--- zzzz-none-000/linux-3.10.107/arch/mn10300/unit-asb2305/pci.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/mn10300/unit-asb2305/pci.c	2021-02-04 17:41:59.000000000 +0000
@@ -24,7 +24,6 @@
 
 unsigned int pci_probe = 1;
 
-int pcibios_last_bus = -1;
 struct pci_ops *pci_root_ops;
 
 /*
@@ -229,8 +228,8 @@
 }
 
 static struct pci_ops pci_direct_ampci = {
-	pci_ampci_read_config,
-	pci_ampci_write_config,
+	.read = pci_ampci_read_config,
+	.write = pci_ampci_write_config,
 };
 
 /*
@@ -282,42 +281,37 @@
 	return -ENODEV;
 }
 
-static int is_valid_resource(struct pci_dev *dev, int idx)
+static void pcibios_fixup_device_resources(struct pci_dev *dev)
 {
-	unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
-	struct resource *devr = &dev->resource[idx], *busr;
+	int idx;
 
-	if (dev->bus) {
-		pci_bus_for_each_resource(dev->bus, busr, i) {
-			if (!busr || (busr->flags ^ devr->flags) & type_mask)
-				continue;
-
-			if (devr->start &&
-			    devr->start >= busr->start &&
-			    devr->end <= busr->end)
-				return 1;
-		}
-	}
+	if (!dev->bus)
+		return;
 
-	return 0;
+	for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) {
+		struct resource *r = &dev->resource[idx];
+
+		if (!r->flags || r->parent || !r->start)
+			continue;
+
+		pci_claim_resource(dev, idx);
+	}
 }
 
-static void pcibios_fixup_device_resources(struct pci_dev *dev)
+static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
 {
-	int limit, i;
+	int idx;
 
-	if (dev->bus->number != 0)
+	if (!dev->bus)
 		return;
 
-	limit = (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) ?
-		PCI_BRIDGE_RESOURCES : PCI_NUM_RESOURCES;
+	for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
+		struct resource *r = &dev->resource[idx];
 
-	for (i = 0; i < limit; i++) {
-		if (!dev->resource[i].flags)
+		if (!r->flags || r->parent || !r->start)
 			continue;
 
-		if (is_valid_resource(dev, i))
-			pci_claim_resource(dev, i);
+		pci_claim_bridge_resource(dev, idx);
 	}
 }
 
@@ -331,7 +325,7 @@
 
 	if (bus->self) {
 		pci_read_bridge_bases(bus);
-		pcibios_fixup_device_resources(bus->self);
+		pcibios_fixup_bridge_resources(bus->self);
 	}
 
 	list_for_each_entry(dev, &bus->devices, bus_list)
@@ -348,6 +342,7 @@
 {
 	resource_size_t io_offset, mem_offset;
 	LIST_HEAD(resources);
+	struct pci_bus *bus;
 
 	ioport_resource.start	= 0xA0000000;
 	ioport_resource.end	= 0xDFFFFFFF;
@@ -377,11 +372,14 @@
 
 	pci_add_resource_offset(&resources, &pci_ioport_resource, io_offset);
 	pci_add_resource_offset(&resources, &pci_iomem_resource, mem_offset);
-	pci_scan_root_bus(NULL, 0, &pci_direct_ampci, NULL, &resources);
+	bus = pci_scan_root_bus(NULL, 0, &pci_direct_ampci, NULL, &resources);
+	if (!bus)
+		return 0;
 
 	pcibios_irq_init();
 	pcibios_fixup_irqs();
 	pcibios_resource_survey();
+	pci_bus_add_devices(bus);
 	return 0;
 }
 
@@ -392,10 +390,6 @@
 	if (!strcmp(str, "off")) {
 		pci_probe = 0;
 		return NULL;
-
-	} else if (!strncmp(str, "lastbus=", 8)) {
-		pcibios_last_bus = simple_strtol(str+8, NULL, 0);
-		return NULL;
 	}
 
 	return str;