)
-		size = old_size;
-	if (!size) {
+
+	size = calculate_iosize(size, min_size, size1, 
+			resource_size(b_res), 4096);
+	if (add_size)
+		size1 = calculate_iosize(size, min_size+add_size, size1, 
+				resource_size(b_res), 4096);
+	else
+		size1  = size;
+
+	if (!size && !size1) {
 		if (b_res->start || b_res->end)
 			dev_info(&bus->self->dev, "disabling bridge window "
 				 "%pR to [bus %02x-%02x] (unused)\n", b_res,
@@ -459,16 +507,35 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
 	/* Alignment of the IO window is always 4K */
 	b_res->start = 4096;
 	b_res->end = b_res->start + size - 1;
+	b_res->add_size = size1-size;
 	b_res->flags |= IORESOURCE_STARTALIGN;
 }
 
+
+static resource_size_t calculate_memsize(resource_size_t size, 
+		resource_size_t min_size, 
+		resource_size_t size1, 
+		resource_size_t old_size, 
+		resource_size_t align)
+{
+	if (size < min_size)
+		size = min_size;
+	if (old_size == 1 )
+		old_size = 0;
+	if (size < old_size)
+		size = old_size;
+	size = ALIGN(size + size1, align);
+	return size;
+}
+
 /* Calculate the size of the bus and minimal alignment which
    guarantees that all child resources fit in this size. */
 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
-			 unsigned long type, resource_size_t min_size)
+			 unsigned long type, resource_size_t min_size, 
+				resource_size_t add_size)
 {
 	struct pci_dev *dev;
-	resource_size_t min_align, align, size, old_size;
+	resource_size_t min_align, align, size, size1;
 	resource_size_t aligns[12];	/* Alignments from 1Mb to 2Gb */
 	int order, max_order;
 	struct resource *b_res = find_free_bus_resource(bus, type);
@@ -516,13 +583,6 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			mem64_mask &= r->flags & IORESOURCE_MEM_64;
 		}
 	}
-	if (size < min_size)
-		size = min_size;
-	old_size = resource_size(b_res);
-	if (old_size == 1)
-		old_size = 0;
-	if (size < old_size)
-		size = old_size;
 
 	align = 0;
 	min_align = 0;
@@ -537,8 +597,14 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			min_align = align1 >> 1;
 		align += aligns[order];
 	}
-	size = ALIGN(size, min_align);
-	if (!size) {
+
+	size = calculate_memsize(size, min_size, 0, resource_size(b_res), align);
+	if (add_size)
+		size1 = calculate_memsize(size, min_size+add_size, 0, resource_size(b_res), align);
+	else
+		size1  = size;
+
+	if (!size && !size1) {
 		if (b_res->start || b_res->end)
 			dev_info(&bus->self->dev, "disabling bridge window "
 				 "%pR to [bus %02x-%02x] (unused)\n", b_res,
@@ -548,8 +614,8 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 	}
 	b_res->start = min_align;
 	b_res->end = size + min_align - 1;
-	b_res->flags |= IORESOURCE_STARTALIGN;
-	b_res->flags |= mem64_mask;
+	b_res->add_size = size1 - size;
+	b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask;
 	return 1;
 }
 
@@ -606,7 +672,7 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
 {
 	struct pci_dev *dev;
 	unsigned long mask, prefmask;
-	resource_size_t min_mem_size = 0, min_io_size = 0;
+	resource_size_t additional_mem_size = 0, additional_io_size = 0;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
@@ -637,11 +703,11 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
 	case PCI_CLASS_BRIDGE_PCI:
 		pci_bridge_check_ranges(bus);
 		if (bus->self->is_hotplug_bridge) {
-			min_io_size  = pci_hotplug_io_size;
-			min_mem_size = pci_hotplug_mem_size;
+			additional_io_size  = pci_hotplug_io_size;
+			additional_mem_size = pci_hotplug_mem_size;
 		}
 	default:
-		pbus_size_io(bus, min_io_size);
+		pbus_size_io(bus, 0, additional_io_size);
 		/* If the bridge supports prefetchable range, size it
 		   separately. If it doesn't, or its prefetchable window
 		   has already been allocated by arch code, try
@@ -649,11 +715,11 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus)
 		   resources. */
 		mask = IORESOURCE_MEM;
 		prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
-		if (pbus_size_mem(bus, prefmask, prefmask, min_mem_size))
+		if (pbus_size_mem(bus, prefmask, prefmask, 0, additional_mem_size))
 			mask = prefmask; /* Success, size non-prefetch only. */
 		else
-			min_mem_size += min_mem_size;
-		pbus_size_mem(bus, mask, IORESOURCE_MEM, min_mem_size);
+			additional_mem_size += additional_mem_size;
+		pbus_size_mem(bus, mask, IORESOURCE_MEM, 0, additional_mem_size);
 		break;
 	}
 }
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index e9bb22c..d00c61c 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -18,6 +18,7 @@
 struct resource {
 	resource_size_t start;
 	resource_size_t end;
+	resource_size_t add_size;
 	const char *name;
 	unsigned long flags;
 	struct resource *parent, *sibling, *child;
