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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * scan.c - support for transforming the ACPI namespace into individual objects
  */
 
 #define pr_fmt(fmt) "ACPI: " fmt
 
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/acpi.h>
 #include <linux/acpi_iort.h>
 #include <linux/acpi_viot.h>
 #include <linux/iommu.h>
 #include <linux/signal.h>
 #include <linux/kthread.h>
 #include <linux/dmi.h>
 #include <linux/dma-map-ops.h>
 #include <linux/platform_data/x86/apple.h>
 #include <linux/pgtable.h>
 #include <linux/crc32.h>
 
 #include "internal.h"
 
 extern struct acpi_device *acpi_root;
 
 #define ACPI_BUS_CLASS          "system_bus"
 #define ACPI_BUS_HID            "LNXSYBUS"
 #define ACPI_BUS_DEVICE_NAME        "System Bus"
 
 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
 
 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
 
 static const char *dummy_hid = "device";
 
 static LIST_HEAD(acpi_dep_list);
 static DEFINE_MUTEX(acpi_dep_list_lock);
 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);
 static DEFINE_MUTEX(acpi_hp_context_lock);
 
 /*
  * The UART device described by the SPCR table is the only object which needs
  * special-casing. Everything else is covered by ACPI namespace paths in STAO
  * table.
  */
 static u64 spcr_uart_addr;
 
 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);
 
 void acpi_lock_hp_context(void)
 {
     mutex_lock(&acpi_hp_context_lock);
 }
 
 void acpi_unlock_hp_context(void)
 {
     mutex_unlock(&acpi_hp_context_lock);
 }
 
 void acpi_initialize_hp_context(struct acpi_device *adev,
                 struct acpi_hotplug_context *hp,
                 int (*notify)(struct acpi_device *, u32),
                 void (*uevent)(struct acpi_device *, u32))
 {
     acpi_lock_hp_context();
     hp->notify = notify;
     hp->uevent = uevent;
     acpi_set_hp_context(adev, hp);
     acpi_unlock_hp_context();
 }
 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
 
 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
 {
     if (!handler)
         return -EINVAL;
 
     list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
     return 0;
 }
 
 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
                        const char *hotplug_profile_name)
 {
     int error;
 
     error = acpi_scan_add_handler(handler);
     if (error)
         return error;
 
     acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
     return 0;
 }
 
 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 {
     struct acpi_device_physical_node *pn;
     bool offline = true;
     char *envp[] = { "EVENT=offline", NULL };
 
     /*
      * acpi_container_offline() calls this for all of the container's
      * children under the container's physical_node_lock lock.
      */
     mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
 
     list_for_each_entry(pn, &adev->physical_node_list, node)
         if (device_supports_offline(pn->dev) && !pn->dev->offline) {
             if (uevent)
                 kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp);
 
             offline = false;
             break;
         }
 
     mutex_unlock(&adev->physical_node_lock);
     return offline;
 }
 
 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
                     void **ret_p)
 {
     struct acpi_device *device = acpi_fetch_acpi_dev(handle);
     struct acpi_device_physical_node *pn;
     bool second_pass = (bool)data;
     acpi_status status = AE_OK;
 
     if (!device)
         return AE_OK;
 
     if (device->handler && !device->handler->hotplug.enabled) {
         *ret_p = &device->dev;
         return AE_SUPPORT;
     }
 
     mutex_lock(&device->physical_node_lock);
 
     list_for_each_entry(pn, &device->physical_node_list, node) {
         int ret;
 
         if (second_pass) {
             /* Skip devices offlined by the first pass. */
             if (pn->put_online)
                 continue;
         } else {
             pn->put_online = false;
         }
         ret = device_offline(pn->dev);
         if (ret >= 0) {
             pn->put_online = !ret;
         } else {
             *ret_p = pn->dev;
             if (second_pass) {
                 status = AE_ERROR;
                 break;
             }
         }
     }
 
     mutex_unlock(&device->physical_node_lock);
 
     return status;
 }
 
 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
                    void **ret_p)
 {
     struct acpi_device *device = acpi_fetch_acpi_dev(handle);
     struct acpi_device_physical_node *pn;
 
     if (!device)
         return AE_OK;
 
     mutex_lock(&device->physical_node_lock);
 
     list_for_each_entry(pn, &device->physical_node_list, node)
         if (pn->put_online) {
             device_online(pn->dev);
             pn->put_online = false;
         }
 
     mutex_unlock(&device->physical_node_lock);
 
     return AE_OK;
 }
 
 static int acpi_scan_try_to_offline(struct acpi_device *device)
 {
     acpi_handle handle = device->handle;
     struct device *errdev = NULL;
     acpi_status status;
 
     /*
      * Carry out two passes here and ignore errors in the first pass,
      * because if the devices in question are memory blocks and
      * CONFIG_MEMCG is set, one of the blocks may hold data structures
      * that the other blocks depend on, but it is not known in advance which
      * block holds them.
      *
      * If the first pass is successful, the second one isn't needed, though.
      */
     status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
                      NULL, acpi_bus_offline, (void *)false,
                      (void **)&errdev);
     if (status == AE_SUPPORT) {
         dev_warn(errdev, "Offline disabled.\n");
         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
                     acpi_bus_online, NULL, NULL, NULL);
         return -EPERM;
     }
     acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
     if (errdev) {
         errdev = NULL;
         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
                     NULL, acpi_bus_offline, (void *)true,
                     (void **)&errdev);
         if (!errdev)
             acpi_bus_offline(handle, 0, (void *)true,
                      (void **)&errdev);
 
         if (errdev) {
             dev_warn(errdev, "Offline failed.\n");
             acpi_bus_online(handle, 0, NULL, NULL);
             acpi_walk_namespace(ACPI_TYPE_ANY, handle,
                         ACPI_UINT32_MAX, acpi_bus_online,
                         NULL, NULL, NULL);
             return -EBUSY;
         }
     }
     return 0;
 }
 
 static int acpi_scan_hot_remove(struct acpi_device *device)
 {
     acpi_handle handle = device->handle;
     unsigned long long sta;
     acpi_status status;
 
     if (device->handler && device->handler->hotplug.demand_offline) {
         if (!acpi_scan_is_offline(device, true))
             return -EBUSY;
     } else {
         int error = acpi_scan_try_to_offline(device);
         if (error)
             return error;
     }
 
     acpi_handle_debug(handle, "Ejecting\n");
 
     acpi_bus_trim(device);
 
     acpi_evaluate_lck(handle, 0);
     /*
      * TBD: _EJD support.
      */
     status = acpi_evaluate_ej0(handle);
     if (status == AE_NOT_FOUND)
         return -ENODEV;
     else if (ACPI_FAILURE(status))
         return -EIO;
 
     /*
      * Verify if eject was indeed successful.  If not, log an error
      * message.  No need to call _OST since _EJ0 call was made OK.
      */
     status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
     if (ACPI_FAILURE(status)) {
         acpi_handle_warn(handle,
             "Status check after eject failed (0x%x)\n", status);
     } else if (sta & ACPI_STA_DEVICE_ENABLED) {
         acpi_handle_warn(handle,
             "Eject incomplete - status 0x%llx\n", sta);
     }
 
     return 0;
 }
 
 static int acpi_scan_device_not_present(struct acpi_device *adev)
 {
     if (!acpi_device_enumerated(adev)) {
         dev_warn(&adev->dev, "Still not present\n");
         return -EALREADY;
     }
     acpi_bus_trim(adev);
     return 0;
 }
 
 static int acpi_scan_device_check(struct acpi_device *adev)
 {
     int error;
 
     acpi_bus_get_status(adev);
     if (adev->status.present || adev->status.functional) {
         /*
          * This function is only called for device objects for which
          * matching scan handlers exist.  The only situation in which
          * the scan handler is not attached to this device object yet
          * is when the device has just appeared (either it wasn't
          * present at all before or it was removed and then added
          * again).
          */
         if (adev->handler) {
             dev_warn(&adev->dev, "Already enumerated\n");
             return -EALREADY;
         }
         error = acpi_bus_scan(adev->handle);
         if (error) {
             dev_warn(&adev->dev, "Namespace scan failure\n");
             return error;
         }
         if (!adev->handler) {
             dev_warn(&adev->dev, "Enumeration failure\n");
             error = -ENODEV;
         }
     } else {
         error = acpi_scan_device_not_present(adev);
     }
     return error;
 }
 
 static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used)
 {
     struct acpi_scan_handler *handler = adev->handler;
     int error;
 
     acpi_bus_get_status(adev);
     if (!(adev->status.present || adev->status.functional)) {
         acpi_scan_device_not_present(adev);
         return 0;
     }
     if (handler && handler->hotplug.scan_dependent)
         return handler->hotplug.scan_dependent(adev);
 
     error = acpi_bus_scan(adev->handle);
     if (error) {
         dev_warn(&adev->dev, "Namespace scan failure\n");
         return error;
     }
     return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL);
 }
 
 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
 {
     switch (type) {
     case ACPI_NOTIFY_BUS_CHECK:
         return acpi_scan_bus_check(adev, NULL);
     case ACPI_NOTIFY_DEVICE_CHECK:
         return acpi_scan_device_check(adev);
     case ACPI_NOTIFY_EJECT_REQUEST:
     case ACPI_OST_EC_OSPM_EJECT:
         if (adev->handler && !adev->handler->hotplug.enabled) {
             dev_info(&adev->dev, "Eject disabled\n");
             return -EPERM;
         }
         acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
                   ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
         return acpi_scan_hot_remove(adev);
     }
     return -EINVAL;
 }
 
 void acpi_device_hotplug(struct acpi_device *adev, u32 src)
 {
     u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
     int error = -ENODEV;
 
     lock_device_hotplug();
     mutex_lock(&acpi_scan_lock);
 
     /*
      * The device object's ACPI handle cannot become invalid as long as we
      * are holding acpi_scan_lock, but it might have become invalid before
      * that lock was acquired.
      */
     if (adev->handle == INVALID_ACPI_HANDLE)
         goto err_out;
 
     if (adev->flags.is_dock_station) {
         error = dock_notify(adev, src);
     } else if (adev->flags.hotplug_notify) {
         error = acpi_generic_hotplug_event(adev, src);
     } else {
         int (*notify)(struct acpi_device *, u32);
 
         acpi_lock_hp_context();
         notify = adev->hp ? adev->hp->notify : NULL;
         acpi_unlock_hp_context();
         /*
          * There may be additional notify handlers for device objects
          * without the .event() callback, so ignore them here.
          */
         if (notify)
             error = notify(adev, src);
         else
             goto out;
     }
     switch (error) {
     case 0:
         ost_code = ACPI_OST_SC_SUCCESS;
         break;
     case -EPERM:
         ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
         break;
     case -EBUSY:
         ost_code = ACPI_OST_SC_DEVICE_BUSY;
         break;
     default:
         ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
         break;
     }
 
  err_out:
     acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
 
  out:
     acpi_bus_put_acpi_device(adev);
     mutex_unlock(&acpi_scan_lock);
     unlock_device_hotplug();
 }
 
 static void acpi_free_power_resources_lists(struct acpi_device *device)
 {
     int i;
 
     if (device->wakeup.flags.valid)
         acpi_power_resources_list_free(&device->wakeup.resources);
 
     if (!device->power.flags.power_resources)
         return;
 
     for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
         struct acpi_device_power_state *ps = &device->power.states[i];
         acpi_power_resources_list_free(&ps->resources);
     }
 }
 
 static void acpi_device_release(struct device *dev)
 {
     struct acpi_device *acpi_dev = to_acpi_device(dev);
 
     acpi_free_properties(acpi_dev);
     acpi_free_pnp_ids(&acpi_dev->pnp);
     acpi_free_power_resources_lists(acpi_dev);
     kfree(acpi_dev);
 }
 
 static void acpi_device_del(struct acpi_device *device)
 {
     struct acpi_device_bus_id *acpi_device_bus_id;
 
     mutex_lock(&acpi_device_lock);
 
     list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
         if (!strcmp(acpi_device_bus_id->bus_id,
                 acpi_device_hid(device))) {
             ida_free(&acpi_device_bus_id->instance_ida,
                  device->pnp.instance_no);
             if (ida_is_empty(&acpi_device_bus_id->instance_ida)) {
                 list_del(&acpi_device_bus_id->node);
                 kfree_const(acpi_device_bus_id->bus_id);
                 kfree(acpi_device_bus_id);
             }
             break;
         }
 
     list_del(&device->wakeup_list);
 
     mutex_unlock(&acpi_device_lock);
 
     acpi_power_add_remove_device(device, false);
     acpi_device_remove_files(device);
     if (device->remove)
         device->remove(device);
 
     device_del(&device->dev);
 }
 
 static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
 
 static LIST_HEAD(acpi_device_del_list);
 static DEFINE_MUTEX(acpi_device_del_lock);
 
 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 {
     for (;;) {
         struct acpi_device *adev;
 
         mutex_lock(&acpi_device_del_lock);
 
         if (list_empty(&acpi_device_del_list)) {
             mutex_unlock(&acpi_device_del_lock);
             break;
         }
         adev = list_first_entry(&acpi_device_del_list,
                     struct acpi_device, del_list);
         list_del(&adev->del_list);
 
         mutex_unlock(&acpi_device_del_lock);
 
         blocking_notifier_call_chain(&acpi_reconfig_chain,
                          ACPI_RECONFIG_DEVICE_REMOVE, adev);
 
         acpi_device_del(adev);
         /*
          * Drop references to all power resources that might have been
          * used by the device.
          */
         acpi_power_transition(adev, ACPI_STATE_D3_COLD);
         acpi_dev_put(adev);
     }
 }
 
 /**
  * acpi_scan_drop_device - Drop an ACPI device object.
  * @handle: Handle of an ACPI namespace node, not used.
  * @context: Address of the ACPI device object to drop.
  *
  * This is invoked by acpi_ns_delete_node() during the removal of the ACPI
  * namespace node the device object pointed to by @context is attached to.
  *
  * The unregistration is carried out asynchronously to avoid running
  * acpi_device_del() under the ACPICA's namespace mutex and the list is used to
  * ensure the correct ordering (the device objects must be unregistered in the
  * same order in which the corresponding namespace nodes are deleted).
  */
 static void acpi_scan_drop_device(acpi_handle handle, void *context)
 {
     static DECLARE_WORK(work, acpi_device_del_work_fn);
     struct acpi_device *adev = context;
 
     mutex_lock(&acpi_device_del_lock);
 
     /*
      * Use the ACPI hotplug workqueue which is ordered, so this work item
      * won't run after any hotplug work items submitted subsequently.  That
      * prevents attempts to register device objects identical to those being
      * deleted from happening concurrently (such attempts result from
      * hotplug events handled via the ACPI hotplug workqueue).  It also will
      * run after all of the work items submitted previously, which helps
      * those work items to ensure that they are not accessing stale device
      * objects.
      */
     if (list_empty(&acpi_device_del_list))
         acpi_queue_hotplug_work(&work);
 
     list_add_tail(&adev->del_list, &acpi_device_del_list);
     /* Make acpi_ns_validate_handle() return NULL for this handle. */
     adev->handle = INVALID_ACPI_HANDLE;
 
     mutex_unlock(&acpi_device_del_lock);
 }
 
 static struct acpi_device *handle_to_device(acpi_handle handle,
                         void (*callback)(void *))
 {
     struct acpi_device *adev = NULL;
     acpi_status status;
 
     status = acpi_get_data_full(handle, acpi_scan_drop_device,
                     (void **)&adev, callback);
     if (ACPI_FAILURE(status) || !adev) {
         acpi_handle_debug(handle, "No context!\n");
         return NULL;
     }
     return adev;
 }
 
 /**
  * acpi_fetch_acpi_dev - Retrieve ACPI device object.
  * @handle: ACPI handle associated with the requested ACPI device object.
  *
  * Return a pointer to the ACPI device object associated with @handle, if
  * present, or NULL otherwise.
  */
 struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle)
 {
     return handle_to_device(handle, NULL);
 }
 EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev);
 
 static void get_acpi_device(void *dev)
 {
     acpi_dev_get(dev);
 }
 
 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 {
     return handle_to_device(handle, get_acpi_device);
 }
 EXPORT_SYMBOL_GPL(acpi_bus_get_acpi_device);
 
 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
 {
     struct acpi_device_bus_id *acpi_device_bus_id;
 
     /* Find suitable bus_id and instance number in acpi_bus_id_list. */
     list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
         if (!strcmp(acpi_device_bus_id->bus_id, dev_id))
             return acpi_device_bus_id;
     }
     return NULL;
 }
 
 static int acpi_device_set_name(struct acpi_device *device,
                 struct acpi_device_bus_id *acpi_device_bus_id)
 {
     struct ida *instance_ida = &acpi_device_bus_id->instance_ida;
     int result;
 
     result = ida_alloc(instance_ida, GFP_KERNEL);
     if (result < 0)
         return result;
 
     device->pnp.instance_no = result;
     dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result);
     return 0;
 }
 
 static int acpi_tie_acpi_dev(struct acpi_device *adev)
 {
     acpi_handle handle = adev->handle;
     acpi_status status;
 
     if (!handle)
         return 0;
 
     status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
     if (ACPI_FAILURE(status)) {
         acpi_handle_err(handle, "Unable to attach device data\n");
         return -ENODEV;
     }
 
     return 0;
 }
 
 static void acpi_store_pld_crc(struct acpi_device *adev)
 {
     struct acpi_pld_info *pld;
     acpi_status status;
 
     status = acpi_get_physical_device_location(adev->handle, &pld);
     if (ACPI_FAILURE(status))
         return;
 
     adev->pld_crc = crc32(~0, pld, sizeof(*pld));
     ACPI_FREE(pld);
 }
 
 static int __acpi_device_add(struct acpi_device *device,
                  void (*release)(struct device *))
 {
     struct acpi_device_bus_id *acpi_device_bus_id;
     int result;
 
     /*
      * Linkage
      * -------
      * Link this device to its parent and siblings.
      */
     INIT_LIST_HEAD(&device->wakeup_list);
     INIT_LIST_HEAD(&device->physical_node_list);
     INIT_LIST_HEAD(&device->del_list);
     mutex_init(&device->physical_node_lock);
 
     mutex_lock(&acpi_device_lock);
 
     acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device));
     if (acpi_device_bus_id) {
         result = acpi_device_set_name(device, acpi_device_bus_id);
         if (result)
             goto err_unlock;
     } else {
         acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id),
                          GFP_KERNEL);
         if (!acpi_device_bus_id) {
             result = -ENOMEM;
             goto err_unlock;
         }
         acpi_device_bus_id->bus_id =
             kstrdup_const(acpi_device_hid(device), GFP_KERNEL);
         if (!acpi_device_bus_id->bus_id) {
             kfree(acpi_device_bus_id);
             result = -ENOMEM;
             goto err_unlock;
         }
 
         ida_init(&acpi_device_bus_id->instance_ida);
 
         result = acpi_device_set_name(device, acpi_device_bus_id);
         if (result) {
             kfree_const(acpi_device_bus_id->bus_id);
             kfree(acpi_device_bus_id);
             goto err_unlock;
         }
 
         list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
     }
 
     if (device->wakeup.flags.valid)
         list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 
     acpi_store_pld_crc(device);
 
     mutex_unlock(&acpi_device_lock);
 
     if (device->parent)
         device->dev.parent = &device->parent->dev;
 
     device->dev.bus = &acpi_bus_type;
     device->dev.release = release;
     result = device_add(&device->dev);
     if (result) {
         dev_err(&device->dev, "Error registering device\n");
         goto err;
     }
 
     result = acpi_device_setup_files(device);
     if (result)
         pr_err("Error creating sysfs interface for device %s\n",
                dev_name(&device->dev));
 
     return 0;
 
 err:
     mutex_lock(&acpi_device_lock);
 
     list_del(&device->wakeup_list);
 
 err_unlock:
     mutex_unlock(&acpi_device_lock);
 
     acpi_detach_data(device->handle, acpi_scan_drop_device);
 
     return result;
 }
 
 int acpi_device_add(struct acpi_device *adev, void (*release)(struct device *))
 {
     int ret;
 
     ret = acpi_tie_acpi_dev(adev);
     if (ret)
         return ret;
 
     return __acpi_device_add(adev, release);
 }
 
 /* --------------------------------------------------------------------------
                                  Device Enumeration
    -------------------------------------------------------------------------- */
 static bool acpi_info_matches_ids(struct acpi_device_info *info,
                   const char * const ids[])
 {
     struct acpi_pnp_device_id_list *cid_list = NULL;
     int i, index;
 
     if (!(info->valid & ACPI_VALID_HID))
         return false;
 
     index = match_string(ids, -1, info->hardware_id.string);
     if (index >= 0)
         return true;
 
     if (info->valid & ACPI_VALID_CID)
         cid_list = &info->compatible_id_list;
 
     if (!cid_list)
         return false;
 
     for (i = 0; i < cid_list->count; i++) {
         index = match_string(ids, -1, cid_list->ids[i].string);
         if (index >= 0)
             return true;
     }
 
     return false;
 }
 
 /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */
 static const char * const acpi_ignore_dep_ids[] = {
     "PNP0D80", /* Windows-compatible System Power Management Controller */
     "INT33BD", /* Intel Baytrail Mailbox Device */
     NULL
 };
 
 /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */
 static const char * const acpi_honor_dep_ids[] = {
     "INT3472", /* Camera sensor PMIC / clk and regulator info */
     NULL
 };
 
 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 {
     struct acpi_device *device;
     acpi_status status;
 
     /*
      * 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)
         return acpi_root;
 
     do {
         status = acpi_get_parent(handle, &handle);
         if (ACPI_FAILURE(status))
             return status == AE_NULL_ENTRY ? NULL : acpi_root;
 
         device = acpi_fetch_acpi_dev(handle);
     } while (!device);
     return device;
 }
 
 acpi_status
 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 {
     acpi_status status;
     acpi_handle tmp;
     struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
     union acpi_object *obj;
 
     status = acpi_get_handle(handle, "_EJD", &tmp);
     if (ACPI_FAILURE(status))
         return status;
 
     status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
     if (ACPI_SUCCESS(status)) {
         obj = buffer.pointer;
         status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
                      ejd);
         kfree(buffer.pointer);
     }
     return status;
 }
 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 
 static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev)
 {
     acpi_handle handle = dev->handle;
     struct acpi_device_wakeup *wakeup = &dev->wakeup;
     struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
     union acpi_object *package = NULL;
     union acpi_object *element = NULL;
     acpi_status status;
     int err = -ENODATA;
 
     INIT_LIST_HEAD(&wakeup->resources);
 
     /* _PRW */
     status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
     if (ACPI_FAILURE(status)) {
         acpi_handle_info(handle, "_PRW evaluation failed: %s\n",
                  acpi_format_exception(status));
         return err;
     }
 
     package = (union acpi_object *)buffer.pointer;
 
     if (!package || package->package.count < 2)
         goto out;
 
     element = &(package->package.elements[0]);
     if (!element)
         goto out;
 
     if (element->type == ACPI_TYPE_PACKAGE) {
         if ((element->package.count < 2) ||
             (element->package.elements[0].type !=
              ACPI_TYPE_LOCAL_REFERENCE)
             || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
             goto out;
 
         wakeup->gpe_device =
             element->package.elements[0].reference.handle;
         wakeup->gpe_number =
             (u32) element->package.elements[1].integer.value;
     } else if (element->type == ACPI_TYPE_INTEGER) {
         wakeup->gpe_device = NULL;
         wakeup->gpe_number = element->integer.value;
     } else {
         goto out;
     }
 
     element = &(package->package.elements[1]);
     if (element->type != ACPI_TYPE_INTEGER)
         goto out;
 
     wakeup->sleep_state = element->integer.value;
 
     err = acpi_extract_power_resources(package, 2, &wakeup->resources);
     if (err)
         goto out;
 
     if (!list_empty(&wakeup->resources)) {
         int sleep_state;
 
         err = acpi_power_wakeup_list_init(&wakeup->resources,
                           &sleep_state);
         if (err) {
             acpi_handle_warn(handle, "Retrieving current states "
                      "of wakeup power resources failed\n");
             acpi_power_resources_list_free(&wakeup->resources);
             goto out;
         }
         if (sleep_state < wakeup->sleep_state) {
             acpi_handle_warn(handle, "Overriding _PRW sleep state "
                      "(S%d) by S%d from power resources\n",
                      (int)wakeup->sleep_state, sleep_state);
             wakeup->sleep_state = sleep_state;
         }
     }
 
  out:
     kfree(buffer.pointer);
     return err;
 }
 
 static bool acpi_wakeup_gpe_init(struct acpi_device *device)
 {
     static const struct acpi_device_id button_device_ids[] = {
         {"PNP0C0C", 0},     /* Power button */
         {"PNP0C0D", 0},     /* Lid */
         {"PNP0C0E", 0},     /* Sleep button */
         {"", 0},
     };
     struct acpi_device_wakeup *wakeup = &device->wakeup;
     acpi_status status;
 
     wakeup->flags.notifier_present = 0;
 
     /* Power button, Lid switch always enable wakeup */
     if (!acpi_match_device_ids(device, button_device_ids)) {
         if (!acpi_match_device_ids(device, &button_device_ids[1])) {
             /* Do not use Lid/sleep button for S5 wakeup */
             if (wakeup->sleep_state == ACPI_STATE_S5)
                 wakeup->sleep_state = ACPI_STATE_S4;
         }
         acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
         device_set_wakeup_capable(&device->dev, true);
         return true;
     }
 
     status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
                      wakeup->gpe_number);
     return ACPI_SUCCESS(status);
 }
 
 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 {
     int err;
 
     /* Presence of _PRW indicates wake capable */
     if (!acpi_has_method(device->handle, "_PRW"))
         return;
 
     err = acpi_bus_extract_wakeup_device_power_package(device);
     if (err) {
         dev_err(&device->dev, "Unable to extract wakeup power resources");
         return;
     }
 
     device->wakeup.flags.valid = acpi_wakeup_gpe_init(device);
     device->wakeup.prepare_count = 0;
     /*
      * Call _PSW/_DSW object to disable its ability to wake the sleeping
      * system for the ACPI device with the _PRW object.
      * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW.
      * So it is necessary to call _DSW object first. Only when it is not
      * present will the _PSW object used.
      */
     err = acpi_device_sleep_wake(device, 0, 0, 0);
     if (err)
         pr_debug("error in _DSW or _PSW evaluation\n");
 }
 
 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
 {
     struct acpi_device_power_state *ps = &device->power.states[state];
     char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
     struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
     acpi_status status;
 
     INIT_LIST_HEAD(&ps->resources);
 
     /* Evaluate "_PRx" to get referenced power resources */
     status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
     if (ACPI_SUCCESS(status)) {
         union acpi_object *package = buffer.pointer;
 
         if (buffer.length && package
             && package->type == ACPI_TYPE_PACKAGE
             && package->package.count)
             acpi_extract_power_resources(package, 0, &ps->resources);
 
         ACPI_FREE(buffer.pointer);
     }
 
     /* Evaluate "_PSx" to see if we can do explicit sets */
     pathname[2] = 'S';
     if (acpi_has_method(device->handle, pathname))
         ps->flags.explicit_set = 1;
 
     /* State is valid if there are means to put the device into it. */
     if (!list_empty(&ps->resources) || ps->flags.explicit_set)
         ps->flags.valid = 1;
 
     ps->power = -1;     /* Unknown - driver assigned */
     ps->latency = -1;   /* Unknown - driver assigned */
 }
 
 static void acpi_bus_get_power_flags(struct acpi_device *device)
 {
     unsigned long long dsc = ACPI_STATE_D0;
     u32 i;
 
     /* Presence of _PS0|_PR0 indicates 'power manageable' */
     if (!acpi_has_method(device->handle, "_PS0") &&
         !acpi_has_method(device->handle, "_PR0"))
         return;
 
     device->flags.power_manageable = 1;
 
     /*
      * Power Management Flags
      */
     if (acpi_has_method(device->handle, "_PSC"))
         device->power.flags.explicit_get = 1;
 
     if (acpi_has_method(device->handle, "_IRC"))
         device->power.flags.inrush_current = 1;
 
     if (acpi_has_method(device->handle, "_DSW"))
         device->power.flags.dsw_present = 1;
 
     acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc);
     device->power.state_for_enumeration = dsc;
 
     /*
      * Enumerate supported power management states
      */
     for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
         acpi_bus_init_power_state(device, i);
 
     INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
 
     /* Set the defaults for D0 and D3hot (always supported). */
     device->power.states[ACPI_STATE_D0].flags.valid = 1;
     device->power.states[ACPI_STATE_D0].power = 100;
     device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
 
     /*
      * Use power resources only if the D0 list of them is populated, because
      * some platforms may provide _PR3 only to indicate D3cold support and
      * in those cases the power resources list returned by it may be bogus.
      */
     if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) {
         device->power.flags.power_resources = 1;
         /*
          * D3cold is supported if the D3hot list of power resources is
          * not empty.
          */
         if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
             device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
     }
 
     if (acpi_bus_init_power(device))
         device->flags.power_manageable = 0;
 }
 
 static void acpi_bus_get_flags(struct acpi_device *device)
 {
     /* Presence of _STA indicates 'dynamic_status' */
     if (acpi_has_method(device->handle, "_STA"))
         device->flags.dynamic_status = 1;
 
     /* Presence of _RMV indicates 'removable' */
     if (acpi_has_method(device->handle, "_RMV"))
         device->flags.removable = 1;
 
     /* Presence of _EJD|_EJ0 indicates 'ejectable' */
     if (acpi_has_method(device->handle, "_EJD") ||
         acpi_has_method(device->handle, "_EJ0"))
         device->flags.ejectable = 1;
 }
 
 static void acpi_device_get_busid(struct acpi_device *device)
 {
     char bus_id[5] = { '?', 0 };
     struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
     int i = 0;
 
     /*
      * Bus ID
      * ------
      * The device's Bus ID is simply the object name.
      * TBD: Shouldn't this value be unique (within the ACPI namespace)?
      */
     if (ACPI_IS_ROOT_DEVICE(device)) {
         strcpy(device->pnp.bus_id, "ACPI");
         return;
     }
 
     switch (device->device_type) {
     case ACPI_BUS_TYPE_POWER_BUTTON:
         strcpy(device->pnp.bus_id, "PWRF");
         break;
     case ACPI_BUS_TYPE_SLEEP_BUTTON:
         strcpy(device->pnp.bus_id, "SLPF");
         break;
     case ACPI_BUS_TYPE_ECDT_EC:
         strcpy(device->pnp.bus_id, "ECDT");
         break;
     default:
         acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
         /* Clean up trailing underscores (if any) */
         for (i = 3; i > 1; i--) {
             if (bus_id[i] == '_')
                 bus_id[i] = '\0';
             else
                 break;
         }
         strcpy(device->pnp.bus_id, bus_id);
         break;
     }
 }
 
 /*
  * acpi_ata_match - see if an acpi object is an ATA device
  *
  * If an acpi object has one of the ACPI ATA methods defined,
  * then we can safely call it an ATA device.
  */
 bool acpi_ata_match(acpi_handle handle)
 {
     return acpi_has_method(handle, "_GTF") ||
            acpi_has_method(handle, "_GTM") ||
            acpi_has_method(handle, "_STM") ||
            acpi_has_method(handle, "_SDD");
 }
 
 /*
  * acpi_bay_match - see if an acpi object is an ejectable driver bay
  *
  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
  * then we can safely call it an ejectable drive bay
  */
 bool acpi_bay_match(acpi_handle handle)
 {
     acpi_handle phandle;
 
     if (!acpi_has_method(handle, "_EJ0"))
         return false;
     if (acpi_ata_match(handle))
         return true;
     if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
         return false;
 
     return acpi_ata_match(phandle);
 }
 
 bool acpi_device_is_battery(struct acpi_device *adev)
 {
     struct acpi_hardware_id *hwid;
 
     list_for_each_entry(hwid, &adev->pnp.ids, list)
         if (!strcmp("PNP0C0A", hwid->id))
             return true;
 
     return false;
 }
 
 static bool is_ejectable_bay(struct acpi_device *adev)
 {
     acpi_handle handle = adev->handle;
 
     if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
         return true;
 
     return acpi_bay_match(handle);
 }
 
 /*
  * acpi_dock_match - see if an acpi object has a _DCK method
  */
 bool acpi_dock_match(acpi_handle handle)
 {
     return acpi_has_method(handle, "_DCK");
 }
 
 static acpi_status
 acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
               void **return_value)
 {
     long *cap = context;
 
     if (acpi_has_method(handle, "_BCM") &&
         acpi_has_method(handle, "_BCL")) {
         acpi_handle_debug(handle, "Found generic backlight support\n");
         *cap |= ACPI_VIDEO_BACKLIGHT;
         /* We have backlight support, no need to scan further */
         return AE_CTRL_TERMINATE;
     }
     return 0;
 }
 
 /* Returns true if the ACPI object is a video device which can be
  * handled by video.ko.
  * The device will get a Linux specific CID added in scan.c to
  * identify the device as an ACPI graphics device
  * Be aware that the graphics device may not be physically present
  * Use acpi_video_get_capabilities() to detect general ACPI video
  * capabilities of present cards
  */
 long acpi_is_video_device(acpi_handle handle)
 {
     long video_caps = 0;
 
     /* Is this device able to support video switching ? */
     if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
         video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
 
     /* Is this device able to retrieve a video ROM ? */
     if (acpi_has_method(handle, "_ROM"))
         video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
 
     /* Is this device able to configure which video head to be POSTed ? */
     if (acpi_has_method(handle, "_VPO") &&
         acpi_has_method(handle, "_GPD") &&
         acpi_has_method(handle, "_SPD"))
         video_caps |= ACPI_VIDEO_DEVICE_POSTING;
 
     /* Only check for backlight functionality if one of the above hit. */
     if (video_caps)
         acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
                     ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
                     &video_caps, NULL);
 
     return video_caps;
 }
 EXPORT_SYMBOL(acpi_is_video_device);
 
 const char *acpi_device_hid(struct acpi_device *device)
 {
     struct acpi_hardware_id *hid;
 
     if (list_empty(&device->pnp.ids))
         return dummy_hid;
 
     hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
     return hid->id;
 }
 EXPORT_SYMBOL(acpi_device_hid);
 
 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
 {
     struct acpi_hardware_id *id;
 
     id = kmalloc(sizeof(*id), GFP_KERNEL);
     if (!id)
         return;
 
     id->id = kstrdup_const(dev_id, GFP_KERNEL);
     if (!id->id) {
         kfree(id);
         return;
     }
 
     list_add_tail(&id->list, &pnp->ids);
     pnp->type.hardware_id = 1;
 }
 
 /*
  * Old IBM workstations have a DSDT bug wherein the SMBus object
  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
  * prefix.  Work around this.
  */
 static bool acpi_ibm_smbus_match(acpi_handle handle)
 {
     char node_name[ACPI_PATH_SEGMENT_LENGTH];
     struct acpi_buffer path = { sizeof(node_name), node_name };
 
     if (!dmi_name_in_vendors("IBM"))
         return false;
 
     /* Look for SMBS object */
     if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
         strcmp("SMBS", path.pointer))
         return false;
 
     /* Does it have the necessary (but misnamed) methods? */
     if (acpi_has_method(handle, "SBI") &&
         acpi_has_method(handle, "SBR") &&
         acpi_has_method(handle, "SBW"))
         return true;
 
     return false;
 }
 
 static bool acpi_object_is_system_bus(acpi_handle handle)
 {
     acpi_handle tmp;
 
     if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
         tmp == handle)
         return true;
     if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
         tmp == handle)
         return true;
 
     return false;
 }
 
 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
                  int device_type)
 {
     struct acpi_device_info *info = NULL;
     struct acpi_pnp_device_id_list *cid_list;
     int i;
 
     switch (device_type) {
     case ACPI_BUS_TYPE_DEVICE:
         if (handle == ACPI_ROOT_OBJECT) {
             acpi_add_id(pnp, ACPI_SYSTEM_HID);
             break;
         }
 
         acpi_get_object_info(handle, &info);
         if (!info) {
             pr_err("%s: Error reading device info\n", __func__);
             return;
         }
 
         if (info->valid & ACPI_VALID_HID) {
             acpi_add_id(pnp, info->hardware_id.string);
             pnp->type.platform_id = 1;
         }
         if (info->valid & ACPI_VALID_CID) {
             cid_list = &info->compatible_id_list;
             for (i = 0; i < cid_list->count; i++)
                 acpi_add_id(pnp, cid_list->ids[i].string);
         }
         if (info->valid & ACPI_VALID_ADR) {
             pnp->bus_address = info->address;
             pnp->type.bus_address = 1;
         }
         if (info->valid & ACPI_VALID_UID)
             pnp->unique_id = kstrdup(info->unique_id.string,
                             GFP_KERNEL);
         if (info->valid & ACPI_VALID_CLS)
             acpi_add_id(pnp, info->class_code.string);
 
         kfree(info);
 
         /*
          * Some devices don't reliably have _HIDs & _CIDs, so add
          * synthetic HIDs to make sure drivers can find them.
          */
         if (acpi_is_video_device(handle))
             acpi_add_id(pnp, ACPI_VIDEO_HID);
         else if (acpi_bay_match(handle))
             acpi_add_id(pnp, ACPI_BAY_HID);
         else if (acpi_dock_match(handle))
             acpi_add_id(pnp, ACPI_DOCK_HID);
         else if (acpi_ibm_smbus_match(handle))
             acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
         else if (list_empty(&pnp->ids) &&
              acpi_object_is_system_bus(handle)) {
             /* \_SB, \_TZ, LNXSYBUS */
             acpi_add_id(pnp, ACPI_BUS_HID);
             strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
             strcpy(pnp->device_class, ACPI_BUS_CLASS);
         }
 
         break;
     case ACPI_BUS_TYPE_POWER:
         acpi_add_id(pnp, ACPI_POWER_HID);
         break;
     case ACPI_BUS_TYPE_PROCESSOR:
         acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
         break;
     case ACPI_BUS_TYPE_THERMAL:
         acpi_add_id(pnp, ACPI_THERMAL_HID);
         break;
     case ACPI_BUS_TYPE_POWER_BUTTON:
         acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
         break;
     case ACPI_BUS_TYPE_SLEEP_BUTTON:
         acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
         break;
     case ACPI_BUS_TYPE_ECDT_EC:
         acpi_add_id(pnp, ACPI_ECDT_HID);
         break;
     }
 }
 
 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
 {
     struct acpi_hardware_id *id, *tmp;
 
     list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
         kfree_const(id->id);
         kfree(id);
     }
     kfree(pnp->unique_id);
 }
 
 /**
  * acpi_dma_supported - Check DMA support for the specified device.
  * @adev: The pointer to acpi device
  *
  * Return false if DMA is not supported. Otherwise, return true
  */
 bool acpi_dma_supported(const struct acpi_device *adev)
 {
     if (!adev)
         return false;
 
     if (adev->flags.cca_seen)
         return true;
 
     /*
     * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
     * DMA on "Intel platforms".  Presumably that includes all x86 and
     * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
     */
     if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
         return true;
 
     return false;
 }
 
 /**
  * acpi_get_dma_attr - Check the supported DMA attr for the specified device.
  * @adev: The pointer to acpi device
  *
  * Return enum dev_dma_attr.
  */
 enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
 {
     if (!acpi_dma_supported(adev))
         return DEV_DMA_NOT_SUPPORTED;
 
     if (adev->flags.coherent_dma)
         return DEV_DMA_COHERENT;
     else
         return DEV_DMA_NON_COHERENT;
 }
 
 /**
  * acpi_dma_get_range() - Get device DMA parameters.
  *
  * @dev: device to configure
  * @dma_addr: pointer device DMA address result
  * @offset: pointer to the DMA offset result
  * @size: pointer to DMA range size result
  *
  * Evaluate DMA regions and return respectively DMA region start, offset
  * and size in dma_addr, offset and size on parsing success; it does not
  * update the passed in values on failure.
  *
  * Return 0 on success, < 0 on failure.
  */
 int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
                u64 *size)
 {
     struct acpi_device *adev;
     LIST_HEAD(list);
     struct resource_entry *rentry;
     int ret;
     struct device *dma_dev = dev;
     u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0;
 
     /*
      * Walk the device tree chasing an ACPI companion with a _DMA
      * object while we go. Stop if we find a device with an ACPI
      * companion containing a _DMA method.
      */
     do {
         adev = ACPI_COMPANION(dma_dev);
         if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA))
             break;
 
         dma_dev = dma_dev->parent;
     } while (dma_dev);
 
     if (!dma_dev)
         return -ENODEV;
 
     if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) {
         acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n");
         return -EINVAL;
     }
 
     ret = acpi_dev_get_dma_resources(adev, &list);
     if (ret > 0) {
         list_for_each_entry(rentry, &list, node) {
             if (dma_offset && rentry->offset != dma_offset) {
                 ret = -EINVAL;
                 dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n");
                 goto out;
             }
             dma_offset = rentry->offset;
 
             /* Take lower and upper limits */
             if (rentry->res->start < dma_start)
                 dma_start = rentry->res->start;
             if (rentry->res->end > dma_end)
                 dma_end = rentry->res->end;
         }
 
         if (dma_start >= dma_end) {
             ret = -EINVAL;
             dev_dbg(dma_dev, "Invalid DMA regions configuration\n");
             goto out;
         }
 
         *dma_addr = dma_start - dma_offset;
         len = dma_end - dma_start;
         *size = max(len, len + 1);
         *offset = dma_offset;
     }
  out:
     acpi_dev_free_resource_list(&list);
 
     return ret >= 0 ? 0 : ret;
 }
 
 #ifdef CONFIG_IOMMU_API
 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
                struct fwnode_handle *fwnode,
                const struct iommu_ops *ops)
 {
     int ret = iommu_fwspec_init(dev, fwnode, ops);
 
     if (!ret)
         ret = iommu_fwspec_add_ids(dev, &id, 1);
 
     return ret;
 }
 
 static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
 {
     struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 
     return fwspec ? fwspec->ops : NULL;
 }
 
 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
                                const u32 *id_in)
 {
     int err;
     const struct iommu_ops *ops;
 
     /*
      * If we already translated the fwspec there is nothing left to do,
      * return the iommu_ops.
      */
     ops = acpi_iommu_fwspec_ops(dev);
     if (ops)
         return ops;
 
     err = iort_iommu_configure_id(dev, id_in);
     if (err && err != -EPROBE_DEFER)
         err = viot_iommu_configure(dev);
 
     /*
      * If we have reason to believe the IOMMU driver missed the initial
      * iommu_probe_device() call for dev, replay it to get things in order.
      */
     if (!err && dev->bus && !device_iommu_mapped(dev))
         err = iommu_probe_device(dev);
 
     /* Ignore all other errors apart from EPROBE_DEFER */
     if (err == -EPROBE_DEFER) {
         return ERR_PTR(err);
     } else if (err) {
         dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
         return NULL;
     }
     return acpi_iommu_fwspec_ops(dev);
 }
 
 #else /* !CONFIG_IOMMU_API */
 
 int acpi_iommu_fwspec_init(struct device *dev, u32 id,
                struct fwnode_handle *fwnode,
                const struct iommu_ops *ops)
 {
     return -ENODEV;
 }
 
 static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
                                const u32 *id_in)
 {
     return NULL;
 }
 
 #endif /* !CONFIG_IOMMU_API */
 
 /**
  * acpi_dma_configure_id - Set-up DMA configuration for the device.
  * @dev: The pointer to the device
  * @attr: device dma attributes
  * @input_id: input device id const value pointer
  */
 int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
               const u32 *input_id)
 {
     const struct iommu_ops *iommu;
     u64 dma_addr = 0, size = 0;
 
     if (attr == DEV_DMA_NOT_SUPPORTED) {
         set_dma_ops(dev, &dma_dummy_ops);
         return 0;
     }
 
     acpi_arch_dma_setup(dev, &dma_addr, &size);
 
     iommu = acpi_iommu_configure_id(dev, input_id);
     if (PTR_ERR(iommu) == -EPROBE_DEFER)
         return -EPROBE_DEFER;
 
     arch_setup_dma_ops(dev, dma_addr, size,
                 iommu, attr == DEV_DMA_COHERENT);
 
     return 0;
 }
 EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
 
 static void acpi_init_coherency(struct acpi_device *adev)
 {
     unsigned long long cca = 0;
     acpi_status status;
     struct acpi_device *parent = adev->parent;
 
     if (parent && parent->flags.cca_seen) {
         /*
          * From ACPI spec, OSPM will ignore _CCA if an ancestor
          * already saw one.
          */
         adev->flags.cca_seen = 1;
         cca = parent->flags.coherent_dma;
     } else {
         status = acpi_evaluate_integer(adev->handle, "_CCA",
                            NULL, &cca);
         if (ACPI_SUCCESS(status))
             adev->flags.cca_seen = 1;
         else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
             /*
              * If architecture does not specify that _CCA is
              * required for DMA-able devices (e.g. x86),
              * we default to _CCA=1.
              */
             cca = 1;
         else
             acpi_handle_debug(adev->handle,
                       "ACPI device is missing _CCA.\n");
     }
 
     adev->flags.coherent_dma = cca;
 }
 
 static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data)
 {
     bool *is_serial_bus_slave_p = data;
 
     if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
         return 1;
 
     *is_serial_bus_slave_p = true;
 
      /* no need to do more checking */
     return -1;
 }
 
 static bool acpi_is_indirect_io_slave(struct acpi_device *device)
 {
     struct acpi_device *parent = device->parent;
     static const struct acpi_device_id indirect_io_hosts[] = {
         {"HISI0191", 0},
         {}
     };
 
     return parent && !acpi_match_device_ids(parent, indirect_io_hosts);
 }
 
 static bool acpi_device_enumeration_by_parent(struct acpi_device *device)
 {
     struct list_head resource_list;
     bool is_serial_bus_slave = false;
     static const struct acpi_device_id ignore_serial_bus_ids[] = {
     /*
      * These devices have multiple SerialBus resources and a client
      * device must be instantiated for each of them, each with
      * its own device id.
      * Normally we only instantiate one client device for the first
      * resource, using the ACPI HID as id. These special cases are handled
      * by the drivers/platform/x86/serial-multi-instantiate.c driver, which
      * knows which client device id to use for each resource.
      */
         {"BSG1160", },
         {"BSG2150", },
         {"CSC3551", },
         {"INT33FE", },
         {"INT3515", },
         /* Non-conforming _HID for Cirrus Logic already released */
         {"CLSA0100", },
         {"CLSA0101", },
     /*
      * Some ACPI devs contain SerialBus resources even though they are not
      * attached to a serial bus at all.
      */
         {"MSHW0028", },
     /*
      * HIDs of device with an UartSerialBusV2 resource for which userspace
      * expects a regular tty cdev to be created (instead of the in kernel
      * serdev) and which have a kernel driver which expects a platform_dev
      * such as the rfkill-gpio driver.
      */
         {"BCM4752", },
         {"LNV4752", },
         {}
     };
 
     if (acpi_is_indirect_io_slave(device))
         return true;
 
     /* Macs use device properties in lieu of _CRS resources */
     if (x86_apple_machine &&
         (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||
          fwnode_property_present(&device->fwnode, "i2cAddress") ||
          fwnode_property_present(&device->fwnode, "baud")))
         return true;
 
     if (!acpi_match_device_ids(device, ignore_serial_bus_ids))
         return false;
 
     INIT_LIST_HEAD(&resource_list);
     acpi_dev_get_resources(device, &resource_list,
                    acpi_check_serial_bus_slave,
                    &is_serial_bus_slave);
     acpi_dev_free_resource_list(&resource_list);
 
     return is_serial_bus_slave;
 }
 
 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
                  int type)
 {
     INIT_LIST_HEAD(&device->pnp.ids);
     device->device_type = type;
     device->handle = handle;
     device->parent = acpi_bus_get_parent(handle);
     fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
     acpi_set_device_status(device, ACPI_STA_DEFAULT);
     acpi_device_get_busid(device);
     acpi_set_pnp_ids(handle, &device->pnp, type);
     acpi_init_properties(device);
     acpi_bus_get_flags(device);
     device->flags.match_driver = false;
     device->flags.initialized = true;
     device->flags.enumeration_by_parent =
         acpi_device_enumeration_by_parent(device);
     acpi_device_clear_enumerated(device);
     device_initialize(&device->dev);
     dev_set_uevent_suppress(&device->dev, true);
     acpi_init_coherency(device);
 }
 
 static void acpi_scan_dep_init(struct acpi_device *adev)
 {
     struct acpi_dep_data *dep;
 
     list_for_each_entry(dep, &acpi_dep_list, node) {
         if (dep->consumer == adev->handle) {
             if (dep->honor_dep)
                 adev->flags.honor_deps = 1;
 
             adev->dep_unmet++;
         }
     }
 }
 
 void acpi_device_add_finalize(struct acpi_device *device)
 {
     dev_set_uevent_suppress(&device->dev, false);
     kobject_uevent(&device->dev.kobj, KOBJ_ADD);
 }
 
 static void acpi_scan_init_status(struct acpi_device *adev)
 {
     if (acpi_bus_get_status(adev))
         acpi_set_device_status(adev, 0);
 }
 
 static int acpi_add_single_object(struct acpi_device **child,
                   acpi_handle handle, int type, bool dep_init)
 {
     struct acpi_device *device;
     bool release_dep_lock = false;
     int result;
 
     device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
     if (!device)
         return -ENOMEM;
 
     acpi_init_device_object(device, handle, type);
     /*
      * Getting the status is delayed till here so that we can call
      * acpi_bus_get_status() and use its quirk handling.  Note that
      * this must be done before the get power-/wakeup_dev-flags calls.
      */
     if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
         if (dep_init) {
             mutex_lock(&acpi_dep_list_lock);
             /*
              * Hold the lock until the acpi_tie_acpi_dev() call
              * below to prevent concurrent acpi_scan_clear_dep()
              * from deleting a dependency list entry without
              * updating dep_unmet for the device.
              */
             release_dep_lock = true;
             acpi_scan_dep_init(device);
         }
         acpi_scan_init_status(device);
     }
 
     acpi_bus_get_power_flags(device);
     acpi_bus_get_wakeup_device_flags(device);
 
     result = acpi_tie_acpi_dev(device);
 
     if (release_dep_lock)
         mutex_unlock(&acpi_dep_list_lock);
 
     if (!result)
         result = __acpi_device_add(device, acpi_device_release);
 
     if (result) {
         acpi_device_release(&device->dev);
         return result;
     }
 
     acpi_power_add_remove_device(device, true);
     acpi_device_add_finalize(device);
 
     acpi_handle_debug(handle, "Added as %s, parent %s\n",
               dev_name(&device->dev), device->parent ?
                 dev_name(&device->parent->dev) : "(null)");
 
     *child = device;
     return 0;
 }
 
 static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
                         void *context)
 {
     struct resource *res = context;
 
     if (acpi_dev_resource_memory(ares, res))
         return AE_CTRL_TERMINATE;
 
     return AE_OK;
 }
 
 static bool acpi_device_should_be_hidden(acpi_handle handle)
 {
     acpi_status status;
     struct resource res;
 
     /* Check if it should ignore the UART device */
     if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
         return false;
 
     /*
      * The UART device described in SPCR table is assumed to have only one
      * memory resource present. So we only look for the first one here.
      */
     status = acpi_walk_resources(handle, METHOD_NAME__CRS,
                      acpi_get_resource_memory, &res);
     if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
         return false;
 
     acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
              &res.start);
 
     return true;
 }
 
 bool acpi_device_is_present(const struct acpi_device *adev)
 {
     return adev->status.present || adev->status.functional;
 }
 
 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
                        const char *idstr,
                        const struct acpi_device_id **matchid)
 {
     const struct acpi_device_id *devid;
 
     if (handler->match)
         return handler->match(idstr, matchid);
 
     for (devid = handler->ids; devid->id[0]; devid++)
         if (!strcmp((char *)devid->id, idstr)) {
             if (matchid)
                 *matchid = devid;
 
             return true;
         }
 
     return false;
 }
 
 static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
                     const struct acpi_device_id **matchid)
 {
     struct acpi_scan_handler *handler;
 
     list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
         if (acpi_scan_handler_matching(handler, idstr, matchid))
             return handler;
 
     return NULL;
 }
 
 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
 {
     if (!!hotplug->enabled == !!val)
         return;
 
     mutex_lock(&acpi_scan_lock);
 
     hotplug->enabled = val;
 
     mutex_unlock(&acpi_scan_lock);
 }
 
 static void acpi_scan_init_hotplug(struct acpi_device *adev)
 {
     struct acpi_hardware_id *hwid;
 
     if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
         acpi_dock_add(adev);
         return;
     }
     list_for_each_entry(hwid, &adev->pnp.ids, list) {
         struct acpi_scan_handler *handler;
 
         handler = acpi_scan_match_handler(hwid->id, NULL);
         if (handler) {
             adev->flags.hotplug_notify = true;
             break;
         }
     }
 }
 
 static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep)
 {
     struct acpi_handle_list dep_devices;
     acpi_status status;
     u32 count;
     int i;
 
     /*
      * Check for _HID here to avoid deferring the enumeration of:
      * 1. PCI devices.
      * 2. ACPI nodes describing USB ports.
      * Still, checking for _HID catches more then just these cases ...
      */
     if (!check_dep || !acpi_has_method(handle, "_DEP") ||
         !acpi_has_method(handle, "_HID"))
         return 0;
 
     status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices);
     if (ACPI_FAILURE(status)) {
         acpi_handle_debug(handle, "Failed to evaluate _DEP.\n");
         return 0;
     }
 
     for (count = 0, i = 0; i < dep_devices.count; i++) {
         struct acpi_device_info *info;
         struct acpi_dep_data *dep;
         bool skip, honor_dep;
 
         status = acpi_get_object_info(dep_devices.handles[i], &info);
         if (ACPI_FAILURE(status)) {
             acpi_handle_debug(handle, "Error reading _DEP device info\n");
             continue;
         }
 
         skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids);
         honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids);
         kfree(info);
 
         if (skip)
             continue;
 
         dep = kzalloc(sizeof(*dep), GFP_KERNEL);
         if (!dep)
             continue;
 
         count++;
 
         dep->supplier = dep_devices.handles[i];
         dep->consumer = handle;
         dep->honor_dep = honor_dep;
 
         mutex_lock(&acpi_dep_list_lock);
         list_add_tail(&dep->node , &acpi_dep_list);
         mutex_unlock(&acpi_dep_list_lock);
     }
 
     return count;
 }
 
 static bool acpi_bus_scan_second_pass;
 
 static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
                       struct acpi_device **adev_p)
 {
     struct acpi_device *device = acpi_fetch_acpi_dev(handle);
     acpi_object_type acpi_type;
     int type;
 
     if (device)
         goto out;
 
     if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type)))
         return AE_OK;
 
     switch (acpi_type) {
     case ACPI_TYPE_DEVICE:
         if (acpi_device_should_be_hidden(handle))
             return AE_OK;
 
         /* Bail out if there are dependencies. */
         if (acpi_scan_check_dep(handle, check_dep) > 0) {
             acpi_bus_scan_second_pass = true;
             return AE_CTRL_DEPTH;
         }
 
         fallthrough;
     case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
         type = ACPI_BUS_TYPE_DEVICE;
         break;
 
     case ACPI_TYPE_PROCESSOR:
         type = ACPI_BUS_TYPE_PROCESSOR;
         break;
 
     case ACPI_TYPE_THERMAL:
         type = ACPI_BUS_TYPE_THERMAL;
         break;
 
     case ACPI_TYPE_POWER:
         acpi_add_power_resource(handle);
         fallthrough;
     default:
         return AE_OK;
     }
 
     /*
      * If check_dep is true at this point, the device has no dependencies,
      * or the creation of the device object would have been postponed above.
      */
     acpi_add_single_object(&device, handle, type, !check_dep);
     if (!device)
         return AE_CTRL_DEPTH;
 
     acpi_scan_init_hotplug(device);
 
 out:
     if (!*adev_p)
         *adev_p = device;
 
     return AE_OK;
 }
 
 static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used,
                     void *not_used, void **ret_p)
 {
     return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p);
 }
 
 static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used,
                     void *not_used, void **ret_p)
 {
     return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p);
 }
 
 static void acpi_default_enumeration(struct acpi_device *device)
 {
     /*
      * Do not enumerate devices with enumeration_by_parent flag set as
      * they will be enumerated by their respective parents.
      */
     if (!device->flags.enumeration_by_parent) {
         acpi_create_platform_device(device, NULL);
         acpi_device_set_enumerated(device);
     } else {
         blocking_notifier_call_chain(&acpi_reconfig_chain,
                          ACPI_RECONFIG_DEVICE_ADD, device);
     }
 }
 
 static const struct acpi_device_id generic_device_ids[] = {
     {ACPI_DT_NAMESPACE_HID, },
     {"", },
 };
 
 static int acpi_generic_device_attach(struct acpi_device *adev,
                       const struct acpi_device_id *not_used)
 {
     /*
      * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
      * below can be unconditional.
      */
     if (adev->data.of_compatible)
         acpi_default_enumeration(adev);
 
     return 1;
 }
 
 static struct acpi_scan_handler generic_device_handler = {
     .ids = generic_device_ids,
     .attach = acpi_generic_device_attach,
 };
 
 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) {
         const struct acpi_device_id *devid;
         struct acpi_scan_handler *handler;
 
         handler = acpi_scan_match_handler(hwid->id, &devid);
         if (handler) {
             if (!handler->attach) {
                 device->pnp.type.platform_id = 0;
                 continue;
             }
             device->handler = handler;
             ret = handler->attach(device, devid);
             if (ret > 0)
                 break;
 
             device->handler = NULL;
             if (ret < 0)
                 break;
         }
     }
 
     return ret;
 }
 
 static int acpi_bus_attach(struct acpi_device *device, void *first_pass)
 {
     bool skip = !first_pass && device->flags.visited;
     acpi_handle ejd;
     int ret;
 
     if (skip)
         goto ok;
 
     if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
         register_dock_dependent_device(device, ejd);
 
     acpi_bus_get_status(device);
     /* Skip devices that are not ready for enumeration (e.g. not present) */
     if (!acpi_dev_ready_for_enumeration(device)) {
         device->flags.initialized = false;
         acpi_device_clear_enumerated(device);
         device->flags.power_manageable = 0;
         return 0;
     }
     if (device->handler)
         goto ok;
 
     if (!device->flags.initialized) {
         device->flags.power_manageable =
             device->power.states[ACPI_STATE_D0].flags.valid;
         if (acpi_bus_init_power(device))
             device->flags.power_manageable = 0;
 
         device->flags.initialized = true;
     } else if (device->flags.visited) {
         goto ok;
     }
 
     ret = acpi_scan_attach_handler(device);
     if (ret < 0)
         return 0;
 
     device->flags.match_driver = true;
     if (ret > 0 && !device->flags.enumeration_by_parent) {
         acpi_device_set_enumerated(device);
         goto ok;
     }
 
     ret = device_attach(&device->dev);
     if (ret < 0)
         return 0;
 
     if (device->pnp.type.platform_id || device->flags.enumeration_by_parent)
         acpi_default_enumeration(device);
     else
         acpi_device_set_enumerated(device);
 
 ok:
     acpi_dev_for_each_child(device, acpi_bus_attach, first_pass);
 
     if (!skip && device->handler && device->handler->hotplug.notify_online)
         device->handler->hotplug.notify_online(device);
 
     return 0;
 }
 
 static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
 {
     struct acpi_device *adev;
 
     adev = acpi_bus_get_acpi_device(dep->consumer);
     if (adev) {
         *(struct acpi_device **)data = adev;
         return 1;
     }
     /* Continue parsing if the device object is not present. */
     return 0;
 }
 
 struct acpi_scan_clear_dep_work {
     struct work_struct work;
     struct acpi_device *adev;
 };
 
 static void acpi_scan_clear_dep_fn(struct work_struct *work)
 {
     struct acpi_scan_clear_dep_work *cdw;
 
     cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
 
     acpi_scan_lock_acquire();
     acpi_bus_attach(cdw->adev, (void *)true);
     acpi_scan_lock_release();
 
     acpi_dev_put(cdw->adev);
     kfree(cdw);
 }
 
 static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
 {
     struct acpi_scan_clear_dep_work *cdw;
 
     if (adev->dep_unmet)
         return false;
 
     cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
     if (!cdw)
         return false;
 
     cdw->adev = adev;
     INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
     /*
      * Since the work function may block on the lock until the entire
      * initial enumeration of devices is complete, put it into the unbound
      * workqueue.
      */
     queue_work(system_unbound_wq, &cdw->work);
 
     return true;
 }
 
 static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
 {
     struct acpi_device *adev = acpi_bus_get_acpi_device(dep->consumer);
 
     if (adev) {
         adev->dep_unmet--;
         if (!acpi_scan_clear_dep_queue(adev))
             acpi_dev_put(adev);
     }
 
     list_del(&dep->node);
     kfree(dep);
 
     return 0;
 }
 
 /**
  * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
  * @handle: The ACPI handle of the supplier device
  * @callback:   Pointer to the callback function to apply
  * @data:   Pointer to some data to pass to the callback
  *
  * The return value of the callback determines this function's behaviour. If 0
  * is returned we continue to iterate over acpi_dep_list. If a positive value
  * is returned then the loop is broken but this function returns 0. If a
  * negative value is returned by the callback then the loop is broken and that
  * value is returned as the final error.
  */
 static int acpi_walk_dep_device_list(acpi_handle handle,
                 int (*callback)(struct acpi_dep_data *, void *),
                 void *data)
 {
     struct acpi_dep_data *dep, *tmp;
     int ret = 0;
 
     mutex_lock(&acpi_dep_list_lock);
     list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
         if (dep->supplier == handle) {
             ret = callback(dep, data);
             if (ret)
                 break;
         }
     }
     mutex_unlock(&acpi_dep_list_lock);
 
     return ret > 0 ? 0 : ret;
 }
 
 /**
  * acpi_dev_clear_dependencies - Inform consumers that the device is now active
  * @supplier: Pointer to the supplier &struct acpi_device
  *
  * Clear dependencies on the given device.
  */
 void acpi_dev_clear_dependencies(struct acpi_device *supplier)
 {
     acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
 
 /**
  * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration
  * @device: Pointer to the &struct acpi_device to check
  *
  * Check if the device is present and has no unmet dependencies.
  *
  * Return true if the device is ready for enumeratino. Otherwise, return false.
  */
 bool acpi_dev_ready_for_enumeration(const struct acpi_device *device)
 {
     if (device->flags.honor_deps && device->dep_unmet)
         return false;
 
     return acpi_device_is_present(device);
 }
 EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
 
 /**
  * acpi_dev_get_first_consumer_dev - Return ACPI device dependent on @supplier
  * @supplier: Pointer to the dependee device
  *
  * Returns the first &struct acpi_device which declares itself dependent on
  * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
  *
  * The caller is responsible for putting the reference to adev when it is no
  * longer needed.
  */
 struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier)
 {
     struct acpi_device *adev = NULL;
 
     acpi_walk_dep_device_list(supplier->handle,
                   acpi_dev_get_first_consumer_dev_cb, &adev);
 
     return adev;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev);
 
 /**
  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
  * @handle: Root of the namespace scope to scan.
  *
  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
  * found devices.
  *
  * 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.
  *
  * Must be called under acpi_scan_lock.
  */
 int acpi_bus_scan(acpi_handle handle)
 {
     struct acpi_device *device = NULL;
 
     acpi_bus_scan_second_pass = false;
 
     /* Pass 1: Avoid enumerating devices with missing dependencies. */
 
     if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device)))
         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
                     acpi_bus_check_add_1, NULL, NULL,
                     (void **)&device);
 
     if (!device)
         return -ENODEV;
 
     acpi_bus_attach(device, (void *)true);
 
     if (!acpi_bus_scan_second_pass)
         return 0;
 
     /* Pass 2: Enumerate all of the remaining devices. */
 
     device = NULL;
 
     if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device)))
         acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
                     acpi_bus_check_add_2, NULL, NULL,
                     (void **)&device);
 
     acpi_bus_attach(device, NULL);
 
     return 0;
 }
 EXPORT_SYMBOL(acpi_bus_scan);
 
 static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
 {
     struct acpi_scan_handler *handler = adev->handler;
 
     acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
 
     adev->flags.match_driver = false;
     if (handler) {
         if (handler->detach)
             handler->detach(adev);
 
         adev->handler = NULL;
     } else {
         device_release_driver(&adev->dev);
     }
     /*
      * Most likely, the device is going away, so put it into D3cold before
      * that.
      */
     acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
     adev->flags.initialized = false;
     acpi_device_clear_enumerated(adev);
 
     return 0;
 }
 
 /**
  * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
  * @adev: Root of the ACPI namespace scope to walk.
  *
  * Must be called under acpi_scan_lock.
  */
 void acpi_bus_trim(struct acpi_device *adev)
 {
     acpi_bus_trim_one(adev, NULL);
 }
 EXPORT_SYMBOL_GPL(acpi_bus_trim);
 
 int acpi_bus_register_early_device(int type)
 {
     struct acpi_device *device = NULL;
     int result;
 
     result = acpi_add_single_object(&device, NULL, type, false);
     if (result)
         return result;
 
     device->flags.match_driver = true;
     return device_attach(&device->dev);
 }
 EXPORT_SYMBOL_GPL(acpi_bus_register_early_device);
 
 static void acpi_bus_scan_fixed(void)
 {
     if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
         struct acpi_device *adev = NULL;
 
         acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON,
                        false);
         if (adev) {
             adev->flags.match_driver = true;
             if (device_attach(&adev->dev) >= 0)
                 device_init_wakeup(&adev->dev, true);
             else
                 dev_dbg(&adev->dev, "No driver\n");
         }
     }
 
     if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
         struct acpi_device *adev = NULL;
 
         acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON,
                        false);
         if (adev) {
             adev->flags.match_driver = true;
             if (device_attach(&adev->dev) < 0)
                 dev_dbg(&adev->dev, "No driver\n");
         }
     }
 }
 
 static void __init acpi_get_spcr_uart_addr(void)
 {
     acpi_status status;
     struct acpi_table_spcr *spcr_ptr;
 
     status = acpi_get_table(ACPI_SIG_SPCR, 0,
                 (struct acpi_table_header **)&spcr_ptr);
     if (ACPI_FAILURE(status)) {
         pr_warn("STAO table present, but SPCR is missing\n");
         return;
     }
 
     spcr_uart_addr = spcr_ptr->serial_port.address;
     acpi_put_table((struct acpi_table_header *)spcr_ptr);
 }
 
 static bool acpi_scan_initialized;
 
 void __init acpi_scan_init(void)
 {
     acpi_status status;
     struct acpi_table_stao *stao_ptr;
 
     acpi_pci_root_init();
     acpi_pci_link_init();
     acpi_processor_init();
     acpi_platform_init();
     acpi_lpss_init();
     acpi_apd_init();
     acpi_cmos_rtc_init();
     acpi_container_init();
     acpi_memory_hotplug_init();
     acpi_watchdog_init();
     acpi_pnp_init();
     acpi_int340x_thermal_init();
     acpi_amba_init();
     acpi_init_lpit();
 
     acpi_scan_add_handler(&generic_device_handler);
 
     /*
      * If there is STAO table, check whether it needs to ignore the UART
      * device in SPCR table.
      */
     status = acpi_get_table(ACPI_SIG_STAO, 0,
                 (struct acpi_table_header **)&stao_ptr);
     if (ACPI_SUCCESS(status)) {
         if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
             pr_info("STAO Name List not yet supported.\n");
 
         if (stao_ptr->ignore_uart)
             acpi_get_spcr_uart_addr();
 
         acpi_put_table((struct acpi_table_header *)stao_ptr);
     }
 
     acpi_gpe_apply_masked_gpes();
     acpi_update_all_gpes();
 
     /*
      * Although we call __add_memory() that is documented to require the
      * device_hotplug_lock, it is not necessary here because this is an
      * early code when userspace or any other code path cannot trigger
      * hotplug/hotunplug operations.
      */
     mutex_lock(&acpi_scan_lock);
     /*
      * Enumerate devices in the ACPI namespace.
      */
     if (acpi_bus_scan(ACPI_ROOT_OBJECT))
         goto unlock;
 
     acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT);
     if (!acpi_root)
         goto unlock;
 
     /* Fixed feature devices do not exist on HW-reduced platform */
     if (!acpi_gbl_reduced_hardware)
         acpi_bus_scan_fixed();
 
     acpi_turn_off_unused_power_resources();
 
     acpi_scan_initialized = true;
 
 unlock:
     mutex_unlock(&acpi_scan_lock);
 }
 
 static struct acpi_probe_entry *ape;
 static int acpi_probe_count;
 static DEFINE_MUTEX(acpi_probe_mutex);
 
 static int __init acpi_match_madt(union acpi_subtable_headers *header,
                   const unsigned long end)
 {
     if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape))
         if (!ape->probe_subtbl(header, end))
             acpi_probe_count++;
 
     return 0;
 }
 
 int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
 {
     int count = 0;
 
     if (acpi_disabled)
         return 0;
 
     mutex_lock(&acpi_probe_mutex);
     for (ape = ap_head; nr; ape++, nr--) {
         if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) {
             acpi_probe_count = 0;
             acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
             count += acpi_probe_count;
         } else {
             int res;
             res = acpi_table_parse(ape->id, ape->probe_table);
             if (!res)
                 count++;
         }
     }
     mutex_unlock(&acpi_probe_mutex);
 
     return count;
 }
 
 static void acpi_table_events_fn(struct work_struct *work)
 {
     acpi_scan_lock_acquire();
     acpi_bus_scan(ACPI_ROOT_OBJECT);
     acpi_scan_lock_release();
 
     kfree(work);
 }
 
 void acpi_scan_table_notify(void)
 {
     struct work_struct *work;
 
     if (!acpi_scan_initialized)
         return;
 
     work = kmalloc(sizeof(*work), GFP_KERNEL);
     if (!work)
         return;
 
     INIT_WORK(work, acpi_table_events_fn);
     schedule_work(work);
 }
 
 int acpi_reconfig_notifier_register(struct notifier_block *nb)
 {
     return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
 }
 EXPORT_SYMBOL(acpi_reconfig_notifier_register);
 
 int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
 {
     return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
 }
 EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);

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