diff options
Diffstat (limited to 'drivers/acpi/scan.c')
| -rw-r--r-- | drivers/acpi/scan.c | 621 |
1 files changed, 386 insertions, 235 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index fd39459..7384158 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -12,13 +12,12 @@ #include <linux/dmi.h> #include <linux/nls.h> -#include <acpi/acpi_drivers.h> +#include <asm/pgtable.h> #include "internal.h" #define _COMPONENT ACPI_BUS_COMPONENT ACPI_MODULE_NAME("scan"); -#define STRUCT_TO_INT(s) (*((int*)&s)) extern struct acpi_device *acpi_root; #define ACPI_BUS_CLASS "system_bus" @@ -27,6 +26,8 @@ extern struct acpi_device *acpi_root; #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) +#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) + /* * If set, devices will be hot-removed even if they cannot be put offline * gracefully (from the kernel's standpoint). @@ -85,6 +86,9 @@ int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, * Creates hid/cid(s) string needed for modalias and uevent * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: * char *modalias: "acpi:IBM0001:ACPI0001" + * Return: 0: no _HID and no _CID + * -EINVAL: output error + * -ENOMEM: output is truncated */ static int create_modalias(struct acpi_device *acpi_dev, char *modalias, int size) @@ -101,8 +105,10 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias, list_for_each_entry(id, &acpi_dev->pnp.ids, list) { count = snprintf(&modalias[len], size, "%s:", id->id); - if (count < 0 || count >= size) - return -EINVAL; + if (count < 0) + return EINVAL; + if (count >= size) + return -ENOMEM; len += count; size -= count; } @@ -111,20 +117,96 @@ static int create_modalias(struct acpi_device *acpi_dev, char *modalias, return len; } +/* + * Creates uevent modalias field for ACPI enumerated devices. + * Because the other buses does not support ACPI HIDs & CIDs. + * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: + * "acpi:IBM0001:ACPI0001" + */ +int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) +{ + struct acpi_device *acpi_dev; + int len; + + acpi_dev = ACPI_COMPANION(dev); + if (!acpi_dev) + return -ENODEV; + + /* Fall back to bus specific way of modalias exporting */ + if (list_empty(&acpi_dev->pnp.ids)) + return -ENODEV; + + if (add_uevent_var(env, "MODALIAS=")) + return -ENOMEM; + len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], + sizeof(env->buf) - env->buflen); + if (len <= 0) + return len; + env->buflen += len; + return 0; +} +EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); + +/* + * Creates modalias sysfs attribute for ACPI enumerated devices. + * Because the other buses does not support ACPI HIDs & CIDs. + * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: + * "acpi:IBM0001:ACPI0001" + */ +int acpi_device_modalias(struct device *dev, char *buf, int size) +{ + struct acpi_device *acpi_dev; + int len; + + acpi_dev = ACPI_COMPANION(dev); + if (!acpi_dev) + return -ENODEV; + + /* Fall back to bus specific way of modalias exporting */ + if (list_empty(&acpi_dev->pnp.ids)) + return -ENODEV; + + len = create_modalias(acpi_dev, buf, size -1); + if (len <= 0) + return len; + buf[len++] = '\n'; + return len; +} +EXPORT_SYMBOL_GPL(acpi_device_modalias); + static ssize_t acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *acpi_dev = to_acpi_device(dev); int len; - /* Device has no HID and no CID or string is >1024 */ len = create_modalias(acpi_dev, buf, 1024); if (len <= 0) - return 0; + return len; buf[len++] = '\n'; return len; } static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); +bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) +{ + struct acpi_device_physical_node *pn; + bool offline = true; + + mutex_lock(&adev->physical_node_lock); + + list_for_each_entry(pn, &adev->physical_node_list, node) + if (device_supports_offline(pn->dev) && !pn->dev->offline) { + if (uevent) + kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); + + 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) { @@ -195,19 +277,11 @@ static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, return AE_OK; } -static int acpi_scan_hot_remove(struct acpi_device *device) +static int acpi_scan_try_to_offline(struct acpi_device *device) { acpi_handle handle = device->handle; - struct device *errdev; + struct device *errdev = NULL; acpi_status status; - unsigned long long sta; - - /* If there is no handle, the device node has been unregistered. */ - if (!handle) { - dev_dbg(&device->dev, "ACPI handle missing\n"); - put_device(&device->dev); - return -EINVAL; - } /* * Carry out two passes here and ignore errors in the first pass, @@ -218,7 +292,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device) * * If the first pass is successful, the second one isn't needed, though. */ - errdev = NULL; status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, NULL, acpi_bus_offline, (void *)false, (void **)&errdev); @@ -226,7 +299,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device) dev_warn(errdev, "Offline disabled.\n"); acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_online, NULL, NULL, NULL); - put_device(&device->dev); return -EPERM; } acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); @@ -245,20 +317,32 @@ static int acpi_scan_hot_remove(struct acpi_device *device) acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_online, NULL, NULL, NULL); - put_device(&device->dev); 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->hotplug.demand_offline && !acpi_force_hot_remove) { + if (!acpi_scan_is_offline(device, true)) + return -EBUSY; + } else { + int error = acpi_scan_try_to_offline(device); + if (error) + return error; + } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Hot-removing device %s...\n", dev_name(&device->dev))); acpi_bus_trim(device); - /* Device node has been unregistered. */ - put_device(&device->dev); - device = NULL; - acpi_evaluate_lck(handle, 0); /* * TBD: _EJD support. @@ -285,115 +369,127 @@ static int acpi_scan_hot_remove(struct acpi_device *device) return 0; } -void acpi_bus_device_eject(void *data, u32 ost_src) +static int acpi_scan_device_not_present(struct acpi_device *adev) { - struct acpi_device *device = data; - acpi_handle handle = device->handle; - u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; - int error; + if (!acpi_device_enumerated(adev)) { + dev_warn(&adev->dev, "Still not present\n"); + return -EALREADY; + } + acpi_bus_trim(adev); + return 0; +} - lock_device_hotplug(); - mutex_lock(&acpi_scan_lock); +static int acpi_scan_device_check(struct acpi_device *adev) +{ + int error; - if (ost_src == ACPI_NOTIFY_EJECT_REQUEST) - acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, - ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); + 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; +} - if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) - kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); +static int acpi_scan_bus_check(struct acpi_device *adev) +{ + struct acpi_scan_handler *handler = adev->handler; + struct acpi_device *child; + int error; - error = acpi_scan_hot_remove(device); - if (error == -EPERM) { - goto err_support; - } else if (error) { - goto err_out; + 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); - out: - mutex_unlock(&acpi_scan_lock); - unlock_device_hotplug(); - return; - - err_support: - ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; - err_out: - acpi_evaluate_hotplug_ost(handle, ost_src, ost_code, NULL); - goto out; + error = acpi_bus_scan(adev->handle); + if (error) { + dev_warn(&adev->dev, "Namespace scan failure\n"); + return error; + } + list_for_each_entry(child, &adev->children, node) { + error = acpi_scan_bus_check(child); + if (error) + return error; + } + return 0; } -static void acpi_scan_bus_device_check(void *data, u32 ost_source) +static void acpi_device_hotplug(void *data, u32 src) { - acpi_handle handle = data; - struct acpi_device *device = NULL; u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; + struct acpi_device *adev = data; int error; lock_device_hotplug(); mutex_lock(&acpi_scan_lock); - if (ost_source != ACPI_NOTIFY_BUS_CHECK) { - acpi_bus_get_device(handle, &device); - if (device) { - dev_warn(&device->dev, "Attempt to re-insert\n"); - goto out; - } - } - error = acpi_bus_scan(handle); - if (error) { - acpi_handle_warn(handle, "Namespace scan failure\n"); - goto out; - } - error = acpi_bus_get_device(handle, &device); - if (error) { - acpi_handle_warn(handle, "Missing device node object\n"); + /* + * The device object's ACPI handle cannot become invalid as long as we + * are holding acpi_scan_lock, but it may have become invalid before + * that lock was acquired. + */ + if (adev->handle == INVALID_ACPI_HANDLE) goto out; - } - ost_code = ACPI_OST_SC_SUCCESS; - if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) - kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); - out: - acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL); - mutex_unlock(&acpi_scan_lock); - unlock_device_hotplug(); -} - -static void acpi_hotplug_unsupported(acpi_handle handle, u32 type) -{ - u32 ost_status; - - switch (type) { + switch (src) { case ACPI_NOTIFY_BUS_CHECK: - acpi_handle_debug(handle, - "ACPI_NOTIFY_BUS_CHECK event: unsupported\n"); - ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; + error = acpi_scan_bus_check(adev); break; case ACPI_NOTIFY_DEVICE_CHECK: - acpi_handle_debug(handle, - "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n"); - ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; + error = acpi_scan_device_check(adev); break; case ACPI_NOTIFY_EJECT_REQUEST: - acpi_handle_debug(handle, - "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n"); - ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED; + case ACPI_OST_EC_OSPM_EJECT: + error = acpi_scan_hot_remove(adev); break; default: - /* non-hotplug event; possibly handled by other handler */ - return; + error = -EINVAL; + break; } + if (!error) + ost_code = ACPI_OST_SC_SUCCESS; - acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL); + out: + acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL); + put_device(&adev->dev); + mutex_unlock(&acpi_scan_lock); + unlock_device_hotplug(); } static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) { + u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; struct acpi_scan_handler *handler = data; struct acpi_device *adev; acpi_status status; - if (!handler->hotplug.enabled) - return acpi_hotplug_unsupported(handle, type); + if (acpi_bus_get_device(handle, &adev)) + goto err_out; switch (type) { case ACPI_NOTIFY_BUS_CHECK: @@ -404,27 +500,27 @@ static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) break; case ACPI_NOTIFY_EJECT_REQUEST: acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); - if (acpi_bus_get_device(handle, &adev)) + if (!handler->hotplug.enabled) { + acpi_handle_err(handle, "Eject disabled\n"); + ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; goto err_out; - - get_device(&adev->dev); - status = acpi_hotplug_execute(acpi_bus_device_eject, adev, type); - if (ACPI_SUCCESS(status)) - return; - - put_device(&adev->dev); - goto err_out; + } + acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, + ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); + break; default: /* non-hotplug event; possibly handled by other handler */ return; } - status = acpi_hotplug_execute(acpi_scan_bus_device_check, handle, type); + get_device(&adev->dev); + status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); if (ACPI_SUCCESS(status)) return; + put_device(&adev->dev); + err_out: - acpi_evaluate_hotplug_ost(handle, type, - ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); + acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); } static ssize_t real_power_state_show(struct device *dev, @@ -475,7 +571,7 @@ acpi_eject_store(struct device *d, struct device_attribute *attr, acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); get_device(&acpi_device->dev); - status = acpi_hotplug_execute(acpi_bus_device_eject, acpi_device, + status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device, ACPI_OST_EC_OSPM_EJECT); if (ACPI_SUCCESS(status)) return count; @@ -567,6 +663,20 @@ acpi_device_sun_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); +static ssize_t status_show(struct device *dev, struct device_attribute *attr, + char *buf) { + struct acpi_device *acpi_dev = to_acpi_device(dev); + acpi_status status; + unsigned long long sta; + + status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); + if (ACPI_FAILURE(status)) + return -ENODEV; + + return sprintf(buf, "%llu\n", sta); +} +static DEVICE_ATTR_RO(status); + static int acpi_device_setup_files(struct acpi_device *dev) { struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; @@ -622,6 +732,12 @@ static int acpi_device_setup_files(struct acpi_device *dev) dev->pnp.sun = (unsigned long)-1; } + if (acpi_has_method(dev->handle, "_STA")) { + result = device_create_file(&dev->dev, &dev_attr_status); + if (result) + goto end; + } + /* * If device has _EJ0, 'eject' file is created that is used to trigger * hot-removal function from userland. @@ -677,6 +793,8 @@ static void acpi_device_remove_files(struct acpi_device *dev) device_remove_file(&dev->dev, &dev_attr_adr); device_remove_file(&dev->dev, &dev_attr_modalias); device_remove_file(&dev->dev, &dev_attr_hid); + if (acpi_has_method(dev->handle, "_STA")) + device_remove_file(&dev->dev, &dev_attr_status); if (dev->handle) device_remove_file(&dev->dev, &dev_attr_path); } @@ -782,8 +900,8 @@ static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) return -ENOMEM; len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], sizeof(env->buf) - env->buflen); - if (len >= (sizeof(env->buf) - env->buflen)) - return -ENOMEM; + if (len <= 0) + return len; env->buflen += len; return 0; } @@ -907,9 +1025,91 @@ struct bus_type acpi_bus_type = { .uevent = acpi_device_uevent, }; -static void acpi_bus_data_handler(acpi_handle handle, void *context) +static void acpi_device_del(struct acpi_device *device) +{ + mutex_lock(&acpi_device_lock); + if (device->parent) + list_del(&device->node); + + 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 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); + + 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); + put_device(&adev->dev); + } +} + +/** + * 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) { - /* Intentionally empty. */ + 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 previosuly, 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); } int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) @@ -919,7 +1119,7 @@ int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) if (!device) return -EINVAL; - status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); + status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device); if (ACPI_FAILURE(status) || !*device) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", handle)); @@ -939,7 +1139,7 @@ int acpi_device_add(struct acpi_device *device, if (device->handle) { acpi_status status; - status = acpi_attach_data(device->handle, acpi_bus_data_handler, + status = acpi_attach_data(device->handle, acpi_scan_drop_device, device); if (ACPI_FAILURE(status)) { acpi_handle_err(device->handle, @@ -957,6 +1157,7 @@ int acpi_device_add(struct acpi_device *device, INIT_LIST_HEAD(&device->node); 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); new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); @@ -1020,37 +1221,10 @@ int acpi_device_add(struct acpi_device *device, mutex_unlock(&acpi_device_lock); err_detach: - acpi_detach_data(device->handle, acpi_bus_data_handler); + acpi_detach_data(device->handle, acpi_scan_drop_device); return result; } -static void acpi_device_unregister(struct acpi_device *device) -{ - mutex_lock(&acpi_device_lock); - if (device->parent) - list_del(&device->node); - - list_del(&device->wakeup_list); - mutex_unlock(&acpi_device_lock); - - acpi_detach_data(device->handle, acpi_bus_data_handler); - - acpi_power_add_remove_device(device, false); - acpi_device_remove_files(device); - if (device->remove) - device->remove(device); - - device_del(&device->dev); - /* - * Transition the device to D3cold to drop the reference counts of all - * power resources the device depends on and turn off the ones that have - * no more references. - */ - acpi_device_set_power(device, ACPI_STATE_D3_COLD); - device->handle = NULL; - put_device(&device->dev); -} - /* -------------------------------------------------------------------------- Driver Management -------------------------------------------------------------------------- */ @@ -1624,11 +1798,13 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, device->device_type = type; device->handle = handle; device->parent = acpi_bus_get_parent(handle); - STRUCT_TO_INT(device->status) = sta; + acpi_set_device_status(device, sta); acpi_device_get_busid(device); acpi_set_pnp_ids(handle, &device->pnp, type); acpi_bus_get_flags(device); device->flags.match_driver = false; + device->flags.initialized = true; + device->flags.visited = false; device_initialize(&device->dev); dev_set_uevent_suppress(&device->dev, true); } @@ -1713,6 +1889,15 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type, return 0; } +bool acpi_device_is_present(struct acpi_device *adev) +{ + if (adev->status.present || adev->status.functional) + return true; + + adev->flags.initialized = false; + return false; +} + static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, char *idstr, const struct acpi_device_id **matchid) @@ -1772,7 +1957,7 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type) */ list_for_each_entry(hwid, &pnp.ids, list) { handler = acpi_scan_match_handler(hwid->id, NULL); - if (handler && !handler->hotplug.ignore) { + if (handler) { acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, acpi_hotplug_notify_cb, handler); break; @@ -1806,18 +1991,6 @@ static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, acpi_scan_init_hotplug(handle, type); - if (!(sta & ACPI_STA_DEVICE_PRESENT) && - !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { - struct acpi_device_wakeup wakeup; - - if (acpi_has_method(handle, "_PRW")) { - acpi_bus_extract_wakeup_device_power_package(handle, - &wakeup); - acpi_power_resources_list_free(&wakeup.resources); - } - return AE_CTRL_DEPTH; - } - acpi_add_single_object(&device, handle, type, sta); if (!device) return AE_CTRL_DEPTH; @@ -1852,36 +2025,40 @@ static int acpi_scan_attach_handler(struct acpi_device *device) return ret; } -static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **ret_not_used) +static void acpi_bus_attach(struct acpi_device *device) { - struct acpi_device *device; - unsigned long long sta_not_used; + struct acpi_device *child; int ret; - /* - * Ignore errors ignored by acpi_bus_check_add() to avoid terminating - * namespace walks prematurely. - */ - if (acpi_bus_type_and_status(handle, &ret, &sta_not_used)) - return AE_OK; - - if (acpi_bus_get_device(handle, &device)) - return AE_CTRL_DEPTH; - + acpi_bus_get_status(device); + /* Skip devices that are not present. */ + if (!acpi_device_is_present(device)) { + device->flags.visited = false; + return; + } if (device->handler) - return AE_OK; + goto ok; + if (!device->flags.initialized) { + acpi_bus_update_power(device, NULL); + device->flags.initialized = true; + } + device->flags.visited = false; ret = acpi_scan_attach_handler(device); if (ret < 0) - return AE_CTRL_DEPTH; + return; device->flags.match_driver = true; - if (ret > 0) - return AE_OK; + if (!ret) { + ret = device_attach(&device->dev); + if (ret < 0) + return; + } + device->flags.visited = true; - ret = device_attach(&device->dev); - return ret >= 0 ? AE_OK : AE_CTRL_DEPTH; + ok: + list_for_each_entry(child, &device->children, node) + acpi_bus_attach(child); } /** @@ -1901,75 +2078,49 @@ static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, int acpi_bus_scan(acpi_handle handle) { void *device = NULL; - int error = 0; if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, acpi_bus_check_add, NULL, NULL, &device); - if (!device) - error = -ENODEV; - else 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 error; -} -EXPORT_SYMBOL(acpi_bus_scan); - -static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **ret_not_used) -{ - struct acpi_device *device = NULL; - - if (!acpi_bus_get_device(handle, &device)) { - struct acpi_scan_handler *dev_handler = device->handler; - - if (dev_handler) { - if (dev_handler->detach) - dev_handler->detach(device); - - device->handler = NULL; - } else { - device_release_driver(&device->dev); - } + if (device) { + acpi_bus_attach(device); + return 0; } - return AE_OK; -} - -static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used, - void *not_used, void **ret_not_used) -{ - struct acpi_device *device = NULL; - - if (!acpi_bus_get_device(handle, &device)) - acpi_device_unregister(device); - - return AE_OK; + return -ENODEV; } +EXPORT_SYMBOL(acpi_bus_scan); /** - * acpi_bus_trim - Remove ACPI device node and all of its descendants - * @start: Root of the ACPI device nodes subtree to remove. + * 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 *start) +void acpi_bus_trim(struct acpi_device *adev) { + struct acpi_scan_handler *handler = adev->handler; + struct acpi_device *child; + + list_for_each_entry_reverse(child, &adev->children, node) + acpi_bus_trim(child); + + adev->flags.match_driver = false; + if (handler) { + if (handler->detach) + handler->detach(adev); + + adev->handler = NULL; + } else { + device_release_driver(&adev->dev); + } /* - * 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. + * Most likely, the device is going away, so put it into D3cold before + * that. */ - 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); + acpi_device_set_power(adev, ACPI_STATE_D3_COLD); + adev->flags.initialized = false; + adev->flags.visited = false; } EXPORT_SYMBOL_GPL(acpi_bus_trim); @@ -2047,14 +2198,14 @@ int __init acpi_scan_init(void) result = acpi_bus_scan_fixed(); if (result) { - acpi_device_unregister(acpi_root); + acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); + acpi_device_del(acpi_root); + put_device(&acpi_root->dev); goto out; } acpi_update_all_gpes(); - acpi_pci_root_hp_init(); - out: mutex_unlock(&acpi_scan_lock); return result; |
