drivers/acpi/utilities/utdelete.c - kernel/msm-4.9 - Gitiles

 /*******************************************************************************
  *
  * Module Name: utdelete - object deletion and reference count utilities
  *
  ******************************************************************************/

 /*
  * Copyright (C) 2000 - 2008, Intel Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions, and the following disclaimer,
  *    without modification.
  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  *    substantially similar to the "NO WARRANTY" disclaimer below
  *    ("Disclaimer") and any redistribution must be conditioned upon
  *    including a substantially similar Disclaimer requirement for further
  *    binary redistribution.
  * 3. Neither the names of the above-listed copyright holders nor the names
  *    of any contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * Alternatively, this software may be distributed under the terms of the
  * GNU General Public License ("GPL") version 2 as published by the Free
  * Software Foundation.
  *
  * NO WARRANTY
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGES.
  */

 #include <acpi/acpi.h>
 #include <acpi/acinterp.h>
 #include <acpi/acnamesp.h>
 #include <acpi/acevents.h>
 #include <acpi/amlcode.h>

 #define _COMPONENT          ACPI_UTILITIES
 ACPI_MODULE_NAME("utdelete")

 /* Local prototypes */
 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);

 static void
 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_delete_internal_obj
  *
  * PARAMETERS:  Object         - Object to be deleted
  *
  * RETURN:      None
  *
  * DESCRIPTION: Low level object deletion, after reference counts have been
  *              updated (All reference counts, including sub-objects!)
  *
  ******************************************************************************/

 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
 {
 	void *obj_pointer = NULL;
 	union acpi_operand_object *handler_desc;
 	union acpi_operand_object *second_desc;
 	union acpi_operand_object *next_desc;

 	ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);

 	if (!object) {
 		return_VOID;
 	}

 	/*
 	 * Must delete or free any pointers within the object that are not
 	 * actual ACPI objects (for example, a raw buffer pointer).
 	 */
 	switch (ACPI_GET_OBJECT_TYPE(object)) {
 	case ACPI_TYPE_STRING:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "**** String %p, ptr %p\n", object,
 				  object->string.pointer));

 		/* Free the actual string buffer */

 		if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {

 			/* But only if it is NOT a pointer into an ACPI table */

 			obj_pointer = object->string.pointer;
 		}
 		break;

 	case ACPI_TYPE_BUFFER:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "**** Buffer %p, ptr %p\n", object,
 				  object->buffer.pointer));

 		/* Free the actual buffer */

 		if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {

 			/* But only if it is NOT a pointer into an ACPI table */

 			obj_pointer = object->buffer.pointer;
 		}
 		break;

 	case ACPI_TYPE_PACKAGE:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  " **** Package of count %X\n",
 				  object->package.count));

 		/*
 		 * Elements of the package are not handled here, they are deleted
 		 * separately
 		 */

 		/* Free the (variable length) element pointer array */

 		obj_pointer = object->package.elements;
 		break;

 	case ACPI_TYPE_DEVICE:

 		if (object->device.gpe_block) {
 			(void)acpi_ev_delete_gpe_block(object->device.
 						       gpe_block);
 		}

 		/* Walk the handler list for this device */

 		handler_desc = object->device.handler;
 		while (handler_desc) {
 			next_desc = handler_desc->address_space.next;
 			acpi_ut_remove_reference(handler_desc);
 			handler_desc = next_desc;
 		}
 		break;

 	case ACPI_TYPE_MUTEX:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Mutex %p, OS Mutex %p\n",
 				  object, object->mutex.os_mutex));

 		if (object == acpi_gbl_global_lock_mutex) {

 			/* Global Lock has extra semaphore */

 			(void)
 			    acpi_os_delete_semaphore
 			    (acpi_gbl_global_lock_semaphore);
 			acpi_gbl_global_lock_semaphore = NULL;

 			acpi_os_delete_mutex(object->mutex.os_mutex);
 			acpi_gbl_global_lock_mutex = NULL;
 		} else {
 			acpi_ex_unlink_mutex(object);
 			acpi_os_delete_mutex(object->mutex.os_mutex);
 		}
 		break;

 	case ACPI_TYPE_EVENT:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Event %p, OS Semaphore %p\n",
 				  object, object->event.os_semaphore));

 		(void)acpi_os_delete_semaphore(object->event.os_semaphore);
 		object->event.os_semaphore = NULL;
 		break;

 	case ACPI_TYPE_METHOD:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Method %p\n", object));

 		/* Delete the method mutex if it exists */

 		if (object->method.mutex) {
 			acpi_os_delete_mutex(object->method.mutex->mutex.
 					     os_mutex);
 			acpi_ut_delete_object_desc(object->method.mutex);
 			object->method.mutex = NULL;
 		}
 		break;

 	case ACPI_TYPE_REGION:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Region %p\n", object));

 		second_desc = acpi_ns_get_secondary_object(object);
 		if (second_desc) {
 			/*
 			 * Free the region_context if and only if the handler is one of the
 			 * default handlers -- and therefore, we created the context object
 			 * locally, it was not created by an external caller.
 			 */
 			handler_desc = object->region.handler;
 			if (handler_desc) {
 				if (handler_desc->address_space.handler_flags &
 				    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {

 					/* Deactivate region and free region context */

 					if (handler_desc->address_space.setup) {
 						(void)handler_desc->
 						    address_space.setup(object,
 									ACPI_REGION_DEACTIVATE,
 									handler_desc->
 									address_space.
 									context,
 									&second_desc->
 									extra.
 									region_context);
 					}
 				}

 				acpi_ut_remove_reference(handler_desc);
 			}

 			/* Now we can free the Extra object */

 			acpi_ut_delete_object_desc(second_desc);
 		}
 		break;

 	case ACPI_TYPE_BUFFER_FIELD:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Buffer Field %p\n", object));

 		second_desc = acpi_ns_get_secondary_object(object);
 		if (second_desc) {
 			acpi_ut_delete_object_desc(second_desc);
 		}
 		break;

 	case ACPI_TYPE_LOCAL_BANK_FIELD:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "***** Bank Field %p\n", object));

 		second_desc = acpi_ns_get_secondary_object(object);
 		if (second_desc) {
 			acpi_ut_delete_object_desc(second_desc);
 		}
 		break;

 	default:
 		break;
 	}

 	/* Free any allocated memory (pointer within the object) found above */

 	if (obj_pointer) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "Deleting Object Subptr %p\n", obj_pointer));
 		ACPI_FREE(obj_pointer);
 	}

 	/* Now the object can be safely deleted */

 	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
 			  object, acpi_ut_get_object_type_name(object)));

 	acpi_ut_delete_object_desc(object);
 	return_VOID;
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_delete_internal_object_list
  *
  * PARAMETERS:  obj_list        - Pointer to the list to be deleted
  *
  * RETURN:      None
  *
  * DESCRIPTION: This function deletes an internal object list, including both
  *              simple objects and package objects
  *
  ******************************************************************************/

 void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
 {
 	union acpi_operand_object **internal_obj;

 	ACPI_FUNCTION_TRACE(ut_delete_internal_object_list);

 	/* Walk the null-terminated internal list */

 	for (internal_obj = obj_list; *internal_obj; internal_obj++) {
 		acpi_ut_remove_reference(*internal_obj);
 	}

 	/* Free the combined parameter pointer list and object array */

 	ACPI_FREE(obj_list);
 	return_VOID;
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_update_ref_count
  *
  * PARAMETERS:  Object          - Object whose ref count is to be updated
  *              Action          - What to do
  *
  * RETURN:      New ref count
  *
  * DESCRIPTION: Modify the ref count and return it.
  *
  ******************************************************************************/

 static void
 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
 {
 	u16 count;
 	u16 new_count;

 	ACPI_FUNCTION_NAME(ut_update_ref_count);

 	if (!object) {
 		return;
 	}

 	count = object->common.reference_count;
 	new_count = count;

 	/*
 	 * Perform the reference count action (increment, decrement, force delete)
 	 */
 	switch (action) {
 	case REF_INCREMENT:

 		new_count++;
 		object->common.reference_count = new_count;

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "Obj %p Refs=%X, [Incremented]\n",
 				  object, new_count));
 		break;

 	case REF_DECREMENT:

 		if (count < 1) {
 			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 					  "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
 					  object, new_count));

 			new_count = 0;
 		} else {
 			new_count--;

 			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 					  "Obj %p Refs=%X, [Decremented]\n",
 					  object, new_count));
 		}

 		if (ACPI_GET_OBJECT_TYPE(object) == ACPI_TYPE_METHOD) {
 			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 					  "Method Obj %p Refs=%X, [Decremented]\n",
 					  object, new_count));
 		}

 		object->common.reference_count = new_count;
 		if (new_count == 0) {
 			acpi_ut_delete_internal_obj(object);
 		}
 		break;

 	case REF_FORCE_DELETE:

 		ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 				  "Obj %p Refs=%X, Force delete! (Set to 0)\n",
 				  object, count));

 		new_count = 0;
 		object->common.reference_count = new_count;
 		acpi_ut_delete_internal_obj(object);
 		break;

 	default:

 		ACPI_ERROR((AE_INFO, "Unknown action (%X)", action));
 		break;
 	}

 	/*
 	 * Sanity check the reference count, for debug purposes only.
 	 * (A deleted object will have a huge reference count)
 	 */
 	if (count > ACPI_MAX_REFERENCE_COUNT) {
 		ACPI_WARNING((AE_INFO,
 			      "Large Reference Count (%X) in object %p", count,
 			      object));
 	}
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_update_object_reference
  *
  * PARAMETERS:  Object              - Increment ref count for this object
  *                                    and all sub-objects
  *              Action              - Either REF_INCREMENT or REF_DECREMENT or
  *                                    REF_FORCE_DELETE
  *
  * RETURN:      Status
  *
  * DESCRIPTION: Increment the object reference count
  *
  * Object references are incremented when:
  * 1) An object is attached to a Node (namespace object)
  * 2) An object is copied (all subobjects must be incremented)
  *
  * Object references are decremented when:
  * 1) An object is detached from an Node
  *
  ******************************************************************************/

 acpi_status
 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_generic_state *state;
 	acpi_native_uint i;

 	ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference, object);

 	while (object) {

 		/* Make sure that this isn't a namespace handle */

 		if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
 			ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 					  "Object %p is NS handle\n", object));
 			return_ACPI_STATUS(AE_OK);
 		}

 		/*
 		 * All sub-objects must have their reference count incremented also.
 		 * Different object types have different subobjects.
 		 */
 		switch (ACPI_GET_OBJECT_TYPE(object)) {
 		case ACPI_TYPE_DEVICE:
 		case ACPI_TYPE_PROCESSOR:
 		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);
 			break;

 		case ACPI_TYPE_PACKAGE:
 			/*
 			 * We must update all the sub-objects of the package,
 			 * each of whom may have their own sub-objects.
 			 */
 			for (i = 0; i < object->package.count; i++) {
 				/*
 				 * Push each element onto the stack for later processing.
 				 * Note: There can be null elements within the package,
 				 * these are simply ignored
 				 */
 				status =
 				    acpi_ut_create_update_state_and_push
 				    (object->package.elements[i], action,
 				     &state_list);
 				if (ACPI_FAILURE(status)) {
 					goto error_exit;
 				}
 			}
 			break;

 		case ACPI_TYPE_BUFFER_FIELD:

 			next_object = object->buffer_field.buffer_obj;
 			break;

 		case ACPI_TYPE_LOCAL_REGION_FIELD:

 			next_object = object->field.region_obj;
 			break;

 		case ACPI_TYPE_LOCAL_BANK_FIELD:

 			next_object = object->bank_field.bank_obj;
 			status =
 			    acpi_ut_create_update_state_and_push(object->
 								 bank_field.
 								 region_obj,
 								 action,
 								 &state_list);
 			if (ACPI_FAILURE(status)) {
 				goto error_exit;
 			}
 			break;

 		case ACPI_TYPE_LOCAL_INDEX_FIELD:

 			next_object = object->index_field.index_obj;
 			status =
 			    acpi_ut_create_update_state_and_push(object->
 								 index_field.
 								 data_obj,
 								 action,
 								 &state_list);
 			if (ACPI_FAILURE(status)) {
 				goto error_exit;
 			}
 			break;

 		case ACPI_TYPE_LOCAL_REFERENCE:
 			/*
 			 * The target of an Index (a package, string, or buffer) or a named
 			 * reference must track changes to the ref count of the index or
 			 * target object.
 			 */
 			if ((object->reference.opcode == AML_INDEX_OP) ||
 			    (object->reference.opcode == AML_INT_NAMEPATH_OP)) {
 				next_object = object->reference.object;
 			}
 			break;

 		case ACPI_TYPE_REGION:
 		default:
 			break;	/* No subobjects for all other types */
 		}

 		/*
 		 * Now we can update the count in the main object. This can only
 		 * happen after we update the sub-objects in case this causes the
 		 * main object to be deleted.
 		 */
 		acpi_ut_update_ref_count(object, action);
 		object = NULL;

 		/* Move on to the next object to be updated */

 		if (next_object) {
 			object = next_object;
 			next_object = NULL;
 		} else if (state_list) {
 			state = acpi_ut_pop_generic_state(&state_list);
 			object = state->update.object;
 			acpi_ut_delete_generic_state(state);
 		}
 	}

 	return_ACPI_STATUS(AE_OK);

       error_exit:

 	ACPI_EXCEPTION((AE_INFO, status,
 			"Could not update object reference count"));

 	return_ACPI_STATUS(status);
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_add_reference
  *
  * PARAMETERS:  Object          - Object whose reference count is to be
  *                                incremented
  *
  * RETURN:      None
  *
  * DESCRIPTION: Add one reference to an ACPI object
  *
  ******************************************************************************/

 void acpi_ut_add_reference(union acpi_operand_object *object)
 {

 	ACPI_FUNCTION_TRACE_PTR(ut_add_reference, object);

 	/* Ensure that we have a valid object */

 	if (!acpi_ut_valid_internal_object(object)) {
 		return_VOID;
 	}

 	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 			  "Obj %p Current Refs=%X [To Be Incremented]\n",
 			  object, object->common.reference_count));

 	/* Increment the reference count */

 	(void)acpi_ut_update_object_reference(object, REF_INCREMENT);
 	return_VOID;
 }

 /*******************************************************************************
  *
  * FUNCTION:    acpi_ut_remove_reference
  *
  * PARAMETERS:  Object         - Object whose ref count will be decremented
  *
  * RETURN:      None
  *
  * DESCRIPTION: Decrement the reference count of an ACPI internal object
  *
  ******************************************************************************/

 void acpi_ut_remove_reference(union acpi_operand_object *object)
 {

 	ACPI_FUNCTION_TRACE_PTR(ut_remove_reference, object);

 	/*
 	 * Allow a NULL pointer to be passed in, just ignore it. This saves
 	 * each caller from having to check. Also, ignore NS nodes.
 	 *
 	 */
 	if (!object ||
 	    (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
 		return_VOID;
 	}

 	/* Ensure that we have a valid object */

 	if (!acpi_ut_valid_internal_object(object)) {
 		return_VOID;
 	}

 	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
 			  "Obj %p Current Refs=%X [To Be Decremented]\n",
 			  object, object->common.reference_count));

 	/*
 	 * Decrement the reference count, and only actually delete the object
 	 * if the reference count becomes 0. (Must also decrement the ref count
 	 * of all subobjects!)
 	 */
 	(void)acpi_ut_update_object_reference(object, REF_DECREMENT);
 	return_VOID;
 }
	/*******************************************************************************
	*
	* Module Name: utdelete - object deletion and reference count utilities
	*
	******************************************************************************/

	/*
	* Copyright (C) 2000 - 2008, Intel Corp.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions, and the following disclaimer,
	* without modification.
	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	* substantially similar to the "NO WARRANTY" disclaimer below
	* ("Disclaimer") and any redistribution must be conditioned upon
	* including a substantially similar Disclaimer requirement for further
	* binary redistribution.
	* 3. Neither the names of the above-listed copyright holders nor the names
	* of any contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* Alternatively, this software may be distributed under the terms of the
	* GNU General Public License ("GPL") version 2 as published by the Free
	* Software Foundation.
	*
	* NO WARRANTY
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGES.
	*/

	#include <acpi/acpi.h>
	#include <acpi/acinterp.h>
	#include <acpi/acnamesp.h>
	#include <acpi/acevents.h>
	#include <acpi/amlcode.h>

	#define _COMPONENT ACPI_UTILITIES
	ACPI_MODULE_NAME("utdelete")

	/* Local prototypes */
	static void acpi_ut_delete_internal_obj(union acpi_operand_object *object);

	static void
	acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action);

	/*******************************************************************************
	*
	* FUNCTION: acpi_ut_delete_internal_obj
	*
	* PARAMETERS: Object - Object to be deleted
	*
	* RETURN: None
	*
	* DESCRIPTION: Low level object deletion, after reference counts have been
	* updated (All reference counts, including sub-objects!)
	*
	******************************************************************************/

	static void acpi_ut_delete_internal_obj(union acpi_operand_object *object)
	{
	void *obj_pointer = NULL;
	union acpi_operand_object *handler_desc;
	union acpi_operand_object *second_desc;
	union acpi_operand_object *next_desc;

	ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);

	if (!object) {
	return_VOID;
	}

	/*
	* Must delete or free any pointers within the object that are not
	* actual ACPI objects (for example, a raw buffer pointer).
	*/
	switch (ACPI_GET_OBJECT_TYPE(object)) {
	case ACPI_TYPE_STRING:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"**** String %p, ptr %p\n", object,
	object->string.pointer));

	/* Free the actual string buffer */

	if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {

	/* But only if it is NOT a pointer into an ACPI table */

	obj_pointer = object->string.pointer;
	}
	break;

	case ACPI_TYPE_BUFFER:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"**** Buffer %p, ptr %p\n", object,
	object->buffer.pointer));

	/* Free the actual buffer */

	if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {

	/* But only if it is NOT a pointer into an ACPI table */

	obj_pointer = object->buffer.pointer;
	}
	break;

	case ACPI_TYPE_PACKAGE:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	" **** Package of count %X\n",
	object->package.count));

	/*
	* Elements of the package are not handled here, they are deleted
	* separately
	*/

	/* Free the (variable length) element pointer array */

	obj_pointer = object->package.elements;
	break;

	case ACPI_TYPE_DEVICE:

	if (object->device.gpe_block) {
	(void)acpi_ev_delete_gpe_block(object->device.
	gpe_block);
	}

	/* Walk the handler list for this device */

	handler_desc = object->device.handler;
	while (handler_desc) {
	next_desc = handler_desc->address_space.next;
	acpi_ut_remove_reference(handler_desc);
	handler_desc = next_desc;
	}
	break;

	case ACPI_TYPE_MUTEX:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"***** Mutex %p, OS Mutex %p\n",
	object, object->mutex.os_mutex));

	if (object == acpi_gbl_global_lock_mutex) {

	/* Global Lock has extra semaphore */

	(void)
	acpi_os_delete_semaphore
	(acpi_gbl_global_lock_semaphore);
	acpi_gbl_global_lock_semaphore = NULL;

	acpi_os_delete_mutex(object->mutex.os_mutex);
	acpi_gbl_global_lock_mutex = NULL;
	} else {
	acpi_ex_unlink_mutex(object);
	acpi_os_delete_mutex(object->mutex.os_mutex);
	}
	break;

	case ACPI_TYPE_EVENT:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"***** Event %p, OS Semaphore %p\n",
	object, object->event.os_semaphore));

	(void)acpi_os_delete_semaphore(object->event.os_semaphore);
	object->event.os_semaphore = NULL;
	break;

	case ACPI_TYPE_METHOD:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"***** Method %p\n", object));

	/* Delete the method mutex if it exists */

	if (object->method.mutex) {
	acpi_os_delete_mutex(object->method.mutex->mutex.
	os_mutex);
	acpi_ut_delete_object_desc(object->method.mutex);
	object->method.mutex = NULL;
	}
	break;

	case ACPI_TYPE_REGION:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"***** Region %p\n", object));

	second_desc = acpi_ns_get_secondary_object(object);
	if (second_desc) {
	/*
	* Free the region_context if and only if the handler is one of the
	* default handlers -- and therefore, we created the context object
	* locally, it was not created by an external caller.
	*/
	handler_desc = object->region.handler;
	if (handler_desc) {
	if (handler_desc->address_space.handler_flags &
	ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {

	/* Deactivate region and free region context */

	if (handler_desc->address_space.setup) {
	(void)handler_desc->
	address_space.setup(object,
	ACPI_REGION_DEACTIVATE,
	handler_desc->
	address_space.
	context,
	&second_desc->
	extra.
	region_context);
	}
	}

	acpi_ut_remove_reference(handler_desc);
	}

	/* Now we can free the Extra object */

	acpi_ut_delete_object_desc(second_desc);
	}
	break;

	case ACPI_TYPE_BUFFER_FIELD:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"***** Buffer Field %p\n", object));

	second_desc = acpi_ns_get_secondary_object(object);
	if (second_desc) {
	acpi_ut_delete_object_desc(second_desc);
	}
	break;

	case ACPI_TYPE_LOCAL_BANK_FIELD:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"***** Bank Field %p\n", object));

	second_desc = acpi_ns_get_secondary_object(object);
	if (second_desc) {
	acpi_ut_delete_object_desc(second_desc);
	}
	break;

	default:
	break;
	}

	/* Free any allocated memory (pointer within the object) found above */

	if (obj_pointer) {
	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Deleting Object Subptr %p\n", obj_pointer));
	ACPI_FREE(obj_pointer);
	}

	/* Now the object can be safely deleted */

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
	object, acpi_ut_get_object_type_name(object)));

	acpi_ut_delete_object_desc(object);
	return_VOID;
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ut_delete_internal_object_list
	*
	* PARAMETERS: obj_list - Pointer to the list to be deleted
	*
	* RETURN: None
	*
	* DESCRIPTION: This function deletes an internal object list, including both
	* simple objects and package objects
	*
	******************************************************************************/

	void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list)
	{
	union acpi_operand_object **internal_obj;

	ACPI_FUNCTION_TRACE(ut_delete_internal_object_list);

	/* Walk the null-terminated internal list */

	for (internal_obj = obj_list; *internal_obj; internal_obj++) {
	acpi_ut_remove_reference(*internal_obj);
	}

	/* Free the combined parameter pointer list and object array */

	ACPI_FREE(obj_list);
	return_VOID;
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ut_update_ref_count
	*
	* PARAMETERS: Object - Object whose ref count is to be updated
	* Action - What to do
	*
	* RETURN: New ref count
	*
	* DESCRIPTION: Modify the ref count and return it.
	*
	******************************************************************************/

	static void
	acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action)
	{
	u16 count;
	u16 new_count;

	ACPI_FUNCTION_NAME(ut_update_ref_count);

	if (!object) {
	return;
	}

	count = object->common.reference_count;
	new_count = count;

	/*
	* Perform the reference count action (increment, decrement, force delete)
	*/
	switch (action) {
	case REF_INCREMENT:

	new_count++;
	object->common.reference_count = new_count;

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Obj %p Refs=%X, [Incremented]\n",
	object, new_count));
	break;

	case REF_DECREMENT:

	if (count < 1) {
	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Obj %p Refs=%X, can't decrement! (Set to 0)\n",
	object, new_count));

	new_count = 0;
	} else {
	new_count--;

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Obj %p Refs=%X, [Decremented]\n",
	object, new_count));
	}

	if (ACPI_GET_OBJECT_TYPE(object) == ACPI_TYPE_METHOD) {
	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Method Obj %p Refs=%X, [Decremented]\n",
	object, new_count));
	}

	object->common.reference_count = new_count;
	if (new_count == 0) {
	acpi_ut_delete_internal_obj(object);
	}
	break;

	case REF_FORCE_DELETE:

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Obj %p Refs=%X, Force delete! (Set to 0)\n",
	object, count));

	new_count = 0;
	object->common.reference_count = new_count;
	acpi_ut_delete_internal_obj(object);
	break;

	default:

	ACPI_ERROR((AE_INFO, "Unknown action (%X)", action));
	break;
	}

	/*
	* Sanity check the reference count, for debug purposes only.
	* (A deleted object will have a huge reference count)
	*/
	if (count > ACPI_MAX_REFERENCE_COUNT) {
	ACPI_WARNING((AE_INFO,
	"Large Reference Count (%X) in object %p", count,
	object));
	}
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ut_update_object_reference
	*
	* PARAMETERS: Object - Increment ref count for this object
	* and all sub-objects
	* Action - Either REF_INCREMENT or REF_DECREMENT or
	* REF_FORCE_DELETE
	*
	* RETURN: Status
	*
	* DESCRIPTION: Increment the object reference count
	*
	* Object references are incremented when:
	* 1) An object is attached to a Node (namespace object)
	* 2) An object is copied (all subobjects must be incremented)
	*
	* Object references are decremented when:
	* 1) An object is detached from an Node
	*
	******************************************************************************/

	acpi_status
	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_generic_state *state;
	acpi_native_uint i;

	ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference, object);

	while (object) {

	/* Make sure that this isn't a namespace handle */

	if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) {
	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Object %p is NS handle\n", object));
	return_ACPI_STATUS(AE_OK);
	}

	/*
	* All sub-objects must have their reference count incremented also.
	* Different object types have different subobjects.
	*/
	switch (ACPI_GET_OBJECT_TYPE(object)) {
	case ACPI_TYPE_DEVICE:
	case ACPI_TYPE_PROCESSOR:
	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);
	break;

	case ACPI_TYPE_PACKAGE:
	/*
	* We must update all the sub-objects of the package,
	* each of whom may have their own sub-objects.
	*/
	for (i = 0; i < object->package.count; i++) {
	/*
	* Push each element onto the stack for later processing.
	* Note: There can be null elements within the package,
	* these are simply ignored
	*/
	status =
	acpi_ut_create_update_state_and_push
	(object->package.elements[i], action,
	&state_list);
	if (ACPI_FAILURE(status)) {
	goto error_exit;
	}
	}
	break;

	case ACPI_TYPE_BUFFER_FIELD:

	next_object = object->buffer_field.buffer_obj;
	break;

	case ACPI_TYPE_LOCAL_REGION_FIELD:

	next_object = object->field.region_obj;
	break;

	case ACPI_TYPE_LOCAL_BANK_FIELD:

	next_object = object->bank_field.bank_obj;
	status =
	acpi_ut_create_update_state_and_push(object->
	bank_field.
	region_obj,
	action,
	&state_list);
	if (ACPI_FAILURE(status)) {
	goto error_exit;
	}
	break;

	case ACPI_TYPE_LOCAL_INDEX_FIELD:

	next_object = object->index_field.index_obj;
	status =
	acpi_ut_create_update_state_and_push(object->
	index_field.
	data_obj,
	action,
	&state_list);
	if (ACPI_FAILURE(status)) {
	goto error_exit;
	}
	break;

	case ACPI_TYPE_LOCAL_REFERENCE:
	/*
	* The target of an Index (a package, string, or buffer) or a named
	* reference must track changes to the ref count of the index or
	* target object.
	*/
	if ((object->reference.opcode == AML_INDEX_OP) \|\|
	(object->reference.opcode == AML_INT_NAMEPATH_OP)) {
	next_object = object->reference.object;
	}
	break;

	case ACPI_TYPE_REGION:
	default:
	break; /* No subobjects for all other types */
	}

	/*
	* Now we can update the count in the main object. This can only
	* happen after we update the sub-objects in case this causes the
	* main object to be deleted.
	*/
	acpi_ut_update_ref_count(object, action);
	object = NULL;

	/* Move on to the next object to be updated */

	if (next_object) {
	object = next_object;
	next_object = NULL;
	} else if (state_list) {
	state = acpi_ut_pop_generic_state(&state_list);
	object = state->update.object;
	acpi_ut_delete_generic_state(state);
	}
	}

	return_ACPI_STATUS(AE_OK);

	error_exit:

	ACPI_EXCEPTION((AE_INFO, status,
	"Could not update object reference count"));

	return_ACPI_STATUS(status);
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ut_add_reference
	*
	* PARAMETERS: Object - Object whose reference count is to be
	* incremented
	*
	* RETURN: None
	*
	* DESCRIPTION: Add one reference to an ACPI object
	*
	******************************************************************************/

	void acpi_ut_add_reference(union acpi_operand_object *object)
	{

	ACPI_FUNCTION_TRACE_PTR(ut_add_reference, object);

	/* Ensure that we have a valid object */

	if (!acpi_ut_valid_internal_object(object)) {
	return_VOID;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Obj %p Current Refs=%X [To Be Incremented]\n",
	object, object->common.reference_count));

	/* Increment the reference count */

	(void)acpi_ut_update_object_reference(object, REF_INCREMENT);
	return_VOID;
	}

	/*******************************************************************************
	*
	* FUNCTION: acpi_ut_remove_reference
	*
	* PARAMETERS: Object - Object whose ref count will be decremented
	*
	* RETURN: None
	*
	* DESCRIPTION: Decrement the reference count of an ACPI internal object
	*
	******************************************************************************/

	void acpi_ut_remove_reference(union acpi_operand_object *object)
	{

	ACPI_FUNCTION_TRACE_PTR(ut_remove_reference, object);

	/*
	* Allow a NULL pointer to be passed in, just ignore it. This saves
	* each caller from having to check. Also, ignore NS nodes.
	*
	*/
	if (!object \|\|
	(ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) {
	return_VOID;
	}

	/* Ensure that we have a valid object */

	if (!acpi_ut_valid_internal_object(object)) {
	return_VOID;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS,
	"Obj %p Current Refs=%X [To Be Decremented]\n",
	object, object->common.reference_count));

	/*
	* Decrement the reference count, and only actually delete the object
	* if the reference count becomes 0. (Must also decrement the ref count
	* of all subobjects!)
	*/
	(void)acpi_ut_update_object_reference(object, REF_DECREMENT);
	return_VOID;
	}