Merge branch 'acpi-scan' into acpi-lpss

The following commits depend on the 'acpi-scan' material.

11 files changed, 191 insertions, 479 deletions

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 2a4502becd13..4ee2e753306a 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -37,7 +37,7 @@ acpi-y				+= resource.o
 acpi-y                          += processor_core.o
 acpi-y                          += ec.o
 acpi-$(CONFIG_ACPI_DOCK)        += dock.o
-acpi-y                          += pci_root.o pci_link.o pci_irq.o pci_bind.o
+acpi-y                          += pci_root.o pci_link.o pci_irq.o
 acpi-y                          += acpi_platform.o
 acpi-y                          += power.o
 acpi-y                          += event.o
diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index b679bf8478f7..d2a0656c3604 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -157,38 +157,26 @@ static int
 acpi_memory_get_device(acpi_handle handle,
                        struct acpi_memory_device **mem_device)
 {
-        acpi_status status;
-        acpi_handle phandle;
         struct acpi_device *device = NULL;
-        struct acpi_device *pdevice = NULL;
         int result;
 
-
         if (!acpi_bus_get_device(handle, &device) && device)
                 goto end;
 
-        status = acpi_get_parent(handle, &phandle);
-        if (ACPI_FAILURE(status)) {
-                ACPI_EXCEPTION((AE_INFO, status, "Cannot find acpi parent"));
-                return -EINVAL;
-        }
-
-        /* Get the parent device */
-        result = acpi_bus_get_device(phandle, &pdevice);
-        if (result) {
-                acpi_handle_warn(phandle, "Cannot get acpi bus device\n");
-                return -EINVAL;
-        }
-
         /*
          * Now add the notified device.  This creates the acpi_device
          * and invokes .add function
          */
-        result = acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE);
+        result = acpi_bus_add(handle);
         if (result) {
                 acpi_handle_warn(handle, "Cannot add acpi bus\n");
                 return -EINVAL;
         }
+        result = acpi_bus_get_device(handle, &device);
+        if (result) {
+                acpi_handle_warn(handle, "Missing device object\n");
+                return -EINVAL;
+        }
 
       end:
         *mem_device = acpi_driver_data(device);
@@ -355,7 +343,7 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
                         break;
                 }
 
-                ej_event->handle = handle;
+                ej_event->device = device;
                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
                 acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
                                         (void *)ej_event);
diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 811910b50b75..f8fb2281f34a 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -135,30 +135,6 @@ static int acpi_container_remove(struct acpi_device *device, int type)
         return status;
 }
 
-static int container_device_add(struct acpi_device **device, acpi_handle handle)
-{
-        acpi_handle phandle;
-        struct acpi_device *pdev;
-        int result;
-
-
-        if (acpi_get_parent(handle, &phandle)) {
-                return -ENODEV;
-        }
-
-        if (acpi_bus_get_device(phandle, &pdev)) {
-                return -ENODEV;
-        }
-
-        if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
-                return -ENODEV;
-        }
-
-        result = acpi_bus_start(*device);
-
-        return result;
-}
-
 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
 {
         struct acpi_device *device = NULL;
@@ -190,11 +166,16 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
                 if (!ACPI_FAILURE(status) || device)
                         break;
 
-                result = container_device_add(&device, handle);
+                result = acpi_bus_add(handle);
                 if (result) {
                         acpi_handle_warn(handle, "Failed to add container\n");
                         break;
                 }
+                result = acpi_bus_get_device(handle, &device);
+                if (result) {
+                        acpi_handle_warn(handle, "Missing device object\n");
+                        break;
+                }
 
                 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
                 ost_code = ACPI_OST_SC_SUCCESS;
diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index c6ff606c6d5b..995019063f64 100644
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -353,7 +353,7 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
  * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
  * @dev: Device to get the ACPI node for.
  */
-static struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
+struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
 {
         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
         struct acpi_device *adev;
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index f32bd47b35e0..4a56a8b2e51e 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -310,8 +310,6 @@ static int dock_present(struct dock_station *ds)
 static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
 {
         struct acpi_device *device;
-        struct acpi_device *parent_device;
-        acpi_handle parent;
         int ret;
 
         if (acpi_bus_get_device(handle, &device)) {
@@ -319,16 +317,11 @@ static struct acpi_device * dock_create_acpi_device(acpi_handle handle)
                  * no device created for this object,
                  * so we should create one.
                  */
-                acpi_get_parent(handle, &parent);
-                if (acpi_bus_get_device(parent, &parent_device))
-                        parent_device = NULL;
-
-                ret = acpi_bus_add(&device, parent_device, handle,
-                        ACPI_BUS_TYPE_DEVICE);
-                if (ret) {
+                ret = acpi_bus_add(handle);
+                if (ret)
                         pr_debug("error adding bus, %x\n", -ret);
-                        return NULL;
-                }
+
+                acpi_bus_get_device(handle, &device);
         }
         return device;
 }
@@ -346,7 +339,7 @@ static void dock_remove_acpi_device(acpi_handle handle)
         int ret;
 
         if (!acpi_bus_get_device(handle, &device)) {
-                ret = acpi_bus_trim(device, 1);
+                ret = acpi_bus_trim(device);
                 if (ret)
                         pr_debug("error removing bus, %x\n", -ret);
         }
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 35da18113216..9aee4fc2b218 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -68,6 +68,9 @@ static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
 {
         struct acpi_bus_type *tmp, *ret = NULL;
 
+        if (!type)
+                return NULL;
+
         down_read(&bus_type_sem);
         list_for_each_entry(tmp, &bus_type_list, list) {
                 if (tmp->bus == type) {
@@ -269,28 +272,39 @@ static int acpi_platform_notify(struct device *dev)
 {
         struct acpi_bus_type *type;
         acpi_handle handle;
-        int ret = -EINVAL;
+        int ret;
 
         ret = acpi_bind_one(dev, NULL);
-        if (!ret)
-                goto out;
-
-        if (!dev->bus || !dev->parent) {
+        if (ret && (!dev->bus || !dev->parent)) {
                 /* bridge devices genernally haven't bus or parent */
                 ret = acpi_find_bridge_device(dev, &handle);
-                goto end;
+                if (!ret) {
+                        ret = acpi_bind_one(dev, handle);
+                        if (ret)
+                                goto out;
+                }
         }
+
         type = acpi_get_bus_type(dev->bus);
-        if (!type) {
-                DBG("No ACPI bus support for %s\n", dev_name(dev));
-                ret = -EINVAL;
-                goto end;
+        if (ret) {
+                if (!type || !type->find_device) {
+                        DBG("No ACPI bus support for %s\n", dev_name(dev));
+                        ret = -EINVAL;
+                        goto out;
+                }
+
+                ret = type->find_device(dev, &handle);
+                if (ret) {
+                        DBG("Unable to get handle for %s\n", dev_name(dev));
+                        goto out;
+                }
+                ret = acpi_bind_one(dev, handle);
+                if (ret)
+                        goto out;
         }
-        if ((ret = type->find_device(dev, &handle)) != 0)
-                DBG("Can't get handler for %s\n", dev_name(dev));
- end:
-        if (!ret)
-                acpi_bind_one(dev, handle);
+
+        if (type && type->setup)
+                type->setup(dev);
 
  out:
 #if ACPI_GLUE_DEBUG
@@ -309,6 +323,12 @@ static int acpi_platform_notify(struct device *dev)
 
 static int acpi_platform_notify_remove(struct device *dev)
 {
+        struct acpi_bus_type *type;
+
+        type = acpi_get_bus_type(dev->bus);
+        if (type && type->cleanup)
+                type->cleanup(dev);
+
         acpi_unbind_one(dev);
         return 0;
 }
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 3c407cdc1ec1..e050254ae143 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -67,6 +67,7 @@ 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);
diff --git a/drivers/acpi/pci_bind.c b/drivers/acpi/pci_bind.c
deleted file mode 100644
index a1dee29beed3..000000000000
--- a/drivers/acpi/pci_bind.c
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- *  pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
- *
- *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
- *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or (at
- *  your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful, but
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/pci-acpi.h>
-#include <linux/acpi.h>
-#include <linux/pm_runtime.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-
-#define _COMPONENT              ACPI_PCI_COMPONENT
-ACPI_MODULE_NAME("pci_bind");
-
-static int acpi_pci_unbind(struct acpi_device *device)
-{
-        struct pci_dev *dev;
-
-        dev = acpi_get_pci_dev(device->handle);
-        if (!dev)
-                goto out;
-
-        device_set_run_wake(&dev->dev, false);
-        pci_acpi_remove_pm_notifier(device);
-        acpi_power_resource_unregister_device(&dev->dev, device->handle);
-
-        if (!dev->subordinate)
-                goto out;
-
-        acpi_pci_irq_del_prt(pci_domain_nr(dev->bus), dev->subordinate->number);
-
-        device->ops.bind = NULL;
-        device->ops.unbind = NULL;
-
-out:
-        pci_dev_put(dev);
-        return 0;
-}
-
-static int acpi_pci_bind(struct acpi_device *device)
-{
-        acpi_status status;
-        acpi_handle handle;
-        unsigned char bus;
-        struct pci_dev *dev;
-
-        dev = acpi_get_pci_dev(device->handle);
-        if (!dev)
-                return 0;
-
-        pci_acpi_add_pm_notifier(device, dev);
-        acpi_power_resource_register_device(&dev->dev, device->handle);
-        if (device->wakeup.flags.run_wake)
-                device_set_run_wake(&dev->dev, true);
-
-        /*
-         * Install the 'bind' function to facilitate callbacks for
-         * children of the P2P bridge.
-         */
-        if (dev->subordinate) {
-                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                  "Device %04x:%02x:%02x.%d is a PCI bridge\n",
-                                  pci_domain_nr(dev->bus), dev->bus->number,
-                                  PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn)));
-                device->ops.bind = acpi_pci_bind;
-                device->ops.unbind = acpi_pci_unbind;
-        }
-
-        /*
-         * Evaluate and parse _PRT, if exists.  This code allows parsing of
-         * _PRT objects within the scope of non-bridge devices.  Note that
-         * _PRTs within the scope of a PCI bridge assume the bridge's
-         * subordinate bus number.
-         *
-         * TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
-         */
-        status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
-        if (ACPI_FAILURE(status))
-                goto out;
-
-        if (dev->subordinate)
-                bus = dev->subordinate->number;
-        else
-                bus = dev->bus->number;
-
-        acpi_pci_irq_add_prt(device->handle, pci_domain_nr(dev->bus), bus);
-
-out:
-        pci_dev_put(dev);
-        return 0;
-}
-
-int acpi_pci_bind_root(struct acpi_device *device)
-{
-        device->ops.bind = acpi_pci_bind;
-        device->ops.unbind = acpi_pci_unbind;
-
-        return 0;
-}
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 7928d4dc7056..22a8458b4ec9 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -47,7 +47,6 @@ ACPI_MODULE_NAME("pci_root");
 #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_start(struct acpi_device *device);
 
 #define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
                                 | OSC_ACTIVE_STATE_PWR_SUPPORT \
@@ -67,7 +66,6 @@ static struct acpi_driver acpi_pci_root_driver = {
         .ops = {
                 .add = acpi_pci_root_add,
                 .remove = acpi_pci_root_remove,
-                .start = acpi_pci_root_start,
                 },
 };
 
@@ -188,21 +186,6 @@ static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
         return AE_OK;
 }
 
-static void acpi_pci_bridge_scan(struct acpi_device *device)
-{
-        int status;
-        struct acpi_device *child = NULL;
-
-        if (device->flags.bus_address)
-                if (device->parent && device->parent->ops.bind) {
-                        status = device->parent->ops.bind(device);
-                        if (!status) {
-                                list_for_each_entry(child, &device->children, node)
-                                        acpi_pci_bridge_scan(child);
-                        }
-                }
-}
-
 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
 
 static acpi_status acpi_pci_run_osc(acpi_handle handle,
@@ -452,7 +435,7 @@ static int acpi_pci_root_add(struct acpi_device *device)
         int result;
         struct acpi_pci_root *root;
         acpi_handle handle;
-        struct acpi_device *child;
+        struct acpi_pci_driver *driver;
         u32 flags, base_flags;
         bool is_osc_granted = false;
 
@@ -603,21 +586,6 @@ static int acpi_pci_root_add(struct acpi_device *device)
                 goto out_del_root;
         }
 
-        /*
-         * Attach ACPI-PCI Context
-         * -----------------------
-         * Thus binding the ACPI and PCI devices.
-         */
-        result = acpi_pci_bind_root(device);
-        if (result)
-                goto out_del_root;
-
-        /*
-         * Scan and bind all _ADR-Based Devices
-         */
-        list_for_each_entry(child, &device->children, node)
-                acpi_pci_bridge_scan(child);
-
         /* ASPM setting */
         if (is_osc_granted) {
                 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM)
@@ -632,24 +600,6 @@ static int acpi_pci_root_add(struct acpi_device *device)
         if (device->wakeup.flags.run_wake)
                 device_set_run_wake(root->bus->bridge, true);
 
-        return 0;
-
-out_del_root:
-        mutex_lock(&acpi_pci_root_lock);
-        list_del(&root->node);
-        mutex_unlock(&acpi_pci_root_lock);
-
-        acpi_pci_irq_del_prt(root->segment, root->secondary.start);
-end:
-        kfree(root);
-        return result;
-}
-
-static int acpi_pci_root_start(struct acpi_device *device)
-{
-        struct acpi_pci_root *root = acpi_driver_data(device);
-        struct acpi_pci_driver *driver;
-
         if (system_state != SYSTEM_BOOTING)
                 pci_assign_unassigned_bus_resources(root->bus);
 
@@ -664,8 +614,17 @@ static int acpi_pci_root_start(struct acpi_device *device)
                 pci_enable_bridges(root->bus);
 
         pci_bus_add_devices(root->bus);
-
         return 0;
+
+out_del_root:
+        mutex_lock(&acpi_pci_root_lock);
+        list_del(&root->node);
+        mutex_unlock(&acpi_pci_root_lock);
+
+        acpi_pci_irq_del_prt(root->segment, root->secondary.start);
+end:
+        kfree(root);
+        return result;
 }
 
 static int acpi_pci_root_remove(struct acpi_device *device, int type)
@@ -699,7 +658,7 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
         return 0;
 }
 
-static int __init acpi_pci_root_init(void)
+int __init acpi_pci_root_init(void)
 {
         acpi_hest_init();
 
@@ -712,5 +671,3 @@ static int __init acpi_pci_root_init(void)
 
         return 0;
 }
-
-subsys_initcall(acpi_pci_root_init);
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index e83311bf1ebd..a24ee43e06e4 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -677,28 +677,6 @@ static int is_processor_present(acpi_handle handle)
         return 0;
 }
 
-static
-int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
-{
-        acpi_handle phandle;
-        struct acpi_device *pdev;
-
-
-        if (acpi_get_parent(handle, &phandle)) {
-                return -ENODEV;
-        }
-
-        if (acpi_bus_get_device(phandle, &pdev)) {
-                return -ENODEV;
-        }
-
-        if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
-                return -ENODEV;
-        }
-
-        return 0;
-}
-
 static void acpi_processor_hotplug_notify(acpi_handle handle,
                                           u32 event, void *data)
 {
@@ -721,12 +699,16 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
                 if (!acpi_bus_get_device(handle, &device))
                         break;
 
-                result = acpi_processor_device_add(handle, &device);
+                result = acpi_bus_add(handle);
                 if (result) {
                         acpi_handle_err(handle, "Unable to add the device\n");
                         break;
                 }
-
+                result = acpi_bus_get_device(handle, &device);
+                if (result) {
+                        acpi_handle_err(handle, "Missing device object\n");
+                        break;
+                }
                 ost_code = ACPI_OST_SC_SUCCESS;
                 break;
 
@@ -751,7 +733,7 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
                         break;
                 }
 
-                ej_event->handle = handle;
+                ej_event->device = device;
                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
                 acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
                                         (void *)ej_event);
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index c88be6c37c30..7d164a966b0d 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -116,24 +116,18 @@ 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_device *device;
-        acpi_handle handle = ej_event->handle;
+        struct acpi_device *device = ej_event->device;
+        acpi_handle handle = device->handle;
         acpi_handle temp;
         struct acpi_object_list arg_list;
         union acpi_object arg;
         acpi_status status = AE_OK;
         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
-        if (acpi_bus_get_device(handle, &device))
-                goto err_out;
-
-        if (!device)
-                goto err_out;
-
         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 
-        if (acpi_bus_trim(device, 1)) {
+        if (acpi_bus_trim(device)) {
                 printk(KERN_ERR PREFIX
                                 "Removing device failed\n");
                 goto err_out;
@@ -215,7 +209,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
                 goto err;
         }
 
-        ej_event->handle = acpi_device->handle;
+        ej_event->device = acpi_device;
         if (acpi_device->flags.eject_pending) {
                 /* event originated from ACPI eject notification */
                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
@@ -223,7 +217,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr,
         } else {
                 /* event originated from user */
                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
-                (void) acpi_evaluate_hotplug_ost(ej_event->handle,
+                (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
         }
 
@@ -494,7 +488,8 @@ static int acpi_bus_match(struct device *dev, struct device_driver *drv)
         struct acpi_device *acpi_dev = to_acpi_device(dev);
         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 
-        return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
+        return acpi_dev->flags.match_driver
+                && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 }
 
 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
@@ -570,7 +565,6 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device)
 }
 
 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
-static int acpi_start_single_object(struct acpi_device *);
 static int acpi_device_probe(struct device * dev)
 {
         struct acpi_device *acpi_dev = to_acpi_device(dev);
@@ -579,9 +573,6 @@ static int acpi_device_probe(struct device * dev)
 
         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
         if (!ret) {
-                if (acpi_dev->bus_ops.acpi_op_start)
-                        acpi_start_single_object(acpi_dev);
-
                 if (acpi_drv->ops.notify) {
                         ret = acpi_device_install_notify_handler(acpi_dev);
                         if (ret) {
@@ -704,7 +695,7 @@ end:
         return result;
 }
 
-static void acpi_device_unregister(struct acpi_device *device, int type)
+static void acpi_device_unregister(struct acpi_device *device)
 {
         mutex_lock(&acpi_device_lock);
         if (device->parent)
@@ -760,24 +751,6 @@ acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
         return 0;
 }
 
-static int acpi_start_single_object(struct acpi_device *device)
-{
-        int result = 0;
-        struct acpi_driver *driver;
-
-
-        if (!(driver = device->driver))
-                return 0;
-
-        if (driver->ops.start) {
-                result = driver->ops.start(device);
-                if (result && driver->ops.remove)
-                        driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
-        }
-
-        return result;
-}
-
 /**
  * acpi_bus_register_driver - register a driver with the ACPI bus
  * @driver: driver being registered
@@ -1395,33 +1368,9 @@ static int acpi_device_set_context(struct acpi_device *device)
         return -ENODEV;
 }
 
-static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
-{
-        if (!dev)
-                return -EINVAL;
-
-        dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
-        device_release_driver(&dev->dev);
-
-        if (!rmdevice)
-                return 0;
-
-        /*
-         * unbind _ADR-Based Devices when hot removal
-         */
-        if (dev->flags.bus_address) {
-                if ((dev->parent) && (dev->parent->ops.unbind))
-                        dev->parent->ops.unbind(dev);
-        }
-        acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
-
-        return 0;
-}
-
 static int acpi_add_single_object(struct acpi_device **child,
                                   acpi_handle handle, int type,
-                                  unsigned long long sta,
-                                  struct acpi_bus_ops *ops)
+                                  unsigned long long sta, bool match_driver)
 {
         int result;
         struct acpi_device *device;
@@ -1437,7 +1386,6 @@ static int acpi_add_single_object(struct acpi_device **child,
         device->device_type = type;
         device->handle = handle;
         device->parent = acpi_bus_get_parent(handle);
-        device->bus_ops = *ops; /* workround for not call .start */
         STRUCT_TO_INT(device->status) = sta;
 
         acpi_device_get_busid(device);
@@ -1488,16 +1436,9 @@ static int acpi_add_single_object(struct acpi_device **child,
         if ((result = acpi_device_set_context(device)))
                 goto end;
 
+        device->flags.match_driver = match_driver;
         result = acpi_device_register(device);
 
-        /*
-         * Bind _ADR-Based Devices when hot add
-         */
-        if (device->flags.bus_address) {
-                if (device->parent && device->parent->ops.bind)
-                        device->parent->ops.bind(device);
-        }
-
 end:
         if (!result) {
                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
@@ -1519,16 +1460,12 @@ end:
 
 static void acpi_bus_add_power_resource(acpi_handle handle)
 {
-        struct acpi_bus_ops ops = {
-                .acpi_op_add = 1,
-                .acpi_op_start = 1,
-        };
         struct acpi_device *device = NULL;
 
         acpi_bus_get_device(handle, &device);
         if (!device)
                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
-                                        ACPI_STA_DEFAULT, &ops);
+                                        ACPI_STA_DEFAULT, true);
 }
 
 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
@@ -1570,16 +1507,19 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type,
         return 0;
 }
 
-static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
-                                      void *context, void **return_value)
+static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
+                                      void *not_used, void **return_value)
 {
-        struct acpi_bus_ops *ops = context;
+        struct acpi_device *device = NULL;
         int type;
         unsigned long long sta;
-        struct acpi_device *device;
         acpi_status status;
         int result;
 
+        acpi_bus_get_device(handle, &device);
+        if (device)
+                goto out;
+
         result = acpi_bus_type_and_status(handle, &type, &sta);
         if (result)
                 return AE_OK;
@@ -1596,150 +1536,130 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
                 return AE_CTRL_DEPTH;
         }
 
-        /*
-         * We may already have an acpi_device from a previous enumeration.  If
-         * so, we needn't add it again, but we may still have to start it.
-         */
-        device = NULL;
-        acpi_bus_get_device(handle, &device);
-        if (ops->acpi_op_add && !device) {
-                acpi_add_single_object(&device, handle, type, sta, ops);
-                /* Is the device a known good platform device? */
-                if (device
-                    && !acpi_match_device_ids(device, acpi_platform_device_ids))
-                        acpi_create_platform_device(device);
-        }
-
+        acpi_add_single_object(&device, handle, type, sta,
+                               type == ACPI_BUS_TYPE_POWER);
         if (!device)
                 return AE_CTRL_DEPTH;
 
-        if (ops->acpi_op_start && !(ops->acpi_op_add)) {
-                status = acpi_start_single_object(device);
-                if (ACPI_FAILURE(status))
-                        return AE_CTRL_DEPTH;
-        }
+        device->flags.match_driver = true;
 
+ out:
         if (!*return_value)
                 *return_value = device;
+
         return AE_OK;
 }
 
-static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
-                         struct acpi_device **child)
+static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
+                                          void *not_used, void **ret_not_used)
+{
+        acpi_status status = AE_OK;
+        struct acpi_device *device;
+        unsigned long long sta_not_used;
+        int type_not_used;
+
+        /*
+         * 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))
+                return AE_OK;
+
+        if (acpi_bus_get_device(handle, &device))
+                return AE_CTRL_DEPTH;
+
+        if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
+                /* This is a known good platform device. */
+                acpi_create_platform_device(device);
+        } else if (device_attach(&device->dev) < 0) {
+                status = AE_CTRL_DEPTH;
+        }
+        return status;
+}
+
+static int acpi_bus_scan(acpi_handle handle)
 {
-        acpi_status status;
         void *device = NULL;
 
-        status = acpi_bus_check_add(handle, 0, ops, &device);
-        if (ACPI_SUCCESS(status))
+        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, ops, &device);
+                                    acpi_bus_check_add, NULL, NULL, &device);
 
-        if (child)
-                *child = device;
-
-        if (device)
-                return 0;
-        else
+        if (!device)
                 return -ENODEV;
+
+        if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
+                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
+                                    acpi_bus_device_attach, NULL, NULL, NULL);
+
+        return 0;
 }
 
-/*
- * acpi_bus_add and acpi_bus_start
+/**
+ * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
+ * @handle: Root of the namespace scope to scan.
  *
- * scan a given ACPI tree and (probably recently hot-plugged)
- * create and add or starts found devices.
+ * Scan a given ACPI tree (probably recently hot-plugged) and create and add
+ * found devices.
  *
- * If no devices were found -ENODEV is returned which does not
- * mean that this is 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/start an appropriate driver.
+ * If no devices were found, -ENODEV is returned, but it does not mean that
+ * 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.
  */
-
-int
-acpi_bus_add(struct acpi_device **child,
-             struct acpi_device *parent, acpi_handle handle, int type)
+int acpi_bus_add(acpi_handle handle)
 {
-        struct acpi_bus_ops ops;
+        int err;
 
-        memset(&ops, 0, sizeof(ops));
-        ops.acpi_op_add = 1;
+        err = acpi_bus_scan(handle);
+        if (err)
+                return err;
 
-        return acpi_bus_scan(handle, &ops, child);
+        acpi_update_all_gpes();
+        return 0;
 }
 EXPORT_SYMBOL(acpi_bus_add);
 
-int acpi_bus_start(struct acpi_device *device)
+static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
+                                          void *not_used, void **ret_not_used)
 {
-        struct acpi_bus_ops ops;
-        int result;
-
-        if (!device)
-                return -EINVAL;
-
-        memset(&ops, 0, sizeof(ops));
-        ops.acpi_op_start = 1;
-
-        result = acpi_bus_scan(device->handle, &ops, NULL);
-
-        acpi_update_all_gpes();
+        struct acpi_device *device = NULL;
 
-        return result;
+        if (!acpi_bus_get_device(handle, &device)) {
+                device->removal_type = ACPI_BUS_REMOVAL_EJECT;
+                device_release_driver(&device->dev);
+        }
+        return AE_OK;
 }
-EXPORT_SYMBOL(acpi_bus_start);
 
-int acpi_bus_trim(struct acpi_device *start, int rmdevice)
+static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
+                                   void *not_used, void **ret_not_used)
 {
-        acpi_status status;
-        struct acpi_device *parent, *child;
-        acpi_handle phandle, chandle;
-        acpi_object_type type;
-        u32 level = 1;
-        int err = 0;
-
-        parent = start;
-        phandle = start->handle;
-        child = chandle = NULL;
-
-        while ((level > 0) && parent && (!err)) {
-                status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
-                                              chandle, &chandle);
+        struct acpi_device *device = NULL;
 
-                /*
-                 * If this scope is exhausted then move our way back up.
-                 */
-                if (ACPI_FAILURE(status)) {
-                        level--;
-                        chandle = phandle;
-                        acpi_get_parent(phandle, &phandle);
-                        child = parent;
-                        parent = parent->parent;
-
-                        if (level == 0)
-                                err = acpi_bus_remove(child, rmdevice);
-                        else
-                                err = acpi_bus_remove(child, 1);
+        if (!acpi_bus_get_device(handle, &device))
+                acpi_device_unregister(device);
 
-                        continue;
-                }
+        return AE_OK;
+}
 
-                status = acpi_get_type(chandle, &type);
-                if (ACPI_FAILURE(status)) {
-                        continue;
-                }
-                /*
-                 * If there is a device corresponding to chandle then
-                 * parse it (depth-first).
-                 */
-                if (acpi_bus_get_device(chandle, &child) == 0) {
-                        level++;
-                        phandle = chandle;
-                        chandle = NULL;
-                        parent = child;
-                }
-                continue;
-        }
-        return err;
+int acpi_bus_trim(struct acpi_device *start)
+{
+        /*
+         * Execute acpi_bus_device_detach() as a post-order callback to detach
+         * all ACPI drivers from the device nodes being removed.
+         */
+        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
+                            acpi_bus_device_detach, NULL, NULL);
+        acpi_bus_device_detach(start->handle, 0, NULL, NULL);
+        /*
+         * Execute acpi_bus_remove() as a post-order callback to remove device
+         * nodes in the given namespace scope.
+         */
+        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);
+        return 0;
 }
 EXPORT_SYMBOL_GPL(acpi_bus_trim);
 
@@ -1747,11 +1667,6 @@ static int acpi_bus_scan_fixed(void)
 {
         int result = 0;
         struct acpi_device *device = NULL;
-        struct acpi_bus_ops ops;
-
-        memset(&ops, 0, sizeof(ops));
-        ops.acpi_op_add = 1;
-        ops.acpi_op_start = 1;
 
         /*
          * Enumerate all fixed-feature devices.
@@ -1759,16 +1674,14 @@ static int acpi_bus_scan_fixed(void)
         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
                 result = acpi_add_single_object(&device, NULL,
                                                 ACPI_BUS_TYPE_POWER_BUTTON,
-                                                ACPI_STA_DEFAULT,
-                                                &ops);
+                                                ACPI_STA_DEFAULT, true);
                 device_init_wakeup(&device->dev, true);
         }
 
         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
                 result = acpi_add_single_object(&device, NULL,
                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
-                                                ACPI_STA_DEFAULT,
-                                                &ops);
+                                                ACPI_STA_DEFAULT, true);
         }
 
         return result;
@@ -1777,11 +1690,6 @@ static int acpi_bus_scan_fixed(void)
 int __init acpi_scan_init(void)
 {
         int result;
-        struct acpi_bus_ops ops;
-
-        memset(&ops, 0, sizeof(ops));
-        ops.acpi_op_add = 1;
-        ops.acpi_op_start = 1;
 
         result = bus_register(&acpi_bus_type);
         if (result) {
@@ -1790,17 +1698,21 @@ int __init acpi_scan_init(void)
         }
 
         acpi_power_init();
+        acpi_pci_root_init();
 
         /*
          * Enumerate devices in the ACPI namespace.
          */
-        result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
+        result = acpi_bus_scan(ACPI_ROOT_OBJECT);
+        if (result)
+                return result;
 
+        result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
         if (!result)
                 result = acpi_bus_scan_fixed();
 
         if (result)
-                acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
+                acpi_device_unregister(acpi_root);
         else
                 acpi_update_all_gpes();