utdelete.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:15k
- /*******************************************************************************
- *
- * Module Name: utdelete - object deletion and reference count utilities
- * $Revision: 81 $
- *
- ******************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acinterp.h"
- #include "acnamesp.h"
- #include "actables.h"
- #include "acparser.h"
- #define _COMPONENT ACPI_UTILITIES
- 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 (
- acpi_operand_object *object)
- {
- void *obj_pointer = NULL;
- acpi_operand_object *handler_desc;
- 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 (object->common.type) {
- case ACPI_TYPE_STRING:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** String %p, ptr %pn",
- object, object->string.pointer));
- /* Free the actual string buffer */
- if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) {
- obj_pointer = object->string.pointer;
- }
- break;
- case ACPI_TYPE_BUFFER:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "**** Buffer %p, ptr %pn",
- object, object->buffer.pointer));
- /* Free the actual buffer */
- obj_pointer = object->buffer.pointer;
- break;
- case ACPI_TYPE_PACKAGE:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, " **** Package of count %Xn",
- 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_MUTEX:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Mutex %p, Semaphore %pn",
- object, object->mutex.semaphore));
- acpi_ex_unlink_mutex (object);
- acpi_os_delete_semaphore (object->mutex.semaphore);
- break;
- case ACPI_TYPE_EVENT:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Event %p, Semaphore %pn",
- object, object->event.semaphore));
- acpi_os_delete_semaphore (object->event.semaphore);
- object->event.semaphore = NULL;
- break;
- case ACPI_TYPE_METHOD:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Method %pn", object));
- /* Delete the method semaphore if it exists */
- if (object->method.semaphore) {
- acpi_os_delete_semaphore (object->method.semaphore);
- object->method.semaphore = NULL;
- }
- break;
- case ACPI_TYPE_REGION:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Region %pn", object));
- if (object->region.extra) {
- /*
- * 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.addr_handler;
- if ((handler_desc) &&
- (handler_desc->addr_handler.hflags == ADDR_HANDLER_DEFAULT_INSTALLED)) {
- obj_pointer = object->region.extra->extra.region_context;
- }
- /* Now we can free the Extra object */
- acpi_ut_delete_object_desc (object->region.extra);
- }
- break;
- case ACPI_TYPE_BUFFER_FIELD:
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "***** Buffer Field %pn", object));
- if (object->buffer_field.extra) {
- acpi_ut_delete_object_desc (object->buffer_field.extra);
- }
- break;
- default:
- break;
- }
- /*
- * Delete any allocated memory found above
- */
- if (obj_pointer) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting Obj Ptr %p n", obj_pointer));
- ACPI_MEM_FREE (obj_pointer);
- }
- /* Only delete the object if it was dynamically allocated */
- if (object->common.flags & AOPOBJ_STATIC_ALLOCATION) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Object %p [%s] static allocation, no deleten",
- object, acpi_ut_get_type_name (object->common.type)));
- }
- if (!(object->common.flags & AOPOBJ_STATIC_ALLOCATION)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Deleting object %p [%s]n",
- object, acpi_ut_get_type_name (object->common.type)));
- 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: Status - the status of the call
- *
- * DESCRIPTION: This function deletes an internal object list, including both
- * simple objects and package objects
- *
- ******************************************************************************/
- acpi_status
- acpi_ut_delete_internal_object_list (
- acpi_operand_object **obj_list)
- {
- acpi_operand_object **internal_obj;
- 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_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * 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 (
- acpi_operand_object *object,
- u32 action)
- {
- u16 count;
- u16 new_count;
- PROC_NAME ("Ut_update_ref_count");
- if (!object) {
- return;
- }
- count = object->common.reference_count;
- new_count = count;
- /*
- * 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_INFO, "Obj %p Refs=%X, [Incremented]n",
- object, new_count));
- break;
- case REF_DECREMENT:
- if (count < 1) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "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_INFO, "Obj %p Refs=%X, [Decremented]n",
- object, new_count));
- }
- if (object->common.type == ACPI_TYPE_METHOD) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "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_INFO, "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 > MAX_REFERENCE_COUNT) {
- ACPI_DEBUG_PRINT ((ACPI_DB_WARN,
- "**** Warning **** Large Reference Count (%X) in object %pnn",
- 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 (
- acpi_operand_object *object,
- u16 action)
- {
- acpi_status status;
- u32 i;
- acpi_operand_object *next;
- acpi_operand_object *new;
- acpi_generic_state *state_list = NULL;
- acpi_generic_state *state;
- 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 or an AML pointer
- */
- if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_NAMED)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Object %p is NS handlen", 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 (object->common.type) {
- case ACPI_TYPE_DEVICE:
- status = acpi_ut_create_update_state_and_push (object->device.addr_handler,
- action, &state_list);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- acpi_ut_update_ref_count (object->device.sys_handler, action);
- acpi_ut_update_ref_count (object->device.drv_handler, action);
- break;
- case INTERNAL_TYPE_ADDRESS_HANDLER:
- /* Must walk list of address handlers */
- next = object->addr_handler.next;
- while (next) {
- new = next->addr_handler.next;
- acpi_ut_update_ref_count (next, action);
- next = new;
- }
- 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)) {
- return_ACPI_STATUS (status);
- }
- }
- 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)) {
- return_ACPI_STATUS (status);
- }
- break;
- case INTERNAL_TYPE_REGION_FIELD:
- status = acpi_ut_create_update_state_and_push (
- object->field.region_obj, action, &state_list);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- break;
- case INTERNAL_TYPE_BANK_FIELD:
- status = acpi_ut_create_update_state_and_push (
- object->bank_field.bank_register_obj, action, &state_list);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- status = acpi_ut_create_update_state_and_push (
- object->bank_field.region_obj, action, &state_list);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- break;
- case INTERNAL_TYPE_INDEX_FIELD:
- status = acpi_ut_create_update_state_and_push (
- object->index_field.index_obj, action, &state_list);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- status = acpi_ut_create_update_state_and_push (
- object->index_field.data_obj, action, &state_list);
- if (ACPI_FAILURE (status)) {
- return_ACPI_STATUS (status);
- }
- break;
- case ACPI_TYPE_REGION:
- case INTERNAL_TYPE_REFERENCE:
- /* 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);
- }
- /*******************************************************************************
- *
- * 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 (
- acpi_operand_object *object)
- {
- FUNCTION_TRACE_PTR ("Ut_add_reference", object);
- /*
- * Ensure that we have a valid object
- */
- if (!acpi_ut_valid_internal_object (object)) {
- return_VOID;
- }
- /*
- * We have a valid ACPI internal object, now increment the reference count
- */
- 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 (
- acpi_operand_object *object)
- {
- 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 ||
- (VALID_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_INFO, "Obj %p Refs=%Xn",
- 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!)
- */
- acpi_ut_update_object_reference (object, REF_DECREMENT);
- return_VOID;
- }