Merge branch 'acpi-cleanup'

* acpi-cleanup: (21 commits)
  ACPI / hotplug: Fix concurrency issues and memory leaks
  ACPI: Remove the use of CONFIG_ACPI_CONTAINER_MODULE
  ACPI / scan: Full transition to D3cold in acpi_device_unregister()
  ACPI / scan: Make acpi_bus_hot_remove_device() acquire the scan lock
  ACPI: Drop the container.h header file
  ACPI / Documentation: refer to correct file for acpi_platform_device_ids[] table
  ACPI / scan: Make container driver use struct acpi_scan_handler
  ACPI / scan: Remove useless #ifndef from acpi_eject_store()
  ACPI: Unbind ACPI drv when probe failed
  ACPI: sysfs eject support for ACPI scan handlers
  ACPI / scan: Follow priorities of IDs when matching scan handlers
  ACPI / PCI: pci_slot: replace printk(KERN_xxx) with pr_xxx()
  ACPI / dock: Fix acpi_bus_get_device() check in drivers/acpi/dock.c
  ACPI / scan: Clean up acpi_bus_get_parent()
  ACPI / platform: Use struct acpi_scan_handler for creating devices
  ACPI / PCI: Make PCI IRQ link driver use struct acpi_scan_handler
  ACPI / PCI: Make PCI root driver use struct acpi_scan_handler
  ACPI / scan: Introduce struct acpi_scan_handler
  ACPI / scan: Make scanning of fixed devices follow the general scheme
  ACPI: Drop device start operation that is not used
  ...

22 files changed, 390 insertions, 365 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 38c5078..78105b3 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -337,7 +337,7 @@ config X86_PM_TIMER
 	  systems require this timer. 
 
 config ACPI_CONTAINER
-	tristate "Container and Module Devices (EXPERIMENTAL)"
+	bool "Container and Module Devices (EXPERIMENTAL)"
 	depends on EXPERIMENTAL
 	default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
 	help
diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index d5fdd36..6d5bf64 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -60,7 +60,7 @@ static int acpi_ac_open_fs(struct inode *inode, struct file *file);
 #endif
 
 static int acpi_ac_add(struct acpi_device *device);
-static int acpi_ac_remove(struct acpi_device *device, int type);
+static int acpi_ac_remove(struct acpi_device *device);
 static void acpi_ac_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id ac_device_ids[] = {
@@ -337,7 +337,7 @@ static int acpi_ac_resume(struct device *dev)
 }
 #endif
 
-static int acpi_ac_remove(struct acpi_device *device, int type)
+static int acpi_ac_remove(struct acpi_device *device)
 {
 	struct acpi_ac *ac = NULL;
 
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 03d18f2..034d3e7 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -54,7 +54,7 @@ MODULE_LICENSE("GPL");
 #define MEMORY_POWER_OFF_STATE	2
 
 static int acpi_memory_device_add(struct acpi_device *device);
-static int acpi_memory_device_remove(struct acpi_device *device, int type);
+static int acpi_memory_device_remove(struct acpi_device *device);
 
 static const struct acpi_device_id memory_device_ids[] = {
 	{ACPI_MEMORY_DEVICE_HID, 0},
@@ -153,14 +153,16 @@ acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
 	return 0;
 }
 
-static int
-acpi_memory_get_device(acpi_handle handle,
-		       struct acpi_memory_device **mem_device)
+static int acpi_memory_get_device(acpi_handle handle,
+				  struct acpi_memory_device **mem_device)
 {
 	struct acpi_device *device = NULL;
-	int result;
+	int result = 0;
 
-	if (!acpi_bus_get_device(handle, &device) && device)
+	acpi_scan_lock_acquire();
+
+	acpi_bus_get_device(handle, &device);
+	if (device)
 		goto end;
 
 	/*
@@ -169,23 +171,28 @@ acpi_memory_get_device(acpi_handle handle,
 	 */
 	result = acpi_bus_scan(handle);
 	if (result) {
-		acpi_handle_warn(handle, "Cannot add acpi bus\n");
-		return -EINVAL;
+		acpi_handle_warn(handle, "ACPI namespace scan failed\n");
+		result = -EINVAL;
+		goto out;
 	}
 	result = acpi_bus_get_device(handle, &device);
 	if (result) {
 		acpi_handle_warn(handle, "Missing device object\n");
-		return -EINVAL;
+		result = -EINVAL;
+		goto out;
 	}
 
-      end:
+ end:
 	*mem_device = acpi_driver_data(device);
 	if (!(*mem_device)) {
 		dev_err(&device->dev, "driver data not found\n");
-		return -ENODEV;
+		result = -ENODEV;
+		goto out;
 	}
 
-	return 0;
+ out:
+	acpi_scan_lock_release();
+	return result;
 }
 
 static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
@@ -305,6 +312,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
 	struct acpi_device *device;
 	struct acpi_eject_event *ej_event = NULL;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
+	acpi_status status;
 
 	switch (event) {
 	case ACPI_NOTIFY_BUS_CHECK:
@@ -327,29 +335,40 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "\nReceived EJECT REQUEST notification for device\n"));
 
+		status = AE_ERROR;
+		acpi_scan_lock_acquire();
+
 		if (acpi_bus_get_device(handle, &device)) {
 			acpi_handle_err(handle, "Device doesn't exist\n");
-			break;
+			goto unlock;
 		}
 		mem_device = acpi_driver_data(device);
 		if (!mem_device) {
 			acpi_handle_err(handle, "Driver Data is NULL\n");
-			break;
+			goto unlock;
 		}
 
 		ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 		if (!ej_event) {
 			pr_err(PREFIX "No memory, dropping EJECT\n");
-			break;
+			goto unlock;
 		}
 
+		get_device(&device->dev);
 		ej_event->device = device;
 		ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
-		acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
-					(void *)ej_event);
+		/* The eject is carried out asynchronously. */
+		status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
+						 ej_event);
+		if (ACPI_FAILURE(status)) {
+			put_device(&device->dev);
+			kfree(ej_event);
+		}
 
-		/* eject is performed asynchronously */
-		return;
+ unlock:
+		acpi_scan_lock_release();
+		if (ACPI_SUCCESS(status))
+			return;
 	default:
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Unsupported event [0x%x]\n", event));
@@ -360,7 +379,6 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
 
 	/* Inform firmware that the hotplug operation has completed */
 	(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
-	return;
 }
 
 static void acpi_memory_device_free(struct acpi_memory_device *mem_device)
@@ -415,7 +433,7 @@ static int acpi_memory_device_add(struct acpi_device *device)
 	return result;
 }
 
-static int acpi_memory_device_remove(struct acpi_device *device, int type)
+static int acpi_memory_device_remove(struct acpi_device *device)
 {
 	struct acpi_memory_device *mem_device = NULL;
 	int result;
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 16fa979..31de104 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -482,8 +482,7 @@ static int acpi_pad_add(struct acpi_device *device)
 	return 0;
 }
 
-static int acpi_pad_remove(struct acpi_device *device,
-	int type)
+static int acpi_pad_remove(struct acpi_device *device)
 {
 	mutex_lock(&isolated_cpus_lock);
 	acpi_pad_idle_cpus(0);
diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
index 2d1fb4c..26fce4b 100644
--- a/drivers/acpi/acpi_platform.c
+++ b/drivers/acpi/acpi_platform.c
@@ -22,6 +22,30 @@
 
 ACPI_MODULE_NAME("platform");
 
+/* Flags for acpi_create_platform_device */
+#define ACPI_PLATFORM_CLK	BIT(0)
+
+/*
+ * The following ACPI IDs are known to be suitable for representing as
+ * platform devices.
+ */
+static const struct acpi_device_id acpi_platform_device_ids[] = {
+
+	{ "PNP0D40" },
+
+	/* Haswell LPSS devices */
+	{ "INT33C0", ACPI_PLATFORM_CLK },
+	{ "INT33C1", ACPI_PLATFORM_CLK },
+	{ "INT33C2", ACPI_PLATFORM_CLK },
+	{ "INT33C3", ACPI_PLATFORM_CLK },
+	{ "INT33C4", ACPI_PLATFORM_CLK },
+	{ "INT33C5", ACPI_PLATFORM_CLK },
+	{ "INT33C6", ACPI_PLATFORM_CLK },
+	{ "INT33C7", ACPI_PLATFORM_CLK },
+
+	{ }
+};
+
 static int acpi_create_platform_clks(struct acpi_device *adev)
 {
 	static struct platform_device *pdev;
@@ -39,8 +63,7 @@ static int acpi_create_platform_clks(struct acpi_device *adev)
 /**
  * acpi_create_platform_device - Create platform device for ACPI device node
  * @adev: ACPI device node to create a platform device for.
- * @flags: ACPI_PLATFORM_* flags that affect the creation of the platform
- *	   devices.
+ * @id: ACPI device ID used to match @adev.
  *
  * Check if the given @adev can be represented as a platform device and, if
  * that's the case, create and register a platform device, populate its common
@@ -48,9 +71,10 @@ static int acpi_create_platform_clks(struct acpi_device *adev)
  *
  * Name of the platform device will be the same as @adev's.
  */
-struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
-						    unsigned long flags)
+static int acpi_create_platform_device(struct acpi_device *adev,
+				       const struct acpi_device_id *id)
 {
+	unsigned long flags = id->driver_data;
 	struct platform_device *pdev = NULL;
 	struct acpi_device *acpi_parent;
 	struct platform_device_info pdevinfo;
@@ -59,25 +83,28 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
 	struct resource *resources;
 	int count;
 
-	if ((flags & ACPI_PLATFORM_CLK) && acpi_create_platform_clks(adev)) {
-		dev_err(&adev->dev, "failed to create clocks\n");
-		return NULL;
+	if (flags & ACPI_PLATFORM_CLK) {
+		int ret = acpi_create_platform_clks(adev);
+		if (ret) {
+			dev_err(&adev->dev, "failed to create clocks\n");
+			return ret;
+		}
 	}
 
 	/* If the ACPI node already has a physical device attached, skip it. */
 	if (adev->physical_node_count)
-		return NULL;
+		return 0;
 
 	INIT_LIST_HEAD(&resource_list);
 	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
 	if (count <= 0)
-		return NULL;
+		return 0;
 
 	resources = kmalloc(count * sizeof(struct resource), GFP_KERNEL);
 	if (!resources) {
 		dev_err(&adev->dev, "No memory for resources\n");
 		acpi_dev_free_resource_list(&resource_list);
-		return NULL;
+		return -ENOMEM;
 	}
 	count = 0;
 	list_for_each_entry(rentry, &resource_list, node)
@@ -123,5 +150,15 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
 	}
 
 	kfree(resources);
-	return pdev;
+	return 1;
+}
+
+static struct acpi_scan_handler platform_handler = {
+	.ids = acpi_platform_device_ids,
+	.attach = acpi_create_platform_device,
+};
+
+void __init acpi_platform_init(void)
+{
+	acpi_scan_add_handler(&platform_handler);
 }
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 7efaeaa..c5cd5b5 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -1111,7 +1111,7 @@ fail:
 	return result;
 }
 
-static int acpi_battery_remove(struct acpi_device *device, int type)
+static int acpi_battery_remove(struct acpi_device *device)
 {
 	struct acpi_battery *battery = NULL;
 
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index f0d936b..86c7d54 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -75,7 +75,7 @@ static const struct acpi_device_id button_device_ids[] = {
 MODULE_DEVICE_TABLE(acpi, button_device_ids);
 
 static int acpi_button_add(struct acpi_device *device);
-static int acpi_button_remove(struct acpi_device *device, int type);
+static int acpi_button_remove(struct acpi_device *device);
 static void acpi_button_notify(struct acpi_device *device, u32 event);
 
 #ifdef CONFIG_PM_SLEEP
@@ -433,7 +433,7 @@ static int acpi_button_add(struct acpi_device *device)
 	return error;
 }
 
-static int acpi_button_remove(struct acpi_device *device, int type)
+static int acpi_button_remove(struct acpi_device *device)
 {
 	struct acpi_button *button = acpi_driver_data(device);
 
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index cc79d3e..5523ba7 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -34,46 +34,34 @@
 #include <linux/acpi.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
-#include <acpi/container.h>
 
 #define PREFIX "ACPI: "
 
-#define ACPI_CONTAINER_DEVICE_NAME	"ACPI container device"
-#define ACPI_CONTAINER_CLASS		"container"
-
-#define INSTALL_NOTIFY_HANDLER		1
-#define UNINSTALL_NOTIFY_HANDLER	2
-
 #define _COMPONENT			ACPI_CONTAINER_COMPONENT
 ACPI_MODULE_NAME("container");
 
-MODULE_AUTHOR("Anil S Keshavamurthy");
-MODULE_DESCRIPTION("ACPI container driver");
-MODULE_LICENSE("GPL");
-
-static int acpi_container_add(struct acpi_device *device);
-static int acpi_container_remove(struct acpi_device *device, int type);
-
 static const struct acpi_device_id container_device_ids[] = {
 	{"ACPI0004", 0},
 	{"PNP0A05", 0},
 	{"PNP0A06", 0},
 	{"", 0},
 };
-MODULE_DEVICE_TABLE(acpi, container_device_ids);
 
-static struct acpi_driver acpi_container_driver = {
-	.name = "container",
-	.class = ACPI_CONTAINER_CLASS,
+static int container_device_attach(struct acpi_device *device,
+				   const struct acpi_device_id *not_used)
+{
+	/*
+	 * FIXME: This is necessary, so that acpi_eject_store() doesn't return
+	 * -ENODEV for containers.
+	 */
+	return 1;
+}
+
+static struct acpi_scan_handler container_device_handler = {
 	.ids = container_device_ids,
-	.ops = {
-		.add = acpi_container_add,
-		.remove = acpi_container_remove,
-		},
+	.attach = container_device_attach,
 };
 
-/*******************************************************************/
-
 static int is_device_present(acpi_handle handle)
 {
 	acpi_handle temp;
@@ -92,49 +80,6 @@ static int is_device_present(acpi_handle handle)
 	return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
 }
 
-static bool is_container_device(const char *hid)
-{
-	const struct acpi_device_id *container_id;
-
-	for (container_id = container_device_ids;
-	     container_id->id[0]; container_id++) {
-		if (!strcmp((char *)container_id->id, hid))
-			return true;
-	}
-
-	return false;
-}
-
-/*******************************************************************/
-static int acpi_container_add(struct acpi_device *device)
-{
-	struct acpi_container *container;
-
-	container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
-	if (!container)
-		return -ENOMEM;
-
-	container->handle = device->handle;
-	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
-	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
-	device->driver_data = container;
-
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
-			  acpi_device_name(device), acpi_device_bid(device)));
-
-	return 0;
-}
-
-static int acpi_container_remove(struct acpi_device *device, int type)
-{
-	acpi_status status = AE_OK;
-	struct acpi_container *pc = NULL;
-
-	pc = acpi_driver_data(device);
-	kfree(pc);
-	return status;
-}
-
 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 {
 	struct acpi_device *device = NULL;
@@ -143,6 +88,8 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 	acpi_status status;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
+	acpi_scan_lock_acquire();
+
 	switch (type) {
 	case ACPI_NOTIFY_BUS_CHECK:
 		/* Fall through */
@@ -158,7 +105,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 				/* device exist and this is a remove request */
 				device->flags.eject_pending = 1;
 				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
-				return;
+				goto out;
 			}
 			break;
 		}
@@ -185,98 +132,59 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 		if (!acpi_bus_get_device(handle, &device) && device) {
 			device->flags.eject_pending = 1;
 			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
-			return;
+			goto out;
 		}
 		break;
 
 	default:
 		/* non-hotplug event; possibly handled by other handler */
-		return;
+		goto out;
 	}
 
 	/* Inform firmware that the hotplug operation has completed */
 	(void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
-	return;
+
+ out:
+	acpi_scan_lock_release();
 }
 
-static acpi_status
-container_walk_namespace_cb(acpi_handle handle,
-			    u32 lvl, void *context, void **rv)
+static bool is_container(acpi_handle handle)
 {
-	char *hid = NULL;
 	struct acpi_device_info *info;
-	acpi_status status;
-	int *action = context;
+	bool ret = false;
 
-	status = acpi_get_object_info(handle, &info);
-	if (ACPI_FAILURE(status)) {
-		return AE_OK;
-	}
-
-	if (info->valid & ACPI_VALID_HID)
-		hid = info->hardware_id.string;
-
-	if (hid == NULL) {
-		goto end;
-	}
+	if (ACPI_FAILURE(acpi_get_object_info(handle, &info)))
+		return false;
 
-	if (!is_container_device(hid))
-		goto end;
+	if (info->valid & ACPI_VALID_HID) {
+		const struct acpi_device_id *id;
 
-	switch (*action) {
-	case INSTALL_NOTIFY_HANDLER:
-		acpi_install_notify_handler(handle,
-					    ACPI_SYSTEM_NOTIFY,
-					    container_notify_cb, NULL);
-		break;
-	case UNINSTALL_NOTIFY_HANDLER:
-		acpi_remove_notify_handler(handle,
-					   ACPI_SYSTEM_NOTIFY,
-					   container_notify_cb);
-		break;
-	default:
-		break;
+		for (id = container_device_ids; id->id[0]; id++) {
+			ret = !strcmp((char *)id->id, info->hardware_id.string);
+			if (ret)
+				break;
+		}
 	}
-
-      end:
 	kfree(info);
-
-	return AE_OK;
+	return ret;
 }
 
-static int __init acpi_container_init(void)
+static acpi_status acpi_container_register_notify_handler(acpi_handle handle,
+							  u32 lvl, void *ctxt,
+							  void **retv)
 {
-	int result = 0;
-	int action = INSTALL_NOTIFY_HANDLER;
-
-	result = acpi_bus_register_driver(&acpi_container_driver);
-	if (result < 0) {
-		return (result);
-	}
-
-	/* register notify handler to every container device */
-	acpi_walk_namespace(ACPI_TYPE_DEVICE,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    container_walk_namespace_cb, NULL, &action, NULL);
+	if (is_container(handle))
+		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+					    container_notify_cb, NULL);
 
-	return (0);
+	return AE_OK;
 }
 
-static void __exit acpi_container_exit(void)
+void __init acpi_container_init(void)
 {
-	int action = UNINSTALL_NOTIFY_HANDLER;
-
+	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
+			    acpi_container_register_notify_handler, NULL,
+			    NULL, NULL);
 
-	acpi_walk_namespace(ACPI_TYPE_DEVICE,
-			    ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    container_walk_namespace_cb, NULL, &action, NULL);
-
-	acpi_bus_unregister_driver(&acpi_container_driver);
-
-	return;
+	acpi_scan_add_handler(&container_device_handler);
 }
-
-module_init(acpi_container_init);
-module_exit(acpi_container_exit);
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 78648f8..4fdea38 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -744,7 +744,9 @@ static void acpi_dock_deferred_cb(void *context)
 {
 	struct dock_data *data = context;
 
+	acpi_scan_lock_acquire();
 	dock_notify(data->handle, data->event, data->ds);
+	acpi_scan_lock_release();
 	kfree(data);
 }
 
@@ -757,20 +759,31 @@ static int acpi_dock_notifier_call(struct notifier_block *this,
 	if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
 	   && event != ACPI_NOTIFY_EJECT_REQUEST)
 		return 0;
+
+	acpi_scan_lock_acquire();
+
 	list_for_each_entry(dock_station, &dock_stations, sibling) {
 		if (dock_station->handle == handle) {
 			struct dock_data *dd;
+			acpi_status status;
 
 			dd = kmalloc(sizeof(*dd), GFP_KERNEL);
 			if (!dd)
-				return 0;
+				break;
+
 			dd->handle = handle;
 			dd->event = event;
 			dd->ds = dock_station;
-			acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd);
-			return 0 ;
+			status = acpi_os_hotplug_execute(acpi_dock_deferred_cb,
+							 dd);
+			if (ACPI_FAILURE(status))
+				kfree(dd);
+
+			break;
 		}
 	}
+
+	acpi_scan_lock_release();
 	return 0;
 }
 
@@ -825,7 +838,7 @@ static ssize_t show_docked(struct device *dev,
 
 	struct dock_station *dock_station = dev->platform_data;
 
-	if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp)))
+	if (!acpi_bus_get_device(dock_station->handle, &tmp))
 		return snprintf(buf, PAGE_SIZE, "1\n");
 	return snprintf(buf, PAGE_SIZE, "0\n");
 }
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 354007d..d45b287 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -852,7 +852,7 @@ static int acpi_ec_add(struct acpi_device *device)
 	return ret;
 }
 
-static int acpi_ec_remove(struct acpi_device *device, int type)
+static int acpi_ec_remove(struct acpi_device *device)
 {
 	struct acpi_ec *ec;
 	struct acpi_ec_query_handler *handler, *tmp;
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index 3bd6a54..f815da8 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -45,7 +45,7 @@ MODULE_DESCRIPTION("ACPI Fan Driver");
 MODULE_LICENSE("GPL");
 
 static int acpi_fan_add(struct acpi_device *device);
-static int acpi_fan_remove(struct acpi_device *device, int type);
+static int acpi_fan_remove(struct acpi_device *device);
 
 static const struct acpi_device_id fan_device_ids[] = {
 	{"PNP0C0B", 0},
@@ -172,7 +172,7 @@ static int acpi_fan_add(struct acpi_device *device)
 	return result;
 }
 
-static int acpi_fan_remove(struct acpi_device *device, int type)
+static int acpi_fan_remove(struct acpi_device *device)
 {
 	struct thermal_cooling_device *cdev = acpi_driver_data(device);
 
diff --git a/drivers/acpi/hed.c b/drivers/acpi/hed.c
index a0cc796..13b1d39 100644
--- a/drivers/acpi/hed.c
+++ b/drivers/acpi/hed.c
@@ -70,7 +70,7 @@ static int acpi_hed_add(struct acpi_device *device)
 	return 0;
 }
 
-static int acpi_hed_remove(struct acpi_device *device, int type)
+static int acpi_hed_remove(struct acpi_device *device)
 {
 	hed_handle = NULL;
 	return 0;
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index da23347..7909232 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -25,8 +25,16 @@
 
 int init_acpi_device_notify(void);
 int acpi_scan_init(void);
+void acpi_pci_root_init(void);
+void acpi_pci_link_init(void);
+void acpi_platform_init(void);
 int acpi_sysfs_init(void);
 void acpi_csrt_init(void);
+#ifdef CONFIG_ACPI_CONTAINER
+void acpi_container_init(void);
+#else
+static inline void acpi_container_init(void) {}
+#endif
 
 #ifdef CONFIG_DEBUG_FS
 extern struct dentry *acpi_debugfs_dir;
@@ -86,7 +94,6 @@ struct acpi_ec {
 
 extern struct acpi_ec *first_ec;
 
-int acpi_pci_root_init(void);
 int acpi_ec_init(void);
 int acpi_ec_ecdt_probe(void);
 int acpi_boot_ec_enable(void);
@@ -118,10 +125,4 @@ static inline void suspend_nvs_restore(void) {}
   -------------------------------------------------------------------------- */
 struct platform_device;
 
-/* Flags for acpi_create_platform_device */
-#define ACPI_PLATFORM_CLK	BIT(0)
-
-struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
-						    unsigned long flags);
-
 #endif /* _ACPI_INTERNAL_H_ */
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index a128082..ab764ed 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -53,23 +53,19 @@ ACPI_MODULE_NAME("pci_link");
 #define ACPI_PCI_LINK_FILE_STATUS	"state"
 #define ACPI_PCI_LINK_MAX_POSSIBLE	16
 
-static int acpi_pci_link_add(struct acpi_device *device);
-static int acpi_pci_link_remove(struct acpi_device *device, int type);
+static int acpi_pci_link_add(struct acpi_device *device,
+			     const struct acpi_device_id *not_used);
+static void acpi_pci_link_remove(struct acpi_device *device);
 
 static const struct acpi_device_id link_device_ids[] = {
 	{"PNP0C0F", 0},
 	{"", 0},
 };
-MODULE_DEVICE_TABLE(acpi, link_device_ids);
 
-static struct acpi_driver acpi_pci_link_driver = {
-	.name = "pci_link",
-	.class = ACPI_PCI_LINK_CLASS,
+static struct acpi_scan_handler pci_link_handler = {
 	.ids = link_device_ids,
-	.ops = {
-		.add = acpi_pci_link_add,
-		.remove = acpi_pci_link_remove,
-	},
+	.attach = acpi_pci_link_add,
+	.detach = acpi_pci_link_remove,
 };
 
 /*
@@ -692,7 +688,8 @@ int acpi_pci_link_free_irq(acpi_handle handle)
                                  Driver Interface
    -------------------------------------------------------------------------- */
 
-static int acpi_pci_link_add(struct acpi_device *device)
+static int acpi_pci_link_add(struct acpi_device *device,
+			     const struct acpi_device_id *not_used)
 {
 	int result;
 	struct acpi_pci_link *link;
@@ -746,7 +743,7 @@ static int acpi_pci_link_add(struct acpi_device *device)
 	if (result)
 		kfree(link);
 
-	return result;
+	return result < 0 ? result : 1;
 }
 
 static int acpi_pci_link_resume(struct acpi_pci_link *link)
@@ -766,7 +763,7 @@ static void irqrouter_resume(void)
 	}
 }
 
-static int acpi_pci_link_remove(struct acpi_device *device, int type)
+static void acpi_pci_link_remove(struct acpi_device *device)
 {
 	struct acpi_pci_link *link;
 
@@ -777,7 +774,6 @@ static int acpi_pci_link_remove(struct acpi_device *device, int type)
 	mutex_unlock(&acpi_link_lock);
 
 	kfree(link);
-	return 0;
 }
 
 /*
@@ -874,20 +870,10 @@ static struct syscore_ops irqrouter_syscore_ops = {
 	.resume = irqrouter_resume,
 };
 
-static int __init irqrouter_init_ops(void)
-{
-	if (!acpi_disabled && !acpi_noirq)
-		register_syscore_ops(&irqrouter_syscore_ops);
-
-	return 0;
-}
-
-device_initcall(irqrouter_init_ops);
-
-static int __init acpi_pci_link_init(void)
+void __init acpi_pci_link_init(void)
 {
 	if (acpi_noirq)
-		return 0;
+		return;
 
 	if (acpi_irq_balance == -1) {
 		/* no command line switch: enable balancing in IOAPIC mode */
@@ -896,11 +882,6 @@ static int __init acpi_pci_link_init(void)
 		else
 			acpi_irq_balance = 0;
 	}
-
-	if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
-		return -ENODEV;
-
-	return 0;
+	register_syscore_ops(&irqrouter_syscore_ops);
+	acpi_scan_add_handler(&pci_link_handler);
 }
-
-subsys_initcall(acpi_pci_link_init);
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 22a8458..b3cc69c 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -45,8 +45,9 @@
 ACPI_MODULE_NAME("pci_root");
 #define ACPI_PCI_ROOT_CLASS		"pci_bridge"
 #define ACPI_PCI_ROOT_DEVICE_NAME	"PCI Root Bridge"
-static int acpi_pci_root_add(struct acpi_device *device);
-static int acpi_pci_root_remove(struct acpi_device *device, int type);
+static int acpi_pci_root_add(struct acpi_device *device,
+			     const struct acpi_device_id *not_used);
+static void acpi_pci_root_remove(struct acpi_device *device);
 
 #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
 				| OSC_ACTIVE_STATE_PWR_SUPPORT \
@@ -57,16 +58,11 @@ static const struct acpi_device_id root_device_ids[] = {
 	{"PNP0A03", 0},
 	{"", 0},
 };
-MODULE_DEVICE_TABLE(acpi, root_device_ids);
 
-static struct acpi_driver acpi_pci_root_driver = {
-	.name = "pci_root",
-	.class = ACPI_PCI_ROOT_CLASS,
+static struct acpi_scan_handler pci_root_handler = {
 	.ids = root_device_ids,
-	.ops = {
-		.add = acpi_pci_root_add,
-		.remove = acpi_pci_root_remove,
-		},
+	.attach = acpi_pci_root_add,
+	.detach = acpi_pci_root_remove,
 };
 
 /* Lock to protect both acpi_pci_roots and acpi_pci_drivers lists */
@@ -428,7 +424,8 @@ out:
 }
 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 
-static int acpi_pci_root_add(struct acpi_device *device)
+static int acpi_pci_root_add(struct acpi_device *device,
+			     const struct acpi_device_id *not_used)
 {
 	unsigned long long segment, bus;
 	acpi_status status;
@@ -614,7 +611,7 @@ static int acpi_pci_root_add(struct acpi_device *device)
 		pci_enable_bridges(root->bus);
 
 	pci_bus_add_devices(root->bus);
-	return 0;
+	return 1;
 
 out_del_root:
 	mutex_lock(&acpi_pci_root_lock);
@@ -627,7 +624,7 @@ end:
 	return result;
 }
 
-static int acpi_pci_root_remove(struct acpi_device *device, int type)
+static void acpi_pci_root_remove(struct acpi_device *device)
 {
 	acpi_status status;
 	acpi_handle handle;
@@ -655,19 +652,14 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
 	list_del(&root->node);
 	mutex_unlock(&acpi_pci_root_lock);
 	kfree(root);
-	return 0;
 }
 
-int __init acpi_pci_root_init(void)
+void __init acpi_pci_root_init(void)
 {
 	acpi_hest_init();
 
-	if (acpi_pci_disabled)
-		return 0;
-
-	pci_acpi_crs_quirks();
-	if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0)
-		return -ENODEV;
-
-	return 0;
+	if (!acpi_pci_disabled) {
+		pci_acpi_crs_quirks();
+		acpi_scan_add_handler(&pci_root_handler);
+	}
 }
diff --git a/drivers/acpi/pci_slot.c b/drivers/acpi/pci_slot.c
index d22585f..2c630c0 100644
--- a/drivers/acpi/pci_slot.c
+++ b/drivers/acpi/pci_slot.c
@@ -50,13 +50,12 @@ module_param(debug, bool, 0644);
 ACPI_MODULE_NAME("pci_slot");
 
 #define MY_NAME "pci_slot"
-#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
-#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
+#define err(format, arg...) pr_err("%s: " format , MY_NAME , ## arg)
+#define info(format, arg...) pr_info("%s: " format , MY_NAME , ## arg)
 #define dbg(format, arg...)					\
 	do {							\
 		if (debug)					\
-			printk(KERN_DEBUG "%s: " format,	\
-				MY_NAME , ## arg);		\
+			pr_debug("%s: " format,	MY_NAME , ## arg); \
 	} while (0)
 
 #define SLOT_NAME_SIZE 21		/* Inspired by #define in acpiphp.h */
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 9c5929a..cbf1f12 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -81,7 +81,7 @@ MODULE_DESCRIPTION("ACPI Processor Driver");
 MODULE_LICENSE("GPL");
 
 static int acpi_processor_add(struct acpi_device *device);
-static int acpi_processor_remove(struct acpi_device *device, int type);
+static int acpi_processor_remove(struct acpi_device *device);
 static void acpi_processor_notify(struct acpi_device *device, u32 event);
 static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
 static int acpi_processor_handle_eject(struct acpi_processor *pr);
@@ -610,7 +610,7 @@ err_free_pr:
 	return result;
 }
 
-static int acpi_processor_remove(struct acpi_device *device, int type)
+static int acpi_processor_remove(struct acpi_device *device)
 {
 	struct acpi_processor *pr = NULL;
 
@@ -623,7 +623,7 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
 	if (pr->id >= nr_cpu_ids)
 		goto free;
 
-	if (type == ACPI_BUS_REMOVAL_EJECT) {
+	if (device->removal_type == ACPI_BUS_REMOVAL_EJECT) {
 		if (acpi_processor_handle_eject(pr))
 			return -EINVAL;
 	}
@@ -683,8 +683,11 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
 	struct acpi_device *device = NULL;
 	struct acpi_eject_event *ej_event = NULL;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
+	acpi_status status;
 	int result;
 
+	acpi_scan_lock_acquire();
+
 	switch (event) {
 	case ACPI_NOTIFY_BUS_CHECK:
 	case ACPI_NOTIFY_DEVICE_CHECK:
@@ -733,25 +736,32 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
 			break;
 		}
 
+		get_device(&device->dev);
 		ej_event->device = device;
 		ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
-		acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
-					(void *)ej_event);
-
-		/* eject is performed asynchronously */
-		return;
+		/* The eject is carried out asynchronously. */
+		status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
+						 ej_event);
+		if (ACPI_FAILURE(status)) {
+			put_device(&device->dev);
+			kfree(ej_event);
+			break;
+		}
+		goto out;
 
 	default:
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Unsupported event [0x%x]\n", event));
 
 		/* non-hotplug event; possibly handled by other handler */
-		return;
+		goto out;
 	}
 
 	/* Inform firmware that the hotplug operation has completed */
 	(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
-	return;
+
+ out:
+	acpi_scan_lock_release();
 }
 
 static acpi_status is_processor_device(acpi_handle handle)
diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index ff0740e..e523245 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -130,7 +130,7 @@ struct acpi_sbs {
 
 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 
-static int acpi_sbs_remove(struct acpi_device *device, int type);
+static int acpi_sbs_remove(struct acpi_device *device);
 static int acpi_battery_get_state(struct acpi_battery *battery);
 
 static inline int battery_scale(int log)
@@ -949,11 +949,11 @@ static int acpi_sbs_add(struct acpi_device *device)
 	acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
       end:
 	if (result)
-		acpi_sbs_remove(device, 0);
+		acpi_sbs_remove(device);
 	return result;
 }
 
-static int acpi_sbs_remove(struct acpi_device *device, int type)
+static int acpi_sbs_remove(struct acpi_device *device)
 {
 	struct acpi_sbs *sbs;
 	int id;
diff --git a/drivers/acpi/sbshc.c b/drivers/acpi/sbshc.c
index cf6129a..b78bc60 100644
--- a/drivers/acpi/sbshc.c
+++ b/drivers/acpi/sbshc.c
@@ -33,7 +33,7 @@ struct acpi_smb_hc {
 };
 
 static int acpi_smbus_hc_add(struct acpi_device *device);
-static int acpi_smbus_hc_remove(struct acpi_device *device, int type);
+static int acpi_smbus_hc_remove(struct acpi_device *device);
 
 static const struct acpi_device_id sbs_device_ids[] = {
 	{"ACPI0001", 0},
@@ -296,7 +296,7 @@ static int acpi_smbus_hc_add(struct acpi_device *device)
 
 extern void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
 
-static int acpi_smbus_hc_remove(struct acpi_device *device, int type)
+static int acpi_smbus_hc_remove(struct acpi_device *device)
 {
 	struct acpi_smb_hc *hc;
 
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index c435871..daee749 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -29,30 +29,10 @@ extern struct acpi_device *acpi_root;
 
 static const char *dummy_hid = "device";
 
-/*
- * The following ACPI IDs are known to be suitable for representing as
- * platform devices.
- */
-static const struct acpi_device_id acpi_platform_device_ids[] = {
-
-	{ "PNP0D40" },
-
-	/* Haswell LPSS devices */
-	{ "INT33C0", ACPI_PLATFORM_CLK },
-	{ "INT33C1", ACPI_PLATFORM_CLK },
-	{ "INT33C2", ACPI_PLATFORM_CLK },
-	{ "INT33C3", ACPI_PLATFORM_CLK },
-	{ "INT33C4", ACPI_PLATFORM_CLK },
-	{ "INT33C5", ACPI_PLATFORM_CLK },
-	{ "INT33C6", ACPI_PLATFORM_CLK },
-	{ "INT33C7", ACPI_PLATFORM_CLK },
-
-	{ }
-};
-
 static LIST_HEAD(acpi_device_list);
 static LIST_HEAD(acpi_bus_id_list);
 static DEFINE_MUTEX(acpi_scan_lock);
+static LIST_HEAD(acpi_scan_handlers_list);
 DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
 
@@ -62,6 +42,27 @@ struct acpi_device_bus_id{
 	struct list_head node;
 };
 
+void acpi_scan_lock_acquire(void)
+{
+	mutex_lock(&acpi_scan_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
+
+void acpi_scan_lock_release(void)
+{
+	mutex_unlock(&acpi_scan_lock);
+}
+EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
+
+int acpi_scan_add_handler(struct acpi_scan_handler *handler)
+{
+	if (!handler || !handler->attach)
+		return -EINVAL;
+
+	list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
+	return 0;
+}
+
 /*
  * Creates hid/cid(s) string needed for modalias and uevent
  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
@@ -116,7 +117,7 @@ static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  */
 void acpi_bus_hot_remove_device(void *context)
 {
-	struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
+	struct acpi_eject_event *ej_event = context;
 	struct acpi_device *device = ej_event->device;
 	acpi_handle handle = device->handle;
 	acpi_handle temp;
@@ -125,19 +126,23 @@ void acpi_bus_hot_remove_device(void *context)
 	acpi_status status = AE_OK;
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
+	mutex_lock(&acpi_scan_lock);
+
+	/* If there is no handle, the device node has been unregistered. */
+	if (!device->handle) {
+		dev_dbg(&device->dev, "ACPI handle missing\n");
+		put_device(&device->dev);
+		goto out;
+	}
+
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 		"Hot-removing device %s...\n", dev_name(&device->dev)));
 
 	acpi_bus_trim(device);
-	/* Device node has been released. */
+	/* Device node has been unregistered. */
+	put_device(&device->dev);
 	device = NULL;
 
-	/* power off device */
-	status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
-	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
-		printk(KERN_WARNING PREFIX
-				"Power-off device failed\n");
-
 	if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 		arg_list.count = 1;
 		arg_list.pointer = &arg;
@@ -157,18 +162,15 @@ void acpi_bus_hot_remove_device(void *context)
 	status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 	if (ACPI_FAILURE(status)) {
 		if (status != AE_NOT_FOUND)
-			printk(KERN_WARNING PREFIX
-					"Eject device failed\n");
-		goto err_out;
-	}
+			acpi_handle_warn(handle, "Eject failed\n");
 
-	kfree(context);
-	return;
+		/* Tell the firmware the hot-remove operation has failed. */
+		acpi_evaluate_hotplug_ost(handle, ej_event->event,
+					  ost_code, NULL);
+	}
 
-err_out:
-	/* Inform firmware the hot-remove operation has completed w/ error */
-	(void) acpi_evaluate_hotplug_ost(handle,
-				ej_event->event, ost_code, NULL);
+ out:
+	mutex_unlock(&acpi_scan_lock);
 	kfree(context);
 	return;
 }
@@ -213,12 +215,10 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 	if ((!count) || (buf[0] != '1')) {
 		return -EINVAL;
 	}
-#ifndef FORCE_EJECT
-	if (acpi_device->driver == NULL) {
+	if (!acpi_device->driver && !acpi_device->handler) {
 		ret = -ENODEV;
 		goto err;
 	}
-#endif
 	status = acpi_get_type(acpi_device->handle, &type);
 	if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 		ret = -ENODEV;
@@ -231,6 +231,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 		goto err;
 	}
 
+	get_device(&acpi_device->dev);
 	ej_event->device = acpi_device;
 	if (acpi_device->flags.eject_pending) {
 		/* event originated from ACPI eject notification */
@@ -243,7 +244,11 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
 			ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 	}
 
-	acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
+	status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
+	if (ACPI_FAILURE(status)) {
+		put_device(&acpi_device->dev);
+		kfree(ej_event);
+	}
 err:
 	return ret;
 }
@@ -637,8 +642,9 @@ static int acpi_device_probe(struct device * dev)
 			ret = acpi_device_install_notify_handler(acpi_dev);
 			if (ret) {
 				if (acpi_drv->ops.remove)
-					acpi_drv->ops.remove(acpi_dev,
-						     acpi_dev->removal_type);
+					acpi_drv->ops.remove(acpi_dev);
+				acpi_dev->driver = NULL;
+				acpi_dev->driver_data = NULL;
 				return ret;
 			}
 		}
@@ -660,7 +666,7 @@ static int acpi_device_remove(struct device * dev)
 		if (acpi_drv->ops.notify)
 			acpi_device_remove_notify_handler(acpi_dev);
 		if (acpi_drv->ops.remove)
-			acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
+			acpi_drv->ops.remove(acpi_dev);
 	}
 	acpi_dev->driver = NULL;
 	acpi_dev->driver_data = NULL;
@@ -792,10 +798,12 @@ static void acpi_device_unregister(struct acpi_device *device)
 
 	device_del(&device->dev);
 	/*
-	 * Drop the reference counts of all power resources the device depends
-	 * on and turn off the ones that have no more references.
+	 * Transition the device to D3cold to drop the reference counts of all
+	 * power resources the device depends on and turn off the ones that have
+	 * no more references.
 	 */
-	acpi_power_transition(device, ACPI_STATE_D3_COLD);
+	acpi_device_set_power(device, ACPI_STATE_D3_COLD);
+	device->handle = NULL;
 	put_device(&device->dev);
 }
 
@@ -883,29 +891,23 @@ EXPORT_SYMBOL(acpi_bus_unregister_driver);
    -------------------------------------------------------------------------- */
 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 {
+	struct acpi_device *device = NULL;
 	acpi_status status;
-	int ret;
-	struct acpi_device *device;
 
 	/*
 	 * Fixed hardware devices do not appear in the namespace and do not
 	 * have handles, but we fabricate acpi_devices for them, so we have
 	 * to deal with them specially.
 	 */
-	if (handle == NULL)
+	if (!handle)
 		return acpi_root;
 
 	do {
 		status = acpi_get_parent(handle, &handle);
-		if (status == AE_NULL_ENTRY)
-			return NULL;
 		if (ACPI_FAILURE(status))
-			return acpi_root;
-
-		ret = acpi_bus_get_device(handle, &device);
-		if (ret == 0)
-			return device;
-	} while (1);
+			return status == AE_NULL_ENTRY ? NULL : acpi_root;
+	} while (acpi_bus_get_device(handle, &device));
+	return device;
 }
 
 acpi_status
@@ -1441,19 +1443,21 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
 	acpi_device_get_busid(device);
 	acpi_device_set_id(device);
 	acpi_bus_get_flags(device);
+	device->flags.match_driver = false;
 	device_initialize(&device->dev);
 	dev_set_uevent_suppress(&device->dev, true);
 }
 
 void acpi_device_add_finalize(struct acpi_device *device)
 {
+	device->flags.match_driver = true;
 	dev_set_uevent_suppress(&device->dev, false);
 	kobject_uevent(&device->dev.kobj, KOBJ_ADD);
 }
 
 static int acpi_add_single_object(struct acpi_device **child,
 				  acpi_handle handle, int type,
-				  unsigned long long sta, bool match_driver)
+				  unsigned long long sta)
 {
 	int result;
 	struct acpi_device *device;
@@ -1469,7 +1473,6 @@ static int acpi_add_single_object(struct acpi_device **child,
 	acpi_bus_get_power_flags(device);
 	acpi_bus_get_wakeup_device_flags(device);
 
-	device->flags.match_driver = match_driver;
 	result = acpi_device_add(device, acpi_device_release);
 	if (result) {
 		acpi_device_release(&device->dev);
@@ -1562,12 +1565,10 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 		return AE_CTRL_DEPTH;
 	}
 
-	acpi_add_single_object(&device, handle, type, sta, false);
+	acpi_add_single_object(&device, handle, type, sta);
 	if (!device)
 		return AE_CTRL_DEPTH;
 
-	device->flags.match_driver = true;
-
  out:
 	if (!*return_value)
 		*return_value = device;
@@ -1575,33 +1576,68 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
 	return AE_OK;
 }
 
+static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id)
+{
+	struct acpi_scan_handler *handler;
+
+	list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
+		const struct acpi_device_id *devid;
+
+		for (devid = handler->ids; devid->id[0]; devid++) {
+			int ret;
+
+			if (strcmp((char *)devid->id, id))
+				continue;
+
+			ret = handler->attach(device, devid);
+			if (ret > 0) {
+				device->handler = handler;
+				return ret;
+			} else if (ret < 0) {
+				return ret;
+			}
+		}
+	}
+	return 0;
+}
+
+static int acpi_scan_attach_handler(struct acpi_device *device)
+{
+	struct acpi_hardware_id *hwid;
+	int ret = 0;
+
+	list_for_each_entry(hwid, &device->pnp.ids, list) {
+		ret = acpi_scan_do_attach_handler(device, hwid->id);
+		if (ret)
+			break;
+
+	}
+	return ret;
+}
+
 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
 					  void *not_used, void **ret_not_used)
 {
-	const struct acpi_device_id *id;
-	acpi_status status = AE_OK;
 	struct acpi_device *device;
 	unsigned long long sta_not_used;
-	int type_not_used;
+	int ret;
 
 	/*
 	 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
 	 * namespace walks prematurely.
 	 */
-	if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
+	if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
 		return AE_OK;
 
 	if (acpi_bus_get_device(handle, &device))
 		return AE_CTRL_DEPTH;
 
-	id = __acpi_match_device(device, acpi_platform_device_ids);
-	if (id) {
-		/* This is a known good platform device. */
-		acpi_create_platform_device(device, id->driver_data);
-	} else if (device_attach(&device->dev) < 0) {
-		status = AE_CTRL_DEPTH;
-	}
-	return status;
+	ret = acpi_scan_attach_handler(device);
+	if (ret)
+		return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
+
+	ret = device_attach(&device->dev);
+	return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
 }
 
 /**
@@ -1615,14 +1651,14 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
  * there has been a real error.  There just have been no suitable ACPI objects
  * in the table trunk from which the kernel could create a device and add an
  * appropriate driver.
+ *
+ * Must be called under acpi_scan_lock.
  */
 int acpi_bus_scan(acpi_handle handle)
 {
 	void *device = NULL;
 	int error = 0;
 
-	mutex_lock(&acpi_scan_lock);
-
 	if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 				    acpi_bus_check_add, NULL, NULL, &device);
@@ -1633,7 +1669,6 @@ int acpi_bus_scan(acpi_handle handle)
 		acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
 				    acpi_bus_device_attach, NULL, NULL, NULL);
 
-	mutex_unlock(&acpi_scan_lock);
 	return error;
 }
 EXPORT_SYMBOL(acpi_bus_scan);
@@ -1644,8 +1679,17 @@ static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
 	struct acpi_device *device = NULL;
 
 	if (!acpi_bus_get_device(handle, &device)) {
+		struct acpi_scan_handler *dev_handler = device->handler;
+
 		device->removal_type = ACPI_BUS_REMOVAL_EJECT;
-		device_release_driver(&device->dev);
+		if (dev_handler) {
+			if (dev_handler->detach)
+				dev_handler->detach(device);
+
+			device->handler = NULL;
+		} else {
+			device_release_driver(&device->dev);
+		}
 	}
 	return AE_OK;
 }
@@ -1661,10 +1705,14 @@ static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
 	return AE_OK;
 }
 
+/**
+ * acpi_bus_trim - Remove ACPI device node and all of its descendants
+ * @start: Root of the ACPI device nodes subtree to remove.
+ *
+ * Must be called under acpi_scan_lock.
+ */
 void acpi_bus_trim(struct acpi_device *start)
 {
-	mutex_lock(&acpi_scan_lock);
-
 	/*
 	 * Execute acpi_bus_device_detach() as a post-order callback to detach
 	 * all ACPI drivers from the device nodes being removed.
@@ -1679,33 +1727,45 @@ void acpi_bus_trim(struct acpi_device *start)
 	acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
 			    acpi_bus_remove, NULL, NULL);
 	acpi_bus_remove(start->handle, 0, NULL, NULL);
-
-	mutex_unlock(&acpi_scan_lock);
 }
 EXPORT_SYMBOL_GPL(acpi_bus_trim);
 
 static int acpi_bus_scan_fixed(void)
 {
 	int result = 0;
-	struct acpi_device *device = NULL;
 
 	/*
 	 * Enumerate all fixed-feature devices.
 	 */
-	if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
+	if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
+		struct acpi_device *device = NULL;
+
 		result = acpi_add_single_object(&device, NULL,
 						ACPI_BUS_TYPE_POWER_BUTTON,
-						ACPI_STA_DEFAULT, true);
+						ACPI_STA_DEFAULT);
+		if (result)
+			return result;
+
+		result = device_attach(&device->dev);
+		if (result < 0)
+			return result;
+
 		device_init_wakeup(&device->dev, true);
 	}
 
-	if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
+	if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
+		struct acpi_device *device = NULL;
+
 		result = acpi_add_single_object(&device, NULL,
 						ACPI_BUS_TYPE_SLEEP_BUTTON,
-						ACPI_STA_DEFAULT, true);
+						ACPI_STA_DEFAULT);
+		if (result)
+			return result;
+
+		result = device_attach(&device->dev);
 	}
 
-	return result;
+	return result < 0 ? result : 0;
 }
 
 int __init acpi_scan_init(void)
@@ -1719,25 +1779,32 @@ int __init acpi_scan_init(void)
 	}
 
 	acpi_pci_root_init();
+	acpi_pci_link_init();
+	acpi_platform_init();
 	acpi_csrt_init();
+	acpi_container_init();
 
+	mutex_lock(&acpi_scan_lock);
 	/*
 	 * Enumerate devices in the ACPI namespace.
 	 */
 	result = acpi_bus_scan(ACPI_ROOT_OBJECT);
 	if (result)
-		return result;
+		goto out;
 
 	result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
 	if (result)
-		return result;
+		goto out;
 
 	result = acpi_bus_scan_fixed();
 	if (result) {
 		acpi_device_unregister(acpi_root);
-		return result;
+		goto out;
 	}
 
 	acpi_update_all_gpes();
-	return 0;
+
+ out:
+	mutex_unlock(&acpi_scan_lock);
+	return result;
 }
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 506fbd4..da079d4 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -97,7 +97,7 @@ module_param(psv, int, 0644);
 MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
 
 static int acpi_thermal_add(struct acpi_device *device);
-static int acpi_thermal_remove(struct acpi_device *device, int type);
+static int acpi_thermal_remove(struct acpi_device *device);
 static void acpi_thermal_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id  thermal_device_ids[] = {
@@ -1111,7 +1111,7 @@ end:
 	return result;
 }
 
-static int acpi_thermal_remove(struct acpi_device *device, int type)
+static int acpi_thermal_remove(struct acpi_device *device)
 {
 	struct acpi_thermal *tz = NULL;
 
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index ac9a69c..5be60ad 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -88,7 +88,7 @@ module_param(use_bios_initial_backlight, bool, 0644);
 
 static int register_count = 0;
 static int acpi_video_bus_add(struct acpi_device *device);
-static int acpi_video_bus_remove(struct acpi_device *device, int type);
+static int acpi_video_bus_remove(struct acpi_device *device);
 static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
 
 static const struct acpi_device_id video_device_ids[] = {
@@ -1740,7 +1740,7 @@ static int acpi_video_bus_add(struct acpi_device *device)
 	return error;
 }
 
-static int acpi_video_bus_remove(struct acpi_device *device, int type)
+static int acpi_video_bus_remove(struct acpi_device *device)
 {
 	struct acpi_video_bus *video = NULL;