drivers/acpi/acpica/nsxfname.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsxfname - Public interfaces to the ACPI subsystem
   4  *                         ACPI Namespace oriented interfaces
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2013, Intel Corp.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include <linux/export.h>
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "acparser.h"
  50 #include "amlcode.h"
  51
  52 #define _COMPONENT          ACPI_NAMESPACE
  53 ACPI_MODULE_NAME("nsxfname")
  54
  55 /* Local prototypes */
  56 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
  57                                     struct acpi_pnp_device_id *source,
  58                                     char *string_area);
  59
  60 /******************************************************************************
  61  *
  62  * FUNCTION:    acpi_get_handle
  63  *
  64  * PARAMETERS:  parent          - Object to search under (search scope).
  65  *              pathname        - Pointer to an asciiz string containing the
  66  *                                name
  67  *              ret_handle      - Where the return handle is returned
  68  *
  69  * RETURN:      Status
  70  *
  71  * DESCRIPTION: This routine will search for a caller specified name in the
  72  *              name space. The caller can restrict the search region by
  73  *              specifying a non NULL parent. The parent value is itself a
  74  *              namespace handle.
  75  *
  76  ******************************************************************************/
  77
  78 acpi_status
  79 acpi_get_handle(acpi_handle parent,
  80                 acpi_string pathname, acpi_handle * ret_handle)
  81 {
  82         acpi_status status;
  83         struct acpi_namespace_node *node = NULL;
  84         struct acpi_namespace_node *prefix_node = NULL;
  85
  86         ACPI_FUNCTION_ENTRY();
  87
  88         /* Parameter Validation */
  89
  90         if (!ret_handle || !pathname) {
  91                 return (AE_BAD_PARAMETER);
  92         }
  93
  94         /* Convert a parent handle to a prefix node */
  95
  96         if (parent) {
  97                 prefix_node = acpi_ns_validate_handle(parent);
  98                 if (!prefix_node) {
  99                         return (AE_BAD_PARAMETER);
 100                 }
 101         }
 102
 103         /*
 104          * Valid cases are:
 105          * 1) Fully qualified pathname
 106          * 2) Parent + Relative pathname
 107          *
 108          * Error for <null Parent + relative path>
 109          */
 110         if (ACPI_IS_ROOT_PREFIX(pathname[0])) {
 111
 112                 /* Pathname is fully qualified (starts with '\') */
 113
 114                 /* Special case for root-only, since we can't search for it */
 115
 116                 if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
 117                         *ret_handle =
 118                             ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
 119                         return (AE_OK);
 120                 }
 121         } else if (!prefix_node) {
 122
 123                 /* Relative path with null prefix is disallowed */
 124
 125                 return (AE_BAD_PARAMETER);
 126         }
 127
 128         /* Find the Node and convert to a handle */
 129
 130         status =
 131             acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 132         if (ACPI_SUCCESS(status)) {
 133                 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 134         }
 135
 136         return (status);
 137 }
 138
 139 ACPI_EXPORT_SYMBOL(acpi_get_handle)
 140
 141 /******************************************************************************
 142  *
 143  * FUNCTION:    acpi_get_name
 144  *
 145  * PARAMETERS:  handle          - Handle to be converted to a pathname
 146  *              name_type       - Full pathname or single segment
 147  *              buffer          - Buffer for returned path
 148  *
 149  * RETURN:      Pointer to a string containing the fully qualified Name.
 150  *
 151  * DESCRIPTION: This routine returns the fully qualified name associated with
 152  *              the Handle parameter. This and the acpi_pathname_to_handle are
 153  *              complementary functions.
 154  *
 155  ******************************************************************************/
 156 acpi_status
 157 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 158 {
 159         acpi_status status;
 160         struct acpi_namespace_node *node;
 161         char *node_name;
 162
 163         /* Parameter validation */
 164
 165         if (name_type > ACPI_NAME_TYPE_MAX) {
 166                 return (AE_BAD_PARAMETER);
 167         }
 168
 169         status = acpi_ut_validate_buffer(buffer);
 170         if (ACPI_FAILURE(status)) {
 171                 return (status);
 172         }
 173
 174         if (name_type == ACPI_FULL_PATHNAME) {
 175
 176                 /* Get the full pathname (From the namespace root) */
 177
 178                 status = acpi_ns_handle_to_pathname(handle, buffer);
 179                 return (status);
 180         }
 181
 182         /*
 183          * Wants the single segment ACPI name.
 184          * Validate handle and convert to a namespace Node
 185          */
 186         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 187         if (ACPI_FAILURE(status)) {
 188                 return (status);
 189         }
 190
 191         node = acpi_ns_validate_handle(handle);
 192         if (!node) {
 193                 status = AE_BAD_PARAMETER;
 194                 goto unlock_and_exit;
 195         }
 196
 197         /* Validate/Allocate/Clear caller buffer */
 198
 199         status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
 200         if (ACPI_FAILURE(status)) {
 201                 goto unlock_and_exit;
 202         }
 203
 204         /* Just copy the ACPI name from the Node and zero terminate it */
 205
 206         node_name = acpi_ut_get_node_name(node);
 207         ACPI_MOVE_NAME(buffer->pointer, node_name);
 208         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 209         status = AE_OK;
 210
 211       unlock_and_exit:
 212
 213         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 214         return (status);
 215 }
 216
 217 ACPI_EXPORT_SYMBOL(acpi_get_name)
 218
 219 /******************************************************************************
 220  *
 221  * FUNCTION:    acpi_ns_copy_device_id
 222  *
 223  * PARAMETERS:  dest                - Pointer to the destination PNP_DEVICE_ID
 224  *              source              - Pointer to the source PNP_DEVICE_ID
 225  *              string_area         - Pointer to where to copy the dest string
 226  *
 227  * RETURN:      Pointer to the next string area
 228  *
 229  * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
 230  *
 231  ******************************************************************************/
 232 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
 233                                     struct acpi_pnp_device_id *source,
 234                                     char *string_area)
 235 {
 236
 237         /* Create the destination PNP_DEVICE_ID */
 238
 239         dest->string = string_area;
 240         dest->length = source->length;
 241
 242         /* Copy actual string and return a pointer to the next string area */
 243
 244         ACPI_MEMCPY(string_area, source->string, source->length);
 245         return (string_area + source->length);
 246 }
 247
 248 /******************************************************************************
 249  *
 250  * FUNCTION:    acpi_get_object_info
 251  *
 252  * PARAMETERS:  handle              - Object Handle
 253  *              return_buffer       - Where the info is returned
 254  *
 255  * RETURN:      Status
 256  *
 257  * DESCRIPTION: Returns information about an object as gleaned from the
 258  *              namespace node and possibly by running several standard
 259  *              control methods (Such as in the case of a device.)
 260  *
 261  * For Device and Processor objects, run the Device _HID, _UID, _CID, _SUB,
 262  * _STA, _ADR, _sx_w, and _sx_d methods.
 263  *
 264  * Note: Allocates the return buffer, must be freed by the caller.
 265  *
 266  ******************************************************************************/
 267
 268 acpi_status
 269 acpi_get_object_info(acpi_handle handle,
 270                      struct acpi_device_info **return_buffer)
 271 {
 272         struct acpi_namespace_node *node;
 273         struct acpi_device_info *info;
 274         struct acpi_pnp_device_id_list *cid_list = NULL;
 275         struct acpi_pnp_device_id *hid = NULL;
 276         struct acpi_pnp_device_id *uid = NULL;
 277         struct acpi_pnp_device_id *sub = NULL;
 278         char *next_id_string;
 279         acpi_object_type type;
 280         acpi_name name;
 281         u8 param_count = 0;
 282         u8 valid = 0;
 283         u32 info_size;
 284         u32 i;
 285         acpi_status status;
 286
 287         /* Parameter validation */
 288
 289         if (!handle || !return_buffer) {
 290                 return (AE_BAD_PARAMETER);
 291         }
 292
 293         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 294         if (ACPI_FAILURE(status)) {
 295                 return (status);
 296         }
 297
 298         node = acpi_ns_validate_handle(handle);
 299         if (!node) {
 300                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 301                 return (AE_BAD_PARAMETER);
 302         }
 303
 304         /* Get the namespace node data while the namespace is locked */
 305
 306         info_size = sizeof(struct acpi_device_info);
 307         type = node->type;
 308         name = node->name.integer;
 309
 310         if (node->type == ACPI_TYPE_METHOD) {
 311                 param_count = node->object->method.param_count;
 312         }
 313
 314         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 315         if (ACPI_FAILURE(status)) {
 316                 return (status);
 317         }
 318
 319         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 320                 /*
 321                  * Get extra info for ACPI Device/Processor objects only:
 322                  * Run the Device _HID, _UID, _SUB, and _CID methods.
 323                  *
 324                  * Note: none of these methods are required, so they may or may
 325                  * not be present for this device. The Info->Valid bitfield is used
 326                  * to indicate which methods were found and run successfully.
 327                  */
 328
 329                 /* Execute the Device._HID method */
 330
 331                 status = acpi_ut_execute_HID(node, &hid);
 332                 if (ACPI_SUCCESS(status)) {
 333                         info_size += hid->length;
 334                         valid |= ACPI_VALID_HID;
 335                 }
 336
 337                 /* Execute the Device._UID method */
 338
 339                 status = acpi_ut_execute_UID(node, &uid);
 340                 if (ACPI_SUCCESS(status)) {
 341                         info_size += uid->length;
 342                         valid |= ACPI_VALID_UID;
 343                 }
 344
 345                 /* Execute the Device._SUB method */
 346
 347                 status = acpi_ut_execute_SUB(node, &sub);
 348                 if (ACPI_SUCCESS(status)) {
 349                         info_size += sub->length;
 350                         valid |= ACPI_VALID_SUB;
 351                 }
 352
 353                 /* Execute the Device._CID method */
 354
 355                 status = acpi_ut_execute_CID(node, &cid_list);
 356                 if (ACPI_SUCCESS(status)) {
 357
 358                         /* Add size of CID strings and CID pointer array */
 359
 360                         info_size +=
 361                             (cid_list->list_size -
 362                              sizeof(struct acpi_pnp_device_id_list));
 363                         valid |= ACPI_VALID_CID;
 364                 }
 365         }
 366
 367         /*
 368          * Now that we have the variable-length data, we can allocate the
 369          * return buffer
 370          */
 371         info = ACPI_ALLOCATE_ZEROED(info_size);
 372         if (!info) {
 373                 status = AE_NO_MEMORY;
 374                 goto cleanup;
 375         }
 376
 377         /* Get the fixed-length data */
 378
 379         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 380                 /*
 381                  * Get extra info for ACPI Device/Processor objects only:
 382                  * Run the _STA, _ADR and, sx_w, and _sx_d methods.
 383                  *
 384                  * Notes: none of these methods are required, so they may or may
 385                  * not be present for this device. The Info->Valid bitfield is used
 386                  * to indicate which methods were found and run successfully.
 387                  *
 388                  * For _STA, if the method does not exist, then (as per the ACPI
 389                  * specification), the returned current_status flags will indicate
 390                  * that the device is present/functional/enabled. Otherwise, the
 391                  * current_status flags reflect the value returned from _STA.
 392                  */
 393
 394                 /* Execute the Device._STA method */
 395
 396                 status = acpi_ut_execute_STA(node, &info->current_status);
 397                 if (ACPI_SUCCESS(status)) {
 398                         valid |= ACPI_VALID_STA;
 399                 }
 400
 401                 /* Execute the Device._ADR method */
 402
 403                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 404                                                          &info->address);
 405                 if (ACPI_SUCCESS(status)) {
 406                         valid |= ACPI_VALID_ADR;
 407                 }
 408
 409                 /* Execute the Device._sx_w methods */
 410
 411                 status = acpi_ut_execute_power_methods(node,
 412                                                        acpi_gbl_lowest_dstate_names,
 413                                                        ACPI_NUM_sx_w_METHODS,
 414                                                        info->lowest_dstates);
 415                 if (ACPI_SUCCESS(status)) {
 416                         valid |= ACPI_VALID_SXWS;
 417                 }
 418
 419                 /* Execute the Device._sx_d methods */
 420
 421                 status = acpi_ut_execute_power_methods(node,
 422                                                        acpi_gbl_highest_dstate_names,
 423                                                        ACPI_NUM_sx_d_METHODS,
 424                                                        info->highest_dstates);
 425                 if (ACPI_SUCCESS(status)) {
 426                         valid |= ACPI_VALID_SXDS;
 427                 }
 428         }
 429
 430         /*
 431          * Create a pointer to the string area of the return buffer.
 432          * Point to the end of the base struct acpi_device_info structure.
 433          */
 434         next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
 435         if (cid_list) {
 436
 437                 /* Point past the CID PNP_DEVICE_ID array */
 438
 439                 next_id_string +=
 440                     ((acpi_size) cid_list->count *
 441                      sizeof(struct acpi_pnp_device_id));
 442         }
 443
 444         /*
 445          * Copy the HID, UID, SUB, and CIDs to the return buffer.
 446          * The variable-length strings are copied to the reserved area
 447          * at the end of the buffer.
 448          *
 449          * For HID and CID, check if the ID is a PCI Root Bridge.
 450          */
 451         if (hid) {
 452                 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
 453                                                         hid, next_id_string);
 454
 455                 if (acpi_ut_is_pci_root_bridge(hid->string)) {
 456                         info->flags |= ACPI_PCI_ROOT_BRIDGE;
 457                 }
 458         }
 459
 460         if (uid) {
 461                 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
 462                                                         uid, next_id_string);
 463         }
 464
 465         if (sub) {
 466                 next_id_string = acpi_ns_copy_device_id(&info->subsystem_id,
 467                                                         sub, next_id_string);
 468         }
 469
 470         if (cid_list) {
 471                 info->compatible_id_list.count = cid_list->count;
 472                 info->compatible_id_list.list_size = cid_list->list_size;
 473
 474                 /* Copy each CID */
 475
 476                 for (i = 0; i < cid_list->count; i++) {
 477                         next_id_string =
 478                             acpi_ns_copy_device_id(&info->compatible_id_list.
 479                                                    ids[i], &cid_list->ids[i],
 480                                                    next_id_string);
 481
 482                         if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
 483                                 info->flags |= ACPI_PCI_ROOT_BRIDGE;
 484                         }
 485                 }
 486         }
 487
 488         /* Copy the fixed-length data */
 489
 490         info->info_size = info_size;
 491         info->type = type;
 492         info->name = name;
 493         info->param_count = param_count;
 494         info->valid = valid;
 495
 496         *return_buffer = info;
 497         status = AE_OK;
 498
 499       cleanup:
 500         if (hid) {
 501                 ACPI_FREE(hid);
 502         }
 503         if (uid) {
 504                 ACPI_FREE(uid);
 505         }
 506         if (sub) {
 507                 ACPI_FREE(sub);
 508         }
 509         if (cid_list) {
 510                 ACPI_FREE(cid_list);
 511         }
 512         return (status);
 513 }
 514
 515 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
 516
 517 /******************************************************************************
 518  *
 519  * FUNCTION:    acpi_install_method
 520  *
 521  * PARAMETERS:  buffer         - An ACPI table containing one control method
 522  *
 523  * RETURN:      Status
 524  *
 525  * DESCRIPTION: Install a control method into the namespace. If the method
 526  *              name already exists in the namespace, it is overwritten. The
 527  *              input buffer must contain a valid DSDT or SSDT containing a
 528  *              single control method.
 529  *
 530  ******************************************************************************/
 531 acpi_status acpi_install_method(u8 *buffer)
 532 {
 533         struct acpi_table_header *table =
 534             ACPI_CAST_PTR(struct acpi_table_header, buffer);
 535         u8 *aml_buffer;
 536         u8 *aml_start;
 537         char *path;
 538         struct acpi_namespace_node *node;
 539         union acpi_operand_object *method_obj;
 540         struct acpi_parse_state parser_state;
 541         u32 aml_length;
 542         u16 opcode;
 543         u8 method_flags;
 544         acpi_status status;
 545
 546         /* Parameter validation */
 547
 548         if (!buffer) {
 549                 return (AE_BAD_PARAMETER);
 550         }
 551
 552         /* Table must be a DSDT or SSDT */
 553
 554         if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
 555             !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 556                 return (AE_BAD_HEADER);
 557         }
 558
 559         /* First AML opcode in the table must be a control method */
 560
 561         parser_state.aml = buffer + sizeof(struct acpi_table_header);
 562         opcode = acpi_ps_peek_opcode(&parser_state);
 563         if (opcode != AML_METHOD_OP) {
 564                 return (AE_BAD_PARAMETER);
 565         }
 566
 567         /* Extract method information from the raw AML */
 568
 569         parser_state.aml += acpi_ps_get_opcode_size(opcode);
 570         parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
 571         path = acpi_ps_get_next_namestring(&parser_state);
 572         method_flags = *parser_state.aml++;
 573         aml_start = parser_state.aml;
 574         aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
 575
 576         /*
 577          * Allocate resources up-front. We don't want to have to delete a new
 578          * node from the namespace if we cannot allocate memory.
 579          */
 580         aml_buffer = ACPI_ALLOCATE(aml_length);
 581         if (!aml_buffer) {
 582                 return (AE_NO_MEMORY);
 583         }
 584
 585         method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 586         if (!method_obj) {
 587                 ACPI_FREE(aml_buffer);
 588                 return (AE_NO_MEMORY);
 589         }
 590
 591         /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
 592
 593         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 594         if (ACPI_FAILURE(status)) {
 595                 goto error_exit;
 596         }
 597
 598         /* The lookup either returns an existing node or creates a new one */
 599
 600         status =
 601             acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
 602                            ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
 603                            NULL, &node);
 604
 605         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 606
 607         if (ACPI_FAILURE(status)) {     /* ns_lookup */
 608                 if (status != AE_ALREADY_EXISTS) {
 609                         goto error_exit;
 610                 }
 611
 612                 /* Node existed previously, make sure it is a method node */
 613
 614                 if (node->type != ACPI_TYPE_METHOD) {
 615                         status = AE_TYPE;
 616                         goto error_exit;
 617                 }
 618         }
 619
 620         /* Copy the method AML to the local buffer */
 621
 622         ACPI_MEMCPY(aml_buffer, aml_start, aml_length);
 623
 624         /* Initialize the method object with the new method's information */
 625
 626         method_obj->method.aml_start = aml_buffer;
 627         method_obj->method.aml_length = aml_length;
 628
 629         method_obj->method.param_count = (u8)
 630             (method_flags & AML_METHOD_ARG_COUNT);
 631
 632         if (method_flags & AML_METHOD_SERIALIZED) {
 633                 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
 634
 635                 method_obj->method.sync_level = (u8)
 636                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 637         }
 638
 639         /*
 640          * Now that it is complete, we can attach the new method object to
 641          * the method Node (detaches/deletes any existing object)
 642          */
 643         status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
 644
 645         /*
 646          * Flag indicates AML buffer is dynamic, must be deleted later.
 647          * Must be set only after attach above.
 648          */
 649         node->flags |= ANOBJ_ALLOCATED_BUFFER;
 650
 651         /* Remove local reference to the method object */
 652
 653         acpi_ut_remove_reference(method_obj);
 654         return (status);
 655
 656 error_exit:
 657
 658         ACPI_FREE(aml_buffer);
 659         ACPI_FREE(method_obj);
 660         return (status);
 661 }
 662 ACPI_EXPORT_SYMBOL(acpi_install_method)