[PATCH v2 6/6] ACPI, PCI: add resoruce-assign code for devices under hot-added hostbridge

[Taku Izumi <izumi.taku@jp.fujitsu.com>]

Devices under hot-added hostbridge have no chance to assign resources
and to configure them, so this patch adds such code for hot-added 
hostbridges at acpi_pci_root_start().

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
---
 drivers/acpi/pci_root.c |   17 +++++++++++++++++
 include/acpi/acpi_bus.h |    1 +
 2 files changed, 18 insertions(+)

Index: Bjorn-next-0903/drivers/acpi/pci_root.c
===================================================================
--- Bjorn-next-0903.orig/drivers/acpi/pci_root.c
+++ Bjorn-next-0903/drivers/acpi/pci_root.c
@@ -39,6 +39,7 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/apei.h>
+#include <linux/pci_hotplug.h>
 
 #define PREFIX "ACPI: "
 
@@ -461,6 +462,9 @@ static int __devinit acpi_pci_root_add(s
 	if (!root)
 		return -ENOMEM;
 
+	if (system_state != SYSTEM_BOOTING)
+		root->hot_added = true;
+
 	segment = 0;
 	status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL,
 				       &segment);
@@ -639,6 +643,7 @@ static int acpi_pci_root_start(struct ac
 {
 	struct acpi_pci_root *root = acpi_driver_data(device);
 	struct acpi_pci_driver *driver;
+	struct pci_dev *pdev;
 
 	mutex_lock(&acpi_pci_root_lock);
 	list_for_each_entry(driver, &acpi_pci_drivers, node)
@@ -646,6 +651,18 @@ static int acpi_pci_root_start(struct ac
 			driver->add(device->handle);
 	mutex_unlock(&acpi_pci_root_lock);
 
+	/*
+	 * Devices under hot-added hostbridge have no chance to assign
+	 * resources and to configure them, so do that here
+	 */
+	if (root->hot_added) {
+		pci_bus_size_bridges(root->bus);
+		pci_bus_assign_resources(root->bus);
+		list_for_each_entry(pdev, &root->bus->devices, bus_list)
+			pci_configure_slot(pdev);
+		pci_enable_bridges(root->bus);
+	}
+
 	pci_bus_add_devices(root->bus);
 
 	return 0;
Index: Bjorn-next-0903/include/acpi/acpi_bus.h
===================================================================
--- Bjorn-next-0903.orig/include/acpi/acpi_bus.h
+++ Bjorn-next-0903/include/acpi/acpi_bus.h
@@ -407,6 +407,7 @@ struct acpi_pci_root {
 	u32 osc_support_set;	/* _OSC state of support bits */
 	u32 osc_control_set;	/* _OSC state of control bits */
 	phys_addr_t mcfg_addr;
+	bool hot_added;
 };
 
 /* helper */