diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 3051bb7..12fd6d9 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -943,7 +943,6 @@ static resource_size_t calculate_iosize(resource_size_t size,
 
 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)
 {
@@ -953,7 +952,7 @@ static resource_size_t calculate_memsize(resource_size_t size,
 		old_size = 0;
 	if (size < old_size)
 		size = old_size;
-	size = ALIGN(size + size1, align);
+	size = ALIGN(size, align);
 	return size;
 }
 
@@ -1216,26 +1215,23 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			 struct list_head *realloc_head)
 {
 	struct pci_dev *dev;
-	resource_size_t min_align, align, size, size0, size1;
-	resource_size_t max_align = 0;
+	resource_size_t min_align = 0, min_add_align = 0;
+	resource_size_t max_align = 0, max_add_align = 0;
+	resource_size_t size = 0, size0 = 0, size1 = 0, sum_add_size = 0;
 	struct resource *b_res = find_free_bus_resource(bus,
 					mask | IORESOURCE_PREFETCH, type);
-	resource_size_t children_add_size = 0;
-	resource_size_t children_add_align = 0;
-	resource_size_t add_align = 0;
 	LIST_HEAD(align_test_list);
+	LIST_HEAD(align_test_add_list);
 
 	if (!b_res)
 		return -ENOSPC;
 
-	size = 0;
-
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		int i;
 
 		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 			struct resource *r = &dev->resource[i];
-			resource_size_t r_size;
+			resource_size_t r_size, align;
 			int flags = pci_resource_pref_compatible(dev, r);
 
 			if (r->parent || (flags & IORESOURCE_PCI_FIXED) ||
@@ -1243,19 +1239,23 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			     (flags & mask) != type2 &&
 			     (flags & mask) != type3))
 				continue;
+
 			r_size = resource_size(r);
+			align = pci_resource_alignment(dev, r);
 #ifdef CONFIG_PCI_IOV
 			/* put SRIOV requested res to the optional list */
 			if (realloc_head && i >= PCI_IOV_RESOURCES &&
 					i <= PCI_IOV_RESOURCE_END) {
-				add_align = max(pci_resource_alignment(dev, r), add_align);
+				add_to_align_test_list(&align_test_add_list,
+							align, r_size);
 				r->end = r->start - 1;
 				add_to_list(realloc_head, dev, r, r_size, 0/* don't care */);
-				children_add_size += r_size;
+				sum_add_size += r_size;
+				if (align > max_add_align)
+					max_add_align = align;
 				continue;
 			}
 #endif
-			align = pci_resource_alignment(dev, r);
 			if (align > (1ULL<<37)) { /*128 Gb*/
 				dev_warn(&dev->dev, "disabling BAR %d: %pR (bad alignment %#llx)\n",
 					i, r, (unsigned long long) align);
@@ -1263,33 +1263,52 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 				continue;
 			}
 
-			if (r_size > 1)
+			if (r_size > 1) {
 				add_to_align_test_list(&align_test_list,
 							align, r_size);
-			size += r_size;
-			if (align > max_align)
-				max_align = align;
+				size += r_size;
+				if (align > max_align)
+					max_align = align;
+			}
 
 			if (realloc_head) {
-				children_add_size += get_res_add_size(realloc_head, r);
-				children_add_align = get_res_add_align(realloc_head, r);
-				add_align = max(add_align, children_add_align);
+				resource_size_t add_r_size, add_align;
+
+				add_r_size = get_res_add_size(realloc_head, r);
+				add_align = get_res_add_align(realloc_head, r);
+				/* no add on ? */
+				if (add_align < align)
+					add_align = align;
+				add_to_align_test_list(&align_test_add_list,
+							add_align,
+							r_size + add_r_size);
+				sum_add_size += r_size + add_r_size;
+				if (add_align > max_add_align)
+					max_add_align = add_align;
 			}
 		}
 	}
 
 	max_align = max(max_align, window_alignment(bus, b_res->flags));
-	min_align = calculate_mem_align(&align_test_list, max_align, size,
-					window_alignment(bus, b_res->flags));
-	size0 = calculate_memsize(size, min_size, 0,
+	if (size || min_size) {
+		min_align = calculate_mem_align(&align_test_list, max_align,
+				 size, window_alignment(bus, b_res->flags));
+		size0 = calculate_memsize(size, min_size,
 				  resource_size(b_res), min_align);
+	}
 	free_align_test_list(&align_test_list);
-	add_align = max(min_align, add_align);
-	if (children_add_size > add_size)
-		add_size = children_add_size;
-	size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
-		calculate_memsize(size, min_size, add_size,
-				resource_size(b_res), add_align);
+
+	if ((sum_add_size - size) < add_size)
+		sum_add_size = size + add_size;
+	if (sum_add_size > size && realloc_head) {
+		min_add_align = calculate_mem_align(&align_test_add_list,
+					max_add_align, sum_add_size,
+					window_alignment(bus, b_res->flags));
+		size1 = calculate_memsize(sum_add_size, min_size,
+				 resource_size(b_res), min_add_align);
+	}
+	free_align_test_list(&align_test_add_list);
+
 	if (!size0 && !size1) {
 		if (b_res->start || b_res->end)
 			dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
@@ -1301,11 +1320,12 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 	b_res->end = size0 + min_align - 1;
 	b_res->flags |= IORESOURCE_STARTALIGN;
 	if (size1 > size0 && realloc_head) {
-		add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align);
+		add_to_list(realloc_head, bus->self, b_res, size1 - size0,
+				min_add_align);
 		dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx add_align %llx\n",
 			   b_res, &bus->busn_res,
 			   (unsigned long long) (size1 - size0),
-			   (unsigned long long) add_align);
+			   (unsigned long long) min_add_align);
 	}
 	return 0;
 }
