[net-next-2.6.git] / drivers / acpi / utilities / utdelete.c

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

/*
 * Copyright (C) 2000 - 2005, R. Byron Moore
 * 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")


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

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, Semaphore %p\n",
			object, object->mutex.semaphore));

		acpi_ex_unlink_mutex (object);
		(void) acpi_os_delete_semaphore (object->mutex.semaphore);
		break;


	case ACPI_TYPE_EVENT:

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

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


	case ACPI_TYPE_METHOD:

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

		/* Delete the method semaphore if it exists */

		if (object->method.semaphore) {
			(void) acpi_os_delete_semaphore (object->method.semaphore);
			object->method.semaphore = 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.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
					obj_pointer = 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;


	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_MEM_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_MEM_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, or 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_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown action (%X)\n", 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_DEBUG_PRINT ((ACPI_DB_WARN,
			"**** Warning **** Large Reference Count (%X) in object %p\n\n",
			count, object));
	}

	return;
}


/*******************************************************************************
 *
 * 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;
	u32                             i;
	union acpi_generic_state         *state_list = NULL;
	union acpi_generic_state         *state;
	union acpi_operand_object        *tmp;

	ACPI_FUNCTION_TRACE_PTR ("ut_update_object_reference", object);


	/* Ignore a null object ptr */

	if (!object) {
		return_ACPI_STATUS (AE_OK);
	}

	/* 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);
	}

	state = acpi_ut_create_update_state (object, action);

	while (state) {
		object = state->update.object;
		action = state->update.value;
		acpi_ut_delete_generic_state (state);

		/*
		 * 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:

			tmp = object->device.system_notify;
			if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
				object->device.system_notify = NULL;
			acpi_ut_update_ref_count (tmp, action);

			tmp = object->device.device_notify;
			if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
				object->device.device_notify = NULL;
			acpi_ut_update_ref_count (tmp, 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, etc.
			 */
			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;
				}

				tmp = object->package.elements[i];
				if (tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
					object->package.elements[i] = NULL;
			}
			break;


		case ACPI_TYPE_BUFFER_FIELD:

			status = acpi_ut_create_update_state_and_push (
					 object->buffer_field.buffer_obj, action, &state_list);
			if (ACPI_FAILURE (status)) {
				goto error_exit;
			}

			tmp = object->buffer_field.buffer_obj;
			if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
				object->buffer_field.buffer_obj = NULL;
			break;


		case ACPI_TYPE_LOCAL_REGION_FIELD:

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

			tmp = object->field.region_obj;
			if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
				object->field.region_obj = NULL;
		   break;


		case ACPI_TYPE_LOCAL_BANK_FIELD:

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

			tmp = object->bank_field.bank_obj;
			if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
				object->bank_field.bank_obj = NULL;

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

			tmp = object->bank_field.region_obj;
			if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
				object->bank_field.region_obj = NULL;
			break;


		case ACPI_TYPE_LOCAL_INDEX_FIELD:

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

			tmp = object->index_field.index_obj;
			if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
				object->index_field.index_obj = NULL;

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

			tmp = object->index_field.data_obj;
			if ( tmp && (tmp->common.reference_count <= 1)  && action == REF_DECREMENT)
				object->index_field.data_obj = NULL;
			break;


		case ACPI_TYPE_LOCAL_REFERENCE:

			/*
			 * The target of an Index (a package, string, or buffer) must track
			 * changes to the ref count of the index.
			 */
			if (object->reference.opcode == AML_INDEX_OP) {
				status = acpi_ut_create_update_state_and_push (
						 object->reference.object, action, &state_list);
				if (ACPI_FAILURE (status)) {
					goto error_exit;
				}
			}
			break;


		case ACPI_TYPE_REGION:
		default:

			/* No subobjects */
			break;
		}

		/*
		 * 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);

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

		state = acpi_ut_pop_generic_state (&state_list);
	}

	return_ACPI_STATUS (AE_OK);


error_exit:

	ACPI_REPORT_ERROR (("Could not update object reference count, %s\n",
		acpi_format_exception (status)));

	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;
}
Commit	Line	Data
1da177e4 LT	1	/*******************************************************************************
	2	*
	3	* Module Name: utdelete - object deletion and reference count utilities
	4	*
	5	******************************************************************************/
	6
	7	/*
	8	* Copyright (C) 2000 - 2005, R. Byron Moore
	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
	44
	45	#include <acpi/acpi.h>
	46	#include <acpi/acinterp.h>
	47	#include <acpi/acnamesp.h>
	48	#include <acpi/acevents.h>
	49	#include <acpi/amlcode.h>
	50
	51	#define _COMPONENT ACPI_UTILITIES
	52	ACPI_MODULE_NAME ("utdelete")
	53
	54
	55	/*******************************************************************************
	56	*
	57	* FUNCTION: acpi_ut_delete_internal_obj
	58	*
	59	* PARAMETERS: *Object - Pointer to the list to be deleted
	60	*
	61	* RETURN: None
	62	*
	63	* DESCRIPTION: Low level object deletion, after reference counts have been
	64	* updated (All reference counts, including sub-objects!)
65	*
66	******************************************************************************/
67
68	void
69	acpi_ut_delete_internal_obj (
70	union acpi_operand_object *object)
71	{
72	void *obj_pointer = NULL;
73	union acpi_operand_object *handler_desc;
74	union acpi_operand_object *second_desc;
75	union acpi_operand_object *next_desc;
76
77
78	ACPI_FUNCTION_TRACE_PTR ("ut_delete_internal_obj", object);
79
80
81	if (!object) {
82	return_VOID;
83	}
84
85	/*
86	* Must delete or free any pointers within the object that are not
87	* actual ACPI objects (for example, a raw buffer pointer).
88	*/
89	switch (ACPI_GET_OBJECT_TYPE (object)) {
90	case ACPI_TYPE_STRING:
91
92	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** String %p, ptr %p\n",
93	object, object->string.pointer));
94
95	/* Free the actual string buffer */
96
97	if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
98	/* But only if it is NOT a pointer into an ACPI table */
99
100	obj_pointer = object->string.pointer;
101	}
102	break;
103
104
105	case ACPI_TYPE_BUFFER:
106
107	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "**** Buffer %p, ptr %p\n",
108	object, object->buffer.pointer));
109
110	/* Free the actual buffer */
111
112	if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
113	/* But only if it is NOT a pointer into an ACPI table */
114
115	obj_pointer = object->buffer.pointer;
116	}
117	break;
118
119
120	case ACPI_TYPE_PACKAGE:
121
122	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, " **** Package of count %X\n",
123	object->package.count));
124
125	/*
126	* Elements of the package are not handled here, they are deleted
127	* separately
128	*/
129
130	/* Free the (variable length) element pointer array */
131
132	obj_pointer = object->package.elements;
133	break;
134
135
136	case ACPI_TYPE_DEVICE:
137
138	if (object->device.gpe_block) {
139	(void) acpi_ev_delete_gpe_block (object->device.gpe_block);
140	}
141
142	/* Walk the handler list for this device */
143
144	handler_desc = object->device.handler;
145	while (handler_desc) {
146	next_desc = handler_desc->address_space.next;
147	acpi_ut_remove_reference (handler_desc);
148	handler_desc = next_desc;
149	}
150	break;
151
152
153	case ACPI_TYPE_MUTEX:
154
155	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Mutex %p, Semaphore %p\n",
156	object, object->mutex.semaphore));
157
158	acpi_ex_unlink_mutex (object);
159	(void) acpi_os_delete_semaphore (object->mutex.semaphore);
160	break;
161
162
163	case ACPI_TYPE_EVENT:
164
165	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Event %p, Semaphore %p\n",
166	object, object->event.semaphore));
167
168	(void) acpi_os_delete_semaphore (object->event.semaphore);
169	object->event.semaphore = NULL;
170	break;
171
172
173	case ACPI_TYPE_METHOD:
174
175	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Method %p\n", object));
176
177	/* Delete the method semaphore if it exists */
178
179	if (object->method.semaphore) {
180	(void) acpi_os_delete_semaphore (object->method.semaphore);
181	object->method.semaphore = NULL;
182	}
183	break;
184
185
186	case ACPI_TYPE_REGION:
187
188	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Region %p\n", object));
189
190	second_desc = acpi_ns_get_secondary_object (object);
191	if (second_desc) {
192	/*
193	* Free the region_context if and only if the handler is one of the
194	* default handlers -- and therefore, we created the context object
195	* locally, it was not created by an external caller.
196	*/
197	handler_desc = object->region.handler;
198	if (handler_desc) {
199	if (handler_desc->address_space.hflags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {
200	obj_pointer = second_desc->extra.region_context;
201	}
202
203	acpi_ut_remove_reference (handler_desc);
204	}
205
206	/* Now we can free the Extra object */
207
208	acpi_ut_delete_object_desc (second_desc);
209	}
210	break;
211
212
213	case ACPI_TYPE_BUFFER_FIELD:
214
215	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "***** Buffer Field %p\n", object));
216
217	second_desc = acpi_ns_get_secondary_object (object);
218	if (second_desc) {
219	acpi_ut_delete_object_desc (second_desc);
220	}
221	break;
222
223
224	default:
225	break;
226	}
227
228	/* Free any allocated memory (pointer within the object) found above */
229
230	if (obj_pointer) {
231	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object Subptr %p\n",
232	obj_pointer));
233	ACPI_MEM_FREE (obj_pointer);
234	}
235
236	/* Now the object can be safely deleted */
237
238	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n",
239	object, acpi_ut_get_object_type_name (object)));
240
241	acpi_ut_delete_object_desc (object);
242	return_VOID;
243	}
244
245
246	/*******************************************************************************
247	*
248	* FUNCTION: acpi_ut_delete_internal_object_list
249	*
250	* PARAMETERS: *obj_list - Pointer to the list to be deleted
251	*
252	* RETURN: None
253	*
254	* DESCRIPTION: This function deletes an internal object list, including both
255	* simple objects and package objects
256	*
257	******************************************************************************/
258
259	void
260	acpi_ut_delete_internal_object_list (
261	union acpi_operand_object **obj_list)
262	{
263	union acpi_operand_object **internal_obj;
264
265
266	ACPI_FUNCTION_TRACE ("ut_delete_internal_object_list");
267
268
269	/* Walk the null-terminated internal list */
270
271	for (internal_obj = obj_list; *internal_obj; internal_obj++) {
272	acpi_ut_remove_reference (*internal_obj);
273	}
274
275	/* Free the combined parameter pointer list and object array */
276
277	ACPI_MEM_FREE (obj_list);
278	return_VOID;
279	}
280
281
282	/*******************************************************************************
283	*
284	* FUNCTION: acpi_ut_update_ref_count
285	*
286	* PARAMETERS: *Object - Object whose ref count is to be updated
287	* Action - What to do
288	*
289	* RETURN: New ref count
290	*
291	* DESCRIPTION: Modify the ref count and return it.
292	*
293	******************************************************************************/
294
295	static void
296	acpi_ut_update_ref_count (
297	union acpi_operand_object *object,
298	u32 action)
299	{
300	u16 count;
301	u16 new_count;
302
303
304	ACPI_FUNCTION_NAME ("ut_update_ref_count");
305
306
307	if (!object) {
308	return;
309	}
310
311	count = object->common.reference_count;
312	new_count = count;
313
314	/*
315	* Perform the reference count action (increment, decrement, or force delete)
316	*/
317	switch (action) {
318
319	case REF_INCREMENT:
320
321	new_count++;
322	object->common.reference_count = new_count;
323
324	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, [Incremented]\n",
325	object, new_count));
326	break;
327
328
329	case REF_DECREMENT:
330
331	if (count < 1) {
332	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, can't decrement! (Set to 0)\n",
333	object, new_count));
334
335	new_count = 0;
336	}
337	else {
338	new_count--;
339
340	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, [Decremented]\n",
341	object, new_count));
342	}
343
344	if (ACPI_GET_OBJECT_TYPE (object) == ACPI_TYPE_METHOD) {
345	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Method Obj %p Refs=%X, [Decremented]\n",
346	object, new_count));
347	}
348
349	object->common.reference_count = new_count;
350	if (new_count == 0) {
351	acpi_ut_delete_internal_obj (object);
352	}
353
354	break;
355
356
357	case REF_FORCE_DELETE:
358
359	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Obj %p Refs=%X, Force delete! (Set to 0)\n",
360	object, count));
361
362	new_count = 0;
363	object->common.reference_count = new_count;
364	acpi_ut_delete_internal_obj (object);
365	break;
366
367
368	default:
369
370	ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown action (%X)\n", action));
371	break;
372	}
373
374	/*
375	* Sanity check the reference count, for debug purposes only.
376	* (A deleted object will have a huge reference count)
377	*/
378	if (count > ACPI_MAX_REFERENCE_COUNT) {
379
380	ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
381	"** Warning ** Large Reference Count (%X) in object %p\n\n",
382	count, object));
383	}
384
385	return;
386	}
387
388
389	/*******************************************************************************
390	*
391	* FUNCTION: acpi_ut_update_object_reference
392	*
393	* PARAMETERS: *Object - Increment ref count for this object
394	* and all sub-objects
395	* Action - Either REF_INCREMENT or REF_DECREMENT or
396	* REF_FORCE_DELETE
397	*
398	* RETURN: Status
399	*
400	* DESCRIPTION: Increment the object reference count
401	*
402	* Object references are incremented when:
403	* 1) An object is attached to a Node (namespace object)
404	* 2) An object is copied (all subobjects must be incremented)
405	*
406	* Object references are decremented when:
407	* 1) An object is detached from an Node
408	*
409	******************************************************************************/
410
411	acpi_status
412	acpi_ut_update_object_reference (
413	union acpi_operand_object *object,
414	u16 action)
415	{
416	acpi_status status;
417	u32 i;
418	union acpi_generic_state *state_list = NULL;
419	union acpi_generic_state *state;
420	union acpi_operand_object *tmp;
421
422	ACPI_FUNCTION_TRACE_PTR ("ut_update_object_reference", object);
423
424
425	/* Ignore a null object ptr */
426
427	if (!object) {
428	return_ACPI_STATUS (AE_OK);
429	}
430
431	/* Make sure that this isn't a namespace handle */
432
433	if (ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED) {
434	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Object %p is NS handle\n", object));
435	return_ACPI_STATUS (AE_OK);
436	}
437
438	state = acpi_ut_create_update_state (object, action);
439
440	while (state) {
441	object = state->update.object;
442	action = state->update.value;
443	acpi_ut_delete_generic_state (state);
444
445	/*
446	* All sub-objects must have their reference count incremented also.
447	* Different object types have different subobjects.
448	*/
449	switch (ACPI_GET_OBJECT_TYPE (object)) {
450	case ACPI_TYPE_DEVICE:
451
452	tmp = object->device.system_notify;
453	if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
454	object->device.system_notify = NULL;
455	acpi_ut_update_ref_count (tmp, action);
456
457	tmp = object->device.device_notify;
458	if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
459	object->device.device_notify = NULL;
460	acpi_ut_update_ref_count (tmp, action);
461
462	break;
463
464
465	case ACPI_TYPE_PACKAGE:
466
467	/*
468	* We must update all the sub-objects of the package
469	* (Each of whom may have their own sub-objects, etc.
470	*/
471	for (i = 0; i < object->package.count; i++) {
472	/*
473	* Push each element onto the stack for later processing.
474	* Note: There can be null elements within the package,
475	* these are simply ignored
476	*/
477	status = acpi_ut_create_update_state_and_push (
478	object->package.elements[i], action, &state_list);
479	if (ACPI_FAILURE (status)) {
480	goto error_exit;
481	}
482
483	tmp = object->package.elements[i];
484	if (tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
485	object->package.elements[i] = NULL;
486	}
487	break;
488
489
490	case ACPI_TYPE_BUFFER_FIELD:
491
492	status = acpi_ut_create_update_state_and_push (
493	object->buffer_field.buffer_obj, action, &state_list);
494	if (ACPI_FAILURE (status)) {
495	goto error_exit;
496	}
497
498	tmp = object->buffer_field.buffer_obj;
499	if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
500	object->buffer_field.buffer_obj = NULL;
501	break;
502
503
504	case ACPI_TYPE_LOCAL_REGION_FIELD:
505
506	status = acpi_ut_create_update_state_and_push (
507	object->field.region_obj, action, &state_list);
508	if (ACPI_FAILURE (status)) {
509	goto error_exit;
510	}
511
512	tmp = object->field.region_obj;
513	if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
514	object->field.region_obj = NULL;
515	break;
516
517
518	case ACPI_TYPE_LOCAL_BANK_FIELD:
519
520	status = acpi_ut_create_update_state_and_push (
521	object->bank_field.bank_obj, action, &state_list);
522	if (ACPI_FAILURE (status)) {
523	goto error_exit;
524	}
525
526	tmp = object->bank_field.bank_obj;
527	if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
528	object->bank_field.bank_obj = NULL;
529
530	status = acpi_ut_create_update_state_and_push (
531	object->bank_field.region_obj, action, &state_list);
532	if (ACPI_FAILURE (status)) {
533	goto error_exit;
534	}
535
536	tmp = object->bank_field.region_obj;
537	if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
538	object->bank_field.region_obj = NULL;
539	break;
540
541
542	case ACPI_TYPE_LOCAL_INDEX_FIELD:
543
544	status = acpi_ut_create_update_state_and_push (
545	object->index_field.index_obj, action, &state_list);
546	if (ACPI_FAILURE (status)) {
547	goto error_exit;
548	}
549
550	tmp = object->index_field.index_obj;
551	if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
552	object->index_field.index_obj = NULL;
553
554	status = acpi_ut_create_update_state_and_push (
555	object->index_field.data_obj, action, &state_list);
556	if (ACPI_FAILURE (status)) {
557	goto error_exit;
558	}
559
560	tmp = object->index_field.data_obj;
561	if ( tmp && (tmp->common.reference_count <= 1) && action == REF_DECREMENT)
562	object->index_field.data_obj = NULL;
563	break;
564
565
566	case ACPI_TYPE_LOCAL_REFERENCE:
567
568	/*
569	* The target of an Index (a package, string, or buffer) must track
570	* changes to the ref count of the index.
571	*/
572	if (object->reference.opcode == AML_INDEX_OP) {
573	status = acpi_ut_create_update_state_and_push (
574	object->reference.object, action, &state_list);
575	if (ACPI_FAILURE (status)) {
576	goto error_exit;
577	}
578	}
579	break;
580
581
582	case ACPI_TYPE_REGION:
583	default:
584
585	/* No subobjects */
586	break;
587	}
588
589	/*
590	* Now we can update the count in the main object. This can only
591	* happen after we update the sub-objects in case this causes the
592	* main object to be deleted.
593	*/
594	acpi_ut_update_ref_count (object, action);
595
596	/* Move on to the next object to be updated */
597
598	state = acpi_ut_pop_generic_state (&state_list);
599	}
600
601	return_ACPI_STATUS (AE_OK);
602
603
604	error_exit:
605
606	ACPI_REPORT_ERROR (("Could not update object reference count, %s\n",
607	acpi_format_exception (status)));
608
609	return_ACPI_STATUS (status);
610	}
611
612
613	/*******************************************************************************
614	*
615	* FUNCTION: acpi_ut_add_reference
616	*
617	* PARAMETERS: *Object - Object whose reference count is to be
618	* incremented
619	*
620	* RETURN: None
621	*
622	* DESCRIPTION: Add one reference to an ACPI object
623	*
624	******************************************************************************/
625
626	void
627	acpi_ut_add_reference (
628	union acpi_operand_object *object)
629	{
630
631	ACPI_FUNCTION_TRACE_PTR ("ut_add_reference", object);
632
633
634	/* Ensure that we have a valid object */
635
636	if (!acpi_ut_valid_internal_object (object)) {
637	return_VOID;
638	}
639
640	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
641	"Obj %p Current Refs=%X [To Be Incremented]\n",
642	object, object->common.reference_count));
643
644	/* Increment the reference count */
645
646	(void) acpi_ut_update_object_reference (object, REF_INCREMENT);
647	return_VOID;
648	}
649
650
651	/*******************************************************************************
652	*
653	* FUNCTION: acpi_ut_remove_reference
654	*
655	* PARAMETERS: *Object - Object whose ref count will be decremented
656	*
657	* RETURN: None
658	*
659	* DESCRIPTION: Decrement the reference count of an ACPI internal object
660	*
661	******************************************************************************/
662
663	void
664	acpi_ut_remove_reference (
665	union acpi_operand_object *object)
666	{
667
668	ACPI_FUNCTION_TRACE_PTR ("ut_remove_reference", object);
669
670
671	/*
672	* Allow a NULL pointer to be passed in, just ignore it. This saves
673	* each caller from having to check. Also, ignore NS nodes.
674	*
675	*/
676	if (!object \|\|
677	(ACPI_GET_DESCRIPTOR_TYPE (object) == ACPI_DESC_TYPE_NAMED)) {
678	return_VOID;
679	}
680
681	/* Ensure that we have a valid object */
682
683	if (!acpi_ut_valid_internal_object (object)) {
684	return_VOID;
685	}
686
687	ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS,
688	"Obj %p Current Refs=%X [To Be Decremented]\n",
689	object, object->common.reference_count));
690
691	/*
692	* Decrement the reference count, and only actually delete the object
693	* if the reference count becomes 0. (Must also decrement the ref count
694	* of all subobjects!)
695	*/
696	(void) acpi_ut_update_object_reference (object, REF_DECREMENT);
697	return_VOID;
698	}
699
700