ACPICA: Add support for multiple notify handlers

This change adds support to allow multiple notify handlers on
Device, ThermalZone, and Processor objects. Also re-worked
and restructured the entire notify support code for handler
installation, handler removal, notify event queuing, and notify
dispatch to handler.

Extends and updates original commit 3f0be671("ACPI / ACPICA: Multiple
system notify handlers per device") by Rafael Wysocki.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/acpica/acglobal.h

@@ -278,8 +278,7 @@ ACPI_EXTERN acpi_cache_t *acpi_gbl_operand_cache;
 
 /* Global handlers */
 
-ACPI_EXTERN struct acpi_object_notify_handler acpi_gbl_device_notify;
-ACPI_EXTERN struct acpi_object_notify_handler acpi_gbl_system_notify;
+ACPI_EXTERN struct acpi_global_notify_handler acpi_gbl_global_notify[2];
 ACPI_EXTERN acpi_exception_handler acpi_gbl_exception_handler;
 ACPI_EXTERN acpi_init_handler acpi_gbl_init_handler;
 ACPI_EXTERN acpi_tbl_handler acpi_gbl_table_handler;

drivers/acpi/acpica/aclocal.h

@@ -600,13 +600,22 @@ acpi_status(*acpi_parse_downwards) (struct acpi_walk_state * walk_state,
 
 typedef acpi_status(*acpi_parse_upwards) (struct acpi_walk_state * walk_state);
 
+/* Global handlers for AML Notifies */
+
+struct acpi_global_notify_handler {
+	acpi_notify_handler handler;
+	void *context;
+};
+
 /*
  * Notify info - used to pass info to the deferred notify
  * handler/dispatcher.
  */
 struct acpi_notify_info {
-	ACPI_STATE_COMMON struct acpi_namespace_node *node;
-	union acpi_operand_object *handler_obj;
+	ACPI_STATE_COMMON u8 handler_list_id;
+	struct acpi_namespace_node *node;
+	union acpi_operand_object *handler_list_head;
+	struct acpi_global_notify_handler *global;
 };
 
 /* Generic state is union of structs above */

drivers/acpi/acpica/acobject.h

@@ -206,8 +206,7 @@ struct acpi_object_method {
  * Common fields for objects that support ASL notifications
  */
 #define ACPI_COMMON_NOTIFY_INFO \
-	union acpi_operand_object       *system_notify;     /* Handler for system notifies */\
-	union acpi_operand_object       *device_notify;     /* Handler for driver notifies */\
+	union acpi_operand_object       *notify_list[2];    /* Handlers for system/device notifies */\
 	union acpi_operand_object       *handler;	/* Handler for Address space */
 
 struct acpi_object_notify_common {	/* COMMON NOTIFY for POWER, PROCESSOR, DEVICE, and THERMAL */
@@ -296,10 +295,10 @@ struct acpi_object_buffer_field {
 
 struct acpi_object_notify_handler {
 	ACPI_OBJECT_COMMON_HEADER struct acpi_namespace_node *node;	/* Parent device */
-	u32 handler_type;
-	acpi_notify_handler handler;
+	u32 handler_type;	/* Type: Device/System/Both */
+	acpi_notify_handler handler;	/* Handler address */
 	void *context;
-	struct acpi_object_notify_handler *next;
+	union acpi_operand_object *next[2];	/* Device and System handler lists */
 };
 
 struct acpi_object_addr_handler {

drivers/acpi/acpica/evmisc.c

@@ -101,102 +101,77 @@ acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
 			     u32 notify_value)
 {
 	union acpi_operand_object *obj_desc;
-	union acpi_operand_object *handler_obj = NULL;
-	union acpi_generic_state *notify_info;
+	union acpi_operand_object *handler_list_head = NULL;
+	union acpi_generic_state *info;
+	u8 handler_list_id = 0;
 	acpi_status status = AE_OK;
 
 	ACPI_FUNCTION_NAME(ev_queue_notify_request);
 
-	/*
-	 * For value 0x03 (Ejection Request), may need to run a device method.
-	 * For value 0x02 (Device Wake), if _PRW exists, may need to run
-	 *   the _PS0 method.
-	 * For value 0x80 (Status Change) on the power button or sleep button,
-	 *   initiate soft-off or sleep operation.
-	 *
-	 * For all cases, simply dispatch the notify to the handler.
-	 */
-	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-			  "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
-			  acpi_ut_get_node_name(node),
-			  acpi_ut_get_type_name(node->type), notify_value,
-			  acpi_ut_get_notify_name(notify_value), node));
-
-	/* Get the notify object attached to the NS Node */
-
-	obj_desc = acpi_ns_get_attached_object(node);
-	if (obj_desc) {
-
-		/* We have the notify object, Get the correct handler */
-
-		switch (node->type) {
+	/* Are Notifies allowed on this object? */
 
-			/* Notify is allowed only on these types */
+	if (!acpi_ev_is_notify_object(node)) {
+		return (AE_TYPE);
+	}
 
-		case ACPI_TYPE_DEVICE:
-		case ACPI_TYPE_THERMAL:
-		case ACPI_TYPE_PROCESSOR:
+	/* Get the correct notify list type (System or Device) */
 
 	if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
-				handler_obj =
-				    obj_desc->common_notify.system_notify;
+		handler_list_id = ACPI_SYSTEM_HANDLER_LIST;
 	} else {
-				handler_obj =
-				    obj_desc->common_notify.device_notify;
+		handler_list_id = ACPI_DEVICE_HANDLER_LIST;
 	}
-			break;
 
-		default:
+	/* Get the notify object attached to the namespace Node */
 
-			/* All other types are not supported */
+	obj_desc = acpi_ns_get_attached_object(node);
+	if (obj_desc) {
 
-			return (AE_TYPE);
-		}
+		/* We have an attached object, Get the correct handler list */
+
+		handler_list_head =
+		    obj_desc->common_notify.notify_list[handler_list_id];
 	}
 
 	/*
-	 * If there is a handler to run, schedule the dispatcher.
-	 * Check for:
-	 * 1) Global system notify handler
-	 * 2) Global device notify handler
-	 * 3) Per-device notify handler
+	 * If there is no notify handler (Global or Local)
+	 * for this object, just ignore the notify
 	 */
-	if ((acpi_gbl_system_notify.handler &&
-	     (notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
-	    (acpi_gbl_device_notify.handler &&
-	     (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
-		notify_info = acpi_ut_create_generic_state();
-		if (!notify_info) {
-			return (AE_NO_MEMORY);
-		}
-
-		if (!handler_obj) {
+	if (!acpi_gbl_global_notify[handler_list_id].handler
+	    && !handler_list_head) {
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-					  "Executing system notify handler for Notify (%4.4s, %X) "
-					  "node %p\n",
-					  acpi_ut_get_node_name(node),
-					  notify_value, node));
+				  "No notify handler for Notify, ignoring (%4.4s, %X) node %p\n",
+				  acpi_ut_get_node_name(node), notify_value,
+				  node));
+
+		return (AE_OK);
 	}
 
-		notify_info->common.descriptor_type =
-		    ACPI_DESC_TYPE_STATE_NOTIFY;
-		notify_info->notify.node = node;
-		notify_info->notify.value = (u16) notify_value;
-		notify_info->notify.handler_obj = handler_obj;
+	/* Setup notify info and schedule the notify dispatcher */
 
-		status =
-		    acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
-				    notify_info);
-		if (ACPI_FAILURE(status)) {
-			acpi_ut_delete_generic_state(notify_info);
+	info = acpi_ut_create_generic_state();
+	if (!info) {
+		return (AE_NO_MEMORY);
 	}
-	} else {
-		/* There is no notify handler (per-device or system) for this device */
+
+	info->common.descriptor_type = ACPI_DESC_TYPE_STATE_NOTIFY;
+
+	info->notify.node = node;
+	info->notify.value = (u16)notify_value;
+	info->notify.handler_list_id = handler_list_id;
+	info->notify.handler_list_head = handler_list_head;
+	info->notify.global = &acpi_gbl_global_notify[handler_list_id];
 
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "No notify handler for Notify (%4.4s, %X) node %p\n",
-				  acpi_ut_get_node_name(node), notify_value,
-				  node));
+			  "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
+			  acpi_ut_get_node_name(node),
+			  acpi_ut_get_type_name(node->type), notify_value,
+			  acpi_ut_get_notify_name(notify_value), node));
+
+	status = acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
+				 info);
+	if (ACPI_FAILURE(status)) {
+		acpi_ut_delete_generic_state(info);
 	}
 
 	return (status);
@@ -217,60 +192,34 @@ acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
 
 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
 {
-	union acpi_generic_state *notify_info =
-	    (union acpi_generic_state *)context;
-	acpi_notify_handler global_handler = NULL;
-	void *global_context = NULL;
+	union acpi_generic_state *info = (union acpi_generic_state *)context;
 	union acpi_operand_object *handler_obj;
 
 	ACPI_FUNCTION_ENTRY();
 
-	/*
-	 * We will invoke a global notify handler if installed. This is done
-	 * _before_ we invoke the per-device handler attached to the device.
-	 */
-	if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
-
-		/* Global system notification handler */
+	/* Invoke a global notify handler if installed */
 
-		if (acpi_gbl_system_notify.handler) {
-			global_handler = acpi_gbl_system_notify.handler;
-			global_context = acpi_gbl_system_notify.context;
+	if (info->notify.global->handler) {
+		info->notify.global->handler(info->notify.node,
+					     info->notify.value,
+					     info->notify.global->context);
 	}
-	} else {
-		/* Global driver notification handler */
 
-		if (acpi_gbl_device_notify.handler) {
-			global_handler = acpi_gbl_device_notify.handler;
-			global_context = acpi_gbl_device_notify.context;
-		}
-	}
-
-	/* Invoke the system handler first, if present */
-
-	if (global_handler) {
-		global_handler(notify_info->notify.node,
-			       notify_info->notify.value, global_context);
-	}
+	/* Now invoke the local notify handler(s) if any are installed */
 
-	/* Now invoke the per-device handler, if present */
+	handler_obj = info->notify.handler_list_head;
+	while (handler_obj) {
+		handler_obj->notify.handler(info->notify.node,
+					    info->notify.value,
+					    handler_obj->notify.context);
 
-	handler_obj = notify_info->notify.handler_obj;
-	if (handler_obj) {
-		struct acpi_object_notify_handler *notifier;
-
-		notifier = &handler_obj->notify;
-		while (notifier) {
-			notifier->handler(notify_info->notify.node,
-					  notify_info->notify.value,
-					  notifier->context);
-			notifier = notifier->next;
-		}
+		handler_obj =
+		    handler_obj->notify.next[info->notify.handler_list_id];
 	}
 
 	/* All done with the info object */
 
-	acpi_ut_delete_generic_state(notify_info);
+	acpi_ut_delete_generic_state(info);
 }
 
 #if (!ACPI_REDUCED_HARDWARE)

drivers/acpi/acpica/evxface.c

@@ -52,88 +52,27 @@
 ACPI_MODULE_NAME("evxface")
 
 
-/*******************************************************************************
- *
- * FUNCTION:    acpi_populate_handler_object
- *
- * PARAMETERS:  handler_obj        - Handler object to populate
- *              handler_type       - The type of handler:
- *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
- *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
- *                                  ACPI_ALL_NOTIFY:  both system and device
- *              handler            - Address of the handler
- *              context            - Value passed to the handler on each GPE
- *              next               - Address of a handler object to link to
- *
- * RETURN:      None
- *
- * DESCRIPTION: Populate a handler object.
- *
- ******************************************************************************/
-static void
-acpi_populate_handler_object(struct acpi_object_notify_handler *handler_obj,
-			     u32 handler_type,
-			     acpi_notify_handler handler, void *context,
-			     struct acpi_object_notify_handler *next)
-{
-	handler_obj->handler_type = handler_type;
-	handler_obj->handler = handler;
-	handler_obj->context = context;
-	handler_obj->next = next;
-}
-
-/*******************************************************************************
- *
- * FUNCTION:    acpi_add_handler_object
- *
- * PARAMETERS:  parent_obj         - Parent of the new object
- *              handler            - Address of the handler
- *              context            - Value passed to the handler on each GPE
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Create a new handler object and populate it.
- *
- ******************************************************************************/
-static acpi_status
-acpi_add_handler_object(struct acpi_object_notify_handler *parent_obj,
-			acpi_notify_handler handler, void *context)
-{
-	struct acpi_object_notify_handler *handler_obj;
-
-	/* The parent must not be a defice notify handler object. */
-	if (parent_obj->handler_type & ACPI_DEVICE_NOTIFY)
-		return AE_BAD_PARAMETER;
-
-	handler_obj = ACPI_ALLOCATE_ZEROED(sizeof(*handler_obj));
-	if (!handler_obj)
-		return AE_NO_MEMORY;
-
-	acpi_populate_handler_object(handler_obj,
-					ACPI_SYSTEM_NOTIFY,
-					handler, context,
-					parent_obj->next);
-	parent_obj->next = handler_obj;
-
-	return AE_OK;
-}
-
-
 /*******************************************************************************
  *
  * FUNCTION:    acpi_install_notify_handler
  *
  * PARAMETERS:  Device          - The device for which notifies will be handled
  *              handler_type    - The type of handler:
- *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
- *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
- *                                  ACPI_ALL_NOTIFY:  both system and device
+ *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
+ *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
+ *                                  ACPI_ALL_NOTIFY:    Both System and Device
  *              Handler         - Address of the handler
  *              Context         - Value passed to the handler on each GPE
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Install a handler for notifies on an ACPI device
+ * DESCRIPTION: Install a handler for notifications on an ACPI Device,
+ *              thermal_zone, or Processor object.
+ *
+ * NOTES:       The Root namespace object may have only one handler for each
+ *              type of notify (System/Device). Device/Thermal/Processor objects
+ *              may have one device notify handler, and multiple system notify
+ *              handlers.
  *
  ******************************************************************************/
 acpi_status
@@ -141,17 +80,19 @@ acpi_install_notify_handler(acpi_handle device,
 			    u32 handler_type,
 			    acpi_notify_handler handler, void *context)
 {
+	struct acpi_namespace_node *node =
+	    ACPI_CAST_PTR(struct acpi_namespace_node, device);
 	union acpi_operand_object *obj_desc;
-	union acpi_operand_object *notify_obj;
-	struct acpi_namespace_node *node;
+	union acpi_operand_object *handler_obj;
 	acpi_status status;
+	u32 i;
 
 	ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
 
 	/* Parameter validation */
 
-	if ((!device) ||
-	    (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
+	if ((!device) || (!handler) || (!handler_type) ||
+	    (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
 		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
 
@@ -160,92 +101,48 @@ acpi_install_notify_handler(acpi_handle device,
 		return_ACPI_STATUS(status);
 	}
 
-	/* Convert and validate the device handle */
-
-	node = acpi_ns_validate_handle(device);
-	if (!node) {
-		status = AE_BAD_PARAMETER;
-		goto unlock_and_exit;
-	}
-
 	/*
 	 * Root Object:
 	 * Registering a notify handler on the root object indicates that the
 	 * caller wishes to receive notifications for all objects. Note that
-	 * only one <external> global handler can be regsitered (per notify type).
+	 * only one global handler can be registered per notify type.
+	 * Ensure that a handler is not already installed.
 	 */
 	if (device == ACPI_ROOT_OBJECT) {
-
-		/* Make sure the handler is not already installed */
-
-		if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
-		     acpi_gbl_system_notify.handler) ||
-		    ((handler_type & ACPI_DEVICE_NOTIFY) &&
-		     acpi_gbl_device_notify.handler)) {
+		for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+			if (handler_type & (i + 1)) {
+				if (acpi_gbl_global_notify[i].handler) {
 					status = AE_ALREADY_EXISTS;
 					goto unlock_and_exit;
 				}
 
-		if (handler_type & ACPI_SYSTEM_NOTIFY) {
-			acpi_gbl_system_notify.node = node;
-			acpi_gbl_system_notify.handler = handler;
-			acpi_gbl_system_notify.context = context;
+				acpi_gbl_global_notify[i].handler = handler;
+				acpi_gbl_global_notify[i].context = context;
 			}
-
-		if (handler_type & ACPI_DEVICE_NOTIFY) {
-			acpi_gbl_device_notify.node = node;
-			acpi_gbl_device_notify.handler = handler;
-			acpi_gbl_device_notify.context = context;
 		}
 
-		/* Global notify handler installed */
+		goto unlock_and_exit;	/* Global notify handler installed, all done */
 	}
 
 	/*
 	 * All Other Objects:
-	 * Caller will only receive notifications specific to the target object.
-	 * Note that only certain object types can receive notifications.
+	 * Caller will only receive notifications specific to the target
+	 * object. Note that only certain object types are allowed to
+	 * receive notifications.
 	 */
-	else {
-		/* Notifies allowed on this object? */
+
+	/* Are Notifies allowed on this object? */
 
 	if (!acpi_ev_is_notify_object(node)) {
 		status = AE_TYPE;
 		goto unlock_and_exit;
 	}
 
-		/* Check for an existing internal object */
+	/* Check for an existing internal object, might not exist */
 
 	obj_desc = acpi_ns_get_attached_object(node);
-		if (obj_desc) {
-
-			/* Object exists. */
-
-			/* For a device notify, make sure there's no handler. */
-			if ((handler_type & ACPI_DEVICE_NOTIFY) &&
-			     obj_desc->common_notify.device_notify) {
-				status = AE_ALREADY_EXISTS;
-				goto unlock_and_exit;
-			}
-
-			/* System notifies may have more handlers installed. */
-			notify_obj = obj_desc->common_notify.system_notify;
-
-			if ((handler_type & ACPI_SYSTEM_NOTIFY) && notify_obj) {
-				struct acpi_object_notify_handler *parent_obj;
-
-				if (handler_type & ACPI_DEVICE_NOTIFY) {
-					status = AE_ALREADY_EXISTS;
-					goto unlock_and_exit;
-				}
+	if (!obj_desc) {
 
-				parent_obj = &notify_obj->notify;
-				status = acpi_add_handler_object(parent_obj,
-								 handler,
-								 context);
-				goto unlock_and_exit;
-			}
-		} else {
 		/* Create a new object */
 
 		obj_desc = acpi_ut_create_internal_object(node->type);
@@ -254,50 +151,62 @@ acpi_install_notify_handler(acpi_handle device,
 			goto unlock_and_exit;
 		}
 
-			/* Attach new object to the Node */
-
-			status =
-			    acpi_ns_attach_object(device, obj_desc, node->type);
-
-			/* Remove local reference to the object */
+		/* Attach new object to the Node, remove local reference */
 
+		status = acpi_ns_attach_object(device, obj_desc, node->type);
 		acpi_ut_remove_reference(obj_desc);
 		if (ACPI_FAILURE(status)) {
 			goto unlock_and_exit;
 		}
 	}
 
-		/* Install the handler */
+	/* Ensure that the handler is not already installed in the lists */
 
-		notify_obj =
-		    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
-		if (!notify_obj) {
-			status = AE_NO_MEMORY;
+	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+		if (handler_type & (i + 1)) {
+			handler_obj = obj_desc->common_notify.notify_list[i];
+			while (handler_obj) {
+				if (handler_obj->notify.handler == handler) {
+					status = AE_ALREADY_EXISTS;
 					goto unlock_and_exit;
 				}
 
-		acpi_populate_handler_object(&notify_obj->notify,
-						handler_type,
-						handler, context,
-						NULL);
-
-		if (handler_type & ACPI_SYSTEM_NOTIFY) {
-			obj_desc->common_notify.system_notify = notify_obj;
+				handler_obj = handler_obj->notify.next[i];
 			}
+		}
+	}
+
+	/* Create and populate a new notify handler object */
 
-		if (handler_type & ACPI_DEVICE_NOTIFY) {
-			obj_desc->common_notify.device_notify = notify_obj;
+	handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
+	if (!handler_obj) {
+		status = AE_NO_MEMORY;
+		goto unlock_and_exit;
 	}
 
-		if (handler_type == ACPI_ALL_NOTIFY) {
+	handler_obj->notify.node = node;
+	handler_obj->notify.handler_type = handler_type;
+	handler_obj->notify.handler = handler;
+	handler_obj->notify.context = context;
+
+	/* Install the handler at the list head(s) */
 
-			/* Extra ref if installed in both */
+	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+		if (handler_type & (i + 1)) {
+			handler_obj->notify.next[i] =
+			    obj_desc->common_notify.notify_list[i];
 
-			acpi_ut_add_reference(notify_obj);
+			obj_desc->common_notify.notify_list[i] = handler_obj;
 		}
 	}
 
-      unlock_and_exit:
+	/* Add an extra reference if handler was installed in both lists */
+
+	if (handler_type == ACPI_ALL_NOTIFY) {
+		acpi_ut_add_reference(handler_obj);
+	}
+
+unlock_and_exit:
 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 	return_ACPI_STATUS(status);
 }
@@ -308,11 +217,11 @@ ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
  *
  * FUNCTION:    acpi_remove_notify_handler
  *
- * PARAMETERS:  Device          - The device for which notifies will be handled
+ * PARAMETERS:  Device          - The device for which the handler is installed
  *              handler_type    - The type of handler:
- *                                  ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
- *                                  ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
- *                                  ACPI_ALL_NOTIFY:  both system and device
+ *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
+ *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
+ *                                  ACPI_ALL_NOTIFY:    Both System and Device
  *              Handler         - Address of the handler
  *
  * RETURN:      Status
@@ -324,76 +233,62 @@ acpi_status
 acpi_remove_notify_handler(acpi_handle device,
 			   u32 handler_type, acpi_notify_handler handler)
 {
-	union acpi_operand_object *notify_obj;
+	struct acpi_namespace_node *node =
+	    ACPI_CAST_PTR(struct acpi_namespace_node, device);
 	union acpi_operand_object *obj_desc;
-	struct acpi_namespace_node *node;
+	union acpi_operand_object *handler_obj;
+	union acpi_operand_object *previous_handler_obj;
 	acpi_status status;
+	u32 i;
 
 	ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
 
 	/* Parameter validation */
 
-	if ((!device) ||
-	    (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
-		status = AE_BAD_PARAMETER;
-		goto exit;
+	if ((!device) || (!handler) || (!handler_type) ||
+	    (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
 	}
-
-
 	/* Make sure all deferred tasks are completed */
+
 	acpi_os_wait_events_complete(NULL);
 
 	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 	if (ACPI_FAILURE(status)) {
-		goto exit;
-	}
-
-	/* Convert and validate the device handle */
-
-	node = acpi_ns_validate_handle(device);
-	if (!node) {
-		status = AE_BAD_PARAMETER;
-		goto unlock_and_exit;
+		return_ACPI_STATUS(status);
 	}
 
-	/* Root Object */
+	/* Root Object. Global handlers are removed here */
 
 	if (device == ACPI_ROOT_OBJECT) {
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-				  "Removing notify handler for namespace root object\n"));
-
-		if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
-		     !acpi_gbl_system_notify.handler) ||
-		    ((handler_type & ACPI_DEVICE_NOTIFY) &&
-		     !acpi_gbl_device_notify.handler)) {
+		for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+			if (handler_type & (i + 1)) {
+				if (!acpi_gbl_global_notify[i].handler ||
+				    (acpi_gbl_global_notify[i].handler !=
+				     handler)) {
 					status = AE_NOT_EXIST;
 					goto unlock_and_exit;
 				}
 
-		if (handler_type & ACPI_SYSTEM_NOTIFY) {
-			acpi_gbl_system_notify.node = NULL;
-			acpi_gbl_system_notify.handler = NULL;
-			acpi_gbl_system_notify.context = NULL;
-		}
+				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+						  "Removing global notify handler\n"));
 
-		if (handler_type & ACPI_DEVICE_NOTIFY) {
-			acpi_gbl_device_notify.node = NULL;
-			acpi_gbl_device_notify.handler = NULL;
-			acpi_gbl_device_notify.context = NULL;
+				acpi_gbl_global_notify[i].handler = NULL;
+				acpi_gbl_global_notify[i].context = NULL;
 			}
 		}
 
-	/* All Other Objects */
+		goto unlock_and_exit;
+	}
 
-	else {
-		/* Notifies allowed on this object? */
+	/* All other objects: Are Notifies allowed on this object? */
 
 	if (!acpi_ev_is_notify_object(node)) {
 		status = AE_TYPE;
 		goto unlock_and_exit;
 	}
 
-		/* Check for an existing internal object */
+	/* Must have an existing internal object */
 
 	obj_desc = acpi_ns_get_attached_object(node);
 	if (!obj_desc) {
@@ -401,88 +296,43 @@ acpi_remove_notify_handler(acpi_handle device,
 		goto unlock_and_exit;
 	}
 
-		/* Object exists - make sure there's an existing handler */
+	/* Internal object exists. Find the handler and remove it */
 
-		if (handler_type & ACPI_SYSTEM_NOTIFY) {
-			struct acpi_object_notify_handler *handler_obj;
-			struct acpi_object_notify_handler *parent_obj;
+	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+		if (handler_type & (i + 1)) {
+			handler_obj = obj_desc->common_notify.notify_list[i];
+			previous_handler_obj = NULL;
 
-			notify_obj = obj_desc->common_notify.system_notify;
-			if (!notify_obj) {
-				status = AE_NOT_EXIST;
-				goto unlock_and_exit;
-			}
+			/* Attempt to find the handler in the handler list */
 
-			handler_obj = &notify_obj->notify;
-			parent_obj = NULL;
-			while (handler_obj->handler != handler) {
-				if (handler_obj->next) {
-					parent_obj = handler_obj;
-					handler_obj = handler_obj->next;
-				} else {
-					break;
-				}
+			while (handler_obj &&
+			       (handler_obj->notify.handler != handler)) {
+				previous_handler_obj = handler_obj;
+				handler_obj = handler_obj->notify.next[i];
 			}
 
-			if (handler_obj->handler != handler) {
-				status = AE_BAD_PARAMETER;
+			if (!handler_obj) {
+				status = AE_NOT_EXIST;
 				goto unlock_and_exit;
 			}
 
-			/*
-			 * Remove the handler.  There are three possible cases.
-			 * First, we may need to remove a non-embedded object.
-			 * Second, we may need to remove the embedded object's
-			 * handler data, while non-embedded objects exist.
-			 * Finally, we may need to remove the embedded object
-			 * entirely along with its container.
-			 */
-			if (parent_obj) {
-				/* Non-embedded object is being removed. */
-				parent_obj->next = handler_obj->next;
-				ACPI_FREE(handler_obj);
-			} else if (notify_obj->notify.next) {
-				/*
-				 * The handler matches the embedded object, but
-				 * there are more handler objects in the list.
-				 * Replace the embedded object's data with the
-				 * first next object's data and remove that
-				 * object.
-				 */
-				parent_obj = &notify_obj->notify;
-				handler_obj = notify_obj->notify.next;
-				*parent_obj = *handler_obj;
-				ACPI_FREE(handler_obj);
-			} else {
-				/* No more handler objects in the list. */
-				obj_desc->common_notify.system_notify = NULL;
-				acpi_ut_remove_reference(notify_obj);
-			}
-		}
+			/* Remove the handler object from the list */
 
-		if (handler_type & ACPI_DEVICE_NOTIFY) {
-			notify_obj = obj_desc->common_notify.device_notify;
-			if (!notify_obj) {
-				status = AE_NOT_EXIST;
-				goto unlock_and_exit;
-			}
+			if (previous_handler_obj) {	/* Handler is not at the list head */
+				previous_handler_obj->notify.next[i] =
+				    handler_obj->notify.next[i];
+			} else {	/* Handler is at the list head */
 
-			if (notify_obj->notify.handler != handler) {
-				status = AE_BAD_PARAMETER;
-				goto unlock_and_exit;
+				obj_desc->common_notify.notify_list[i] =
+				    handler_obj->notify.next[i];
 			}
 
-			/* Remove the handler */
-			obj_desc->common_notify.device_notify = NULL;
-			acpi_ut_remove_reference(notify_obj);
+			acpi_ut_remove_reference(handler_obj);
 		}
 	}
 
-      unlock_and_exit:
+unlock_and_exit:
 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
-      exit:
-	if (ACPI_FAILURE(status))
-		ACPI_EXCEPTION((AE_INFO, status, "Removing notify handler"));
 	return_ACPI_STATUS(status);
 }
 

drivers/acpi/acpica/exdump.c

@@ -109,9 +109,9 @@ static struct acpi_exdump_info acpi_ex_dump_package[5] = {
 static struct acpi_exdump_info acpi_ex_dump_device[4] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_device), NULL},
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(device.handler), "Handler"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(device.system_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(device.notify_list[0]),
 	 "System Notify"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(device.device_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(device.notify_list[1]),
 	 "Device Notify"}
 };
 
@@ -158,9 +158,9 @@ static struct acpi_exdump_info acpi_ex_dump_power[5] = {
 	 "System Level"},
 	{ACPI_EXD_UINT32, ACPI_EXD_OFFSET(power_resource.resource_order),
 	 "Resource Order"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(power_resource.system_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(power_resource.notify_list[0]),
 	 "System Notify"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(power_resource.device_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(power_resource.notify_list[1]),
 	 "Device Notify"}
 };
 
@@ -169,18 +169,18 @@ static struct acpi_exdump_info acpi_ex_dump_processor[7] = {
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(processor.proc_id), "Processor ID"},
 	{ACPI_EXD_UINT8, ACPI_EXD_OFFSET(processor.length), "Length"},
 	{ACPI_EXD_ADDRESS, ACPI_EXD_OFFSET(processor.address), "Address"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(processor.system_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(processor.notify_list[0]),
 	 "System Notify"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(processor.device_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(processor.notify_list[1]),
 	 "Device Notify"},
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(processor.handler), "Handler"}
 };
 
 static struct acpi_exdump_info acpi_ex_dump_thermal[4] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_thermal), NULL},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(thermal_zone.system_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(thermal_zone.notify_list[0]),
 	 "System Notify"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(thermal_zone.device_notify),
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(thermal_zone.notify_list[1]),
 	 "Device Notify"},
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(thermal_zone.handler), "Handler"}
 };
@@ -241,10 +241,15 @@ static struct acpi_exdump_info acpi_ex_dump_address_handler[6] = {
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(address_space.context), "Context"}
 };
 
-static struct acpi_exdump_info acpi_ex_dump_notify[3] = {
+static struct acpi_exdump_info acpi_ex_dump_notify[7] = {
 	{ACPI_EXD_INIT, ACPI_EXD_TABLE_SIZE(acpi_ex_dump_notify), NULL},
 	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(notify.node), "Node"},
-	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(notify.context), "Context"}
+	{ACPI_EXD_UINT32, ACPI_EXD_OFFSET(notify.handler_type), "Handler Type"},
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(notify.handler), "Handler"},
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(notify.context), "Context"},
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(notify.next[0]),
+	 "Next System Notify"},
+	{ACPI_EXD_POINTER, ACPI_EXD_OFFSET(notify.next[1]), "Next Device Notify"}
 };
 
 /* Miscellaneous tables */

drivers/acpi/acpica/utdelete.c

@@ -152,7 +152,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
 	case ACPI_TYPE_PROCESSOR:
 	case ACPI_TYPE_THERMAL:
 
-		/* Walk the notify handler list for this object */
+		/* Walk the address handler list for this object */
 
 		handler_desc = object->common_notify.handler;
 		while (handler_desc) {
@@ -480,6 +480,7 @@ acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
 	acpi_status status = AE_OK;
 	union acpi_generic_state *state_list = NULL;
 	union acpi_operand_object *next_object = NULL;
+	union acpi_operand_object *prev_object;
 	union acpi_generic_state *state;
 	u32 i;
 
@@ -505,12 +506,21 @@ acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action)
 		case ACPI_TYPE_POWER:
 		case ACPI_TYPE_THERMAL:
 
-			/* Update the notify objects for these types (if present) */
-
-			acpi_ut_update_ref_count(object->common_notify.
-						 system_notify, action);
-			acpi_ut_update_ref_count(object->common_notify.
-						 device_notify, action);
+			/*
+			 * Update the notify objects for these types (if present)
+			 * Two lists, system and device notify handlers.
+			 */
+			for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
+				prev_object =
+				    object->common_notify.notify_list[i];
+				while (prev_object) {
+					next_object =
+					    prev_object->notify.next[i];
+					acpi_ut_update_ref_count(prev_object,
+								 action);
+					prev_object = next_object;
+				}
+			}
 			break;
 
 		case ACPI_TYPE_PACKAGE:

drivers/acpi/acpica/utglobal.c

@@ -304,8 +304,8 @@ acpi_status acpi_ut_init_globals(void)
 
 	/* Global handlers */
 
-	acpi_gbl_system_notify.handler = NULL;
-	acpi_gbl_device_notify.handler = NULL;
+	acpi_gbl_global_notify[0].handler = NULL;
+	acpi_gbl_global_notify[1].handler = NULL;
 	acpi_gbl_exception_handler = NULL;
 	acpi_gbl_init_handler = NULL;
 	acpi_gbl_table_handler = NULL;

include/acpi/actypes.h

@@ -706,10 +706,14 @@ typedef u32 acpi_event_status;
 #define ACPI_DEVICE_NOTIFY              0x2
 #define ACPI_ALL_NOTIFY                 (ACPI_SYSTEM_NOTIFY | ACPI_DEVICE_NOTIFY)
 #define ACPI_MAX_NOTIFY_HANDLER_TYPE    0x3
+#define ACPI_NUM_NOTIFY_TYPES           2
 
 #define ACPI_MAX_SYS_NOTIFY             0x7F
 #define ACPI_MAX_DEVICE_SPECIFIC_NOTIFY 0xBF
 
+#define ACPI_SYSTEM_HANDLER_LIST        0	/* Used as index, must be SYSTEM_NOTIFY -1 */
+#define ACPI_DEVICE_HANDLER_LIST        1	/* Used as index, must be DEVICE_NOTIFY -1 */
+
 /* Address Space (Operation Region) Types */
 
 typedef u8 acpi_adr_space_type;