patch-2.4.0-test3 linux/drivers/acpi/common/cmdelete.c

• Lines: 585
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/common/cmdelete.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/common/cmdelete.c linux/drivers/acpi/common/cmdelete.c
@@ -0,0 +1,584 @@
+
+/******************************************************************************
+ *
+ * Module Name: cmdelete - object deletion and reference count utilities
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 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 "interp.h"
+#include "namesp.h"
+#include "tables.h"
+#include "parser.h"
+
+#define _COMPONENT          MISCELLANEOUS
+	 MODULE_NAME         ("cmdelete");
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_cm_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_cm_delete_internal_obj (
+	ACPI_OBJECT_INTERNAL    *object)
+{
+	void                    *obj_pointer = NULL;
+
+
+	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_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 parse tree if it exists */
+
+		if (object->method.parser_op) {
+			acpi_ps_delete_parse_tree (object->method.parser_op);
+			object->method.parser_op = NULL;
+		}
+
+		/* Delete semaphore if it exists */
+
+		if (object->method.semaphore) {
+			acpi_os_delete_semaphore (object->method.semaphore);
+			object->method.semaphore = NULL;
+		}
+
+		break;
+
+
+	default:
+		break;
+	}
+
+
+	/*
+	 * Delete any allocated memory found above
+	 */
+
+	if (obj_pointer) {
+		if (!acpi_tb_system_table_pointer (obj_pointer)) {
+			acpi_cm_free (obj_pointer);
+		}
+	}
+
+
+	/* Only delete the object if it was dynamically allocated */
+
+
+	if (!(object->common.flags & AO_STATIC_ALLOCATION)) {
+		acpi_cm_delete_object_desc (object);
+
+	}
+
+	return;
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_cm_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_cm_delete_internal_object_list (
+	ACPI_OBJECT_INTERNAL    **obj_list)
+{
+	ACPI_OBJECT_INTERNAL    **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_cm_delete_internal_obj (*internal_obj);
+		}
+
+	}
+
+	/* Free the combined parameter pointer list and object array */
+
+	acpi_cm_free (obj_list);
+
+	return (AE_OK);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_cm_update_ref_count
+ *
+ * PARAMETERS:  *Object         - Object whose ref count is to be updated
+ *              Count           - Current ref count
+ *              Action          - What to do
+ *
+ * RETURN:      New ref count
+ *
+ * DESCRIPTION: Modify the ref count and return it.
+ *
+ ******************************************************************************/
+
+void
+acpi_cm_update_ref_count (
+	ACPI_OBJECT_INTERNAL    *object,
+	s32                     action)
+{
+	u16                     count;
+	u16                     new_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_cm_delete_internal_obj (object);
+		}
+
+		break;
+
+
+	case REF_FORCE_DELETE:
+
+		new_count = 0;
+		object->common.reference_count = new_count;
+		acpi_cm_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_cm_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 added as a value in an Name Table Entry (NTE)
+ * 2) An object is copied (all subobjects must be incremented)
+ *
+ * Object references are decremented when:
+ * 1) An object is removed from an NTE
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_cm_update_object_reference (
+	ACPI_OBJECT_INTERNAL    *object,
+	u16                     action)
+{
+	ACPI_STATUS             status;
+	u32                     i;
+	ACPI_OBJECT_INTERNAL    *next;
+	ACPI_OBJECT_INTERNAL    *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_cm_create_update_state (object, action);
+
+	while (state) {
+
+		object = state->update.object;
+		action = state->update.value;
+		acpi_cm_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_cm_create_update_state_and_push (object->device.addr_handler,
+					   action, &state_list);
+			if (ACPI_FAILURE (status)) {
+				return (status);
+			}
+
+			acpi_cm_update_ref_count (object->device.sys_handler, action);
+			acpi_cm_update_ref_count (object->device.drv_handler, action);
+			break;
+
+
+		case INTERNAL_TYPE_ADDRESS_HANDLER:
+
+			/* Must walk list of address handlers */
+
+			next = object->addr_handler.link;
+			while (next) {
+				new = next->addr_handler.link;
+				acpi_cm_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_cm_create_update_state_and_push (object->package.elements[i],
+							   action, &state_list);
+				if (ACPI_FAILURE (status)) {
+					return (status);
+				}
+			}
+			break;
+
+
+		case ACPI_TYPE_FIELD_UNIT:
+
+			status =
+				acpi_cm_create_update_state_and_push (object->field_unit.container,
+						   action, &state_list);
+			if (ACPI_FAILURE (status)) {
+				return (status);
+			}
+			break;
+
+
+		case INTERNAL_TYPE_DEF_FIELD:
+
+			status =
+				acpi_cm_create_update_state_and_push (object->field.container,
+						   action, &state_list);
+			if (ACPI_FAILURE (status)) {
+				return (status);
+			}
+		   break;
+
+
+		case INTERNAL_TYPE_BANK_FIELD:
+
+			status =
+				acpi_cm_create_update_state_and_push (object->bank_field.bank_select,
+						   action, &state_list);
+			if (ACPI_FAILURE (status)) {
+				return (status);
+			}
+
+			status =
+				acpi_cm_create_update_state_and_push (object->bank_field.container,
+						   action, &state_list);
+			if (ACPI_FAILURE (status)) {
+				return (status);
+			}
+			break;
+
+
+		case ACPI_TYPE_REGION:
+
+			acpi_cm_update_ref_count (object->region.method, action);
+
+	/* TBD: [Investigate]
+			Acpi_cm_update_ref_count (Object->Region.Addr_handler, Action);
+	*/
+/*
+			Status =
+				Acpi_cm_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_cm_update_ref_count (object, action);
+
+
+		/* Move on to the next object to be updated */
+
+		state = acpi_cm_pop_generic_state (&state_list);
+	}
+
+
+	return (AE_OK);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_cm_add_reference
+ *
+ * PARAMETERS:  *Object        - Object whose reference count is to be
+ *                                  incremented
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Add one reference to an ACPI object
+ *
+ ******************************************************************************/
+
+void
+acpi_cm_add_reference (
+	ACPI_OBJECT_INTERNAL    *object)
+{
+
+
+	/*
+	 * Ensure that we have a valid object
+	 */
+
+	if (!acpi_cm_valid_internal_object (object)) {
+		return;
+	}
+
+
+	/*
+	 * We have a valid ACPI internal object, now increment the reference count
+	 */
+
+	acpi_cm_update_object_reference (object, REF_INCREMENT);
+
+	return;
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_cm_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_cm_remove_reference (
+	ACPI_OBJECT_INTERNAL    *object)
+{
+
+
+	/*
+	 * Ensure that we have a valid object
+	 */
+
+	if (!acpi_cm_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_cm_update_object_reference (object, REF_DECREMENT);
+
+	/*
+	 * If the reference count has reached zero,
+	 * delete the object and all sub-objects contained within it
+	 */
+/*
+	if (Object->Common.Reference_count == 0) {
+		Acpi_cm_delete_internal_obj (Object);
+	}
+*/
+	return;
+}
+
+