1 files changed, 700 insertions, 0 deletions

diff --git a/drivers/acpi/utilities/utdelete.c b/drivers/acpi/utilities/utdelete.c
new file mode 100644
index 000000000000..9a52ad52a23a
--- /dev/null
+++ b/drivers/acpi/utilities/utdelete.c
@@ -0,0 +1,700 @@
+/*******************************************************************************
+ *
+ * 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;
+}
+
+