patch-2.4.6 linux/drivers/acpi/utilities/utdelete.c
Next file: linux/drivers/acpi/utilities/uteval.c
Previous file: linux/drivers/acpi/utilities/utdebug.c
Back to the patch index
Back to the overall index
- Lines: 603
- Date:
Wed Jun 20 17:47:40 2001
- Orig file:
v2.4.5/linux/drivers/acpi/utilities/utdelete.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/utilities/utdelete.c linux/drivers/acpi/utilities/utdelete.c
@@ -0,0 +1,602 @@
+/*******************************************************************************
+ *
+ * Module Name: utdelete - object deletion and reference count utilities
+ * $Revision: 71 $
+ *
+ ******************************************************************************/
+
+/*
+ * 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;
+
+
+ if (!object) {
+ return;
+ }
+
+ /*
+ * 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:
+
+ /* Free the actual string buffer */
+
+ obj_pointer = object->string.pointer;
+ break;
+
+
+ case ACPI_TYPE_BUFFER:
+
+ /* Free the actual buffer */
+
+ obj_pointer = object->buffer.pointer;
+ break;
+
+
+ case ACPI_TYPE_PACKAGE:
+
+ /*
+ * 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_ex_unlink_mutex (object);
+ acpi_os_delete_semaphore (object->mutex.semaphore);
+ break;
+
+
+ case ACPI_TYPE_EVENT:
+
+ acpi_os_delete_semaphore (object->event.semaphore);
+ object->event.semaphore = NULL;
+ break;
+
+
+ case ACPI_TYPE_METHOD:
+
+ /* 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:
+
+ 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:
+
+ 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) {
+ if (!acpi_tb_system_table_pointer (obj_pointer)) {
+ acpi_ut_free (obj_pointer);
+ }
+ }
+
+
+ /* Only delete the object if it was dynamically allocated */
+
+
+ if (!(object->common.flags & AOPOBJ_STATIC_ALLOCATION)) {
+ acpi_ut_delete_object_desc (object);
+ }
+
+ return;
+}
+
+
+/*******************************************************************************
+ *
+ * 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;
+
+
+ /* Walk the null-terminated internal list */
+
+ for (internal_obj = obj_list; *internal_obj; internal_obj++) {
+ /*
+ * Check for a package
+ * Simple objects are simply stored in the array and do not
+ * need to be deleted separately.
+ */
+
+ if (IS_THIS_OBJECT_TYPE ((*internal_obj), ACPI_TYPE_PACKAGE)) {
+ /* Delete the package */
+
+ /*
+ * TBD: [Investigate] This might not be the right thing to do,
+ * depending on how the internal package object was allocated!!!
+ */
+ acpi_ut_delete_internal_obj (*internal_obj);
+ }
+
+ }
+
+ /* Free the combined parameter pointer list and object array */
+
+ acpi_ut_free (obj_list);
+
+ return (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;
+
+ break;
+
+
+ case REF_DECREMENT:
+
+ if (count < 1) {
+ new_count = 0;
+ }
+
+ else {
+ new_count--;
+
+ }
+
+
+ object->common.reference_count = new_count;
+ if (new_count == 0) {
+ acpi_ut_delete_internal_obj (object);
+ }
+
+ break;
+
+
+ case REF_FORCE_DELETE:
+
+ new_count = 0;
+ object->common.reference_count = new_count;
+ acpi_ut_delete_internal_obj (object);
+ break;
+
+
+ default:
+
+ break;
+ }
+
+
+ /*
+ * Sanity check the reference count, for debug purposes only.
+ * (A deleted object will have a huge reference count)
+ */
+
+
+ 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;
+
+
+ /* Ignore a null object ptr */
+
+ if (!object) {
+ return (AE_OK);
+ }
+
+
+ /*
+ * Make sure that this isn't a namespace handle or an AML pointer
+ */
+
+ if (VALID_DESCRIPTOR_TYPE (object, ACPI_DESC_TYPE_NAMED)) {
+ return (AE_OK);
+ }
+
+ if (acpi_tb_system_table_pointer (object)) {
+ return (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 (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 (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 (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 (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 (status);
+ }
+
+ status = acpi_ut_create_update_state_and_push (
+ object->bank_field.region_obj, action, &state_list);
+ if (ACPI_FAILURE (status)) {
+ return (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 (status);
+ }
+
+ status = acpi_ut_create_update_state_and_push (
+ object->index_field.data_obj, action, &state_list);
+ if (ACPI_FAILURE (status)) {
+ return (status);
+ }
+ break;
+
+
+ case ACPI_TYPE_REGION:
+
+ /* TBD: [Investigate]
+ Acpi_ut_update_ref_count (Object->Region.Addr_handler, Action);
+ */
+/*
+ Status =
+ Acpi_ut_create_update_state_and_push (Object->Region.Addr_handler,
+ Action, &State_list);
+ if (ACPI_FAILURE (Status))
+ {
+ return (Status);
+ }
+*/
+ break;
+
+
+ case INTERNAL_TYPE_REFERENCE:
+
+ 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 (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)
+{
+
+
+ /*
+ * Ensure that we have a valid object
+ */
+
+ if (!acpi_ut_valid_internal_object (object)) {
+ return;
+ }
+
+ /*
+ * We have a valid ACPI internal object, now increment the reference count
+ */
+
+ acpi_ut_update_object_reference (object, REF_INCREMENT);
+
+ return;
+}
+
+
+/*******************************************************************************
+ *
+ * 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)
+{
+
+
+ /*
+ * Ensure that we have a valid object
+ */
+
+ if (!acpi_ut_valid_internal_object (object)) {
+ return;
+ }
+
+ /*
+ * 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;
+}
+
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)