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 - 2015, 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 #define EXPORT_ACPI_INTERFACES
  46
  47 #include <acpi/acpi.h>
  48 #include "accommon.h"
  49 #include "acnamesp.h"
  50 #include "acparser.h"
  51 #include "amlcode.h"
  52
  53 #define _COMPONENT          ACPI_NAMESPACE
  54 ACPI_MODULE_NAME("nsxfname")
  55
  56 /* Local prototypes */
  57 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
  58                                     struct acpi_pnp_device_id *source,
  59                                     char *string_area);
  60
  61 /******************************************************************************
  62  *
  63  * FUNCTION:    acpi_get_handle
  64  *
  65  * PARAMETERS:  parent          - Object to search under (search scope).
  66  *              pathname        - Pointer to an asciiz string containing the
  67  *                                name
  68  *              ret_handle      - Where the return handle is returned
  69  *
  70  * RETURN:      Status
  71  *
  72  * DESCRIPTION: This routine will search for a caller specified name in the
  73  *              name space. The caller can restrict the search region by
  74  *              specifying a non NULL parent. The parent value is itself a
  75  *              namespace handle.
  76  *
  77  ******************************************************************************/
  78
  79 acpi_status
  80 acpi_get_handle(acpi_handle parent,
  81                 acpi_string pathname, acpi_handle * ret_handle)
  82 {
  83         acpi_status status;
  84         struct acpi_namespace_node *node = NULL;
  85         struct acpi_namespace_node *prefix_node = NULL;
  86
  87         ACPI_FUNCTION_ENTRY();
  88
  89         /* Parameter Validation */
  90
  91         if (!ret_handle || !pathname) {
  92                 return (AE_BAD_PARAMETER);
  93         }
  94
  95         /* Convert a parent handle to a prefix node */
  96
  97         if (parent) {
  98                 prefix_node = acpi_ns_validate_handle(parent);
  99                 if (!prefix_node) {
 100                         return (AE_BAD_PARAMETER);
 101                 }
 102         }
 103
 104         /*
 105          * Valid cases are:
 106          * 1) Fully qualified pathname
 107          * 2) Parent + Relative pathname
 108          *
 109          * Error for <null Parent + relative path>
 110          */
 111         if (ACPI_IS_ROOT_PREFIX(pathname[0])) {
 112
 113                 /* Pathname is fully qualified (starts with '\') */
 114
 115                 /* Special case for root-only, since we can't search for it */
 116
 117                 if (!strcmp(pathname, ACPI_NS_ROOT_PATH)) {
 118                         *ret_handle =
 119                             ACPI_CAST_PTR(acpi_handle, acpi_gbl_root_node);
 120                         return (AE_OK);
 121                 }
 122         } else if (!prefix_node) {
 123
 124                 /* Relative path with null prefix is disallowed */
 125
 126                 return (AE_BAD_PARAMETER);
 127         }
 128
 129         /* Find the Node and convert to a handle */
 130
 131         status =
 132             acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
 133         if (ACPI_SUCCESS(status)) {
 134                 *ret_handle = ACPI_CAST_PTR(acpi_handle, node);
 135         }
 136
 137         return (status);
 138 }
 139
 140 ACPI_EXPORT_SYMBOL(acpi_get_handle)
 141
 142 /******************************************************************************
 143  *
 144  * FUNCTION:    acpi_get_name
 145  *
 146  * PARAMETERS:  handle          - Handle to be converted to a pathname
 147  *              name_type       - Full pathname or single segment
 148  *              buffer          - Buffer for returned path
 149  *
 150  * RETURN:      Pointer to a string containing the fully qualified Name.
 151  *
 152  * DESCRIPTION: This routine returns the fully qualified name associated with
 153  *              the Handle parameter. This and the acpi_pathname_to_handle are
 154  *              complementary functions.
 155  *
 156  ******************************************************************************/
 157 acpi_status
 158 acpi_get_name(acpi_handle handle, u32 name_type, struct acpi_buffer * buffer)
 159 {
 160         acpi_status status;
 161         struct acpi_namespace_node *node;
 162         const char *node_name;
 163
 164         /* Parameter validation */
 165
 166         if (name_type > ACPI_NAME_TYPE_MAX) {
 167                 return (AE_BAD_PARAMETER);
 168         }
 169
 170         status = acpi_ut_validate_buffer(buffer);
 171         if (ACPI_FAILURE(status)) {
 172                 return (status);
 173         }
 174
 175         if (name_type == ACPI_FULL_PATHNAME ||
 176             name_type == ACPI_FULL_PATHNAME_NO_TRAILING) {
 177
 178                 /* Get the full pathname (From the namespace root) */
 179
 180                 status = acpi_ns_handle_to_pathname(handle, buffer,
 181                                                     name_type ==
 182                                                     ACPI_FULL_PATHNAME ? FALSE :
 183                                                     TRUE);
 184                 return (status);
 185         }
 186
 187         /*
 188          * Wants the single segment ACPI name.
 189          * Validate handle and convert to a namespace Node
 190          */
 191         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 192         if (ACPI_FAILURE(status)) {
 193                 return (status);
 194         }
 195
 196         node = acpi_ns_validate_handle(handle);
 197         if (!node) {
 198                 status = AE_BAD_PARAMETER;
 199                 goto unlock_and_exit;
 200         }
 201
 202         /* Validate/Allocate/Clear caller buffer */
 203
 204         status = acpi_ut_initialize_buffer(buffer, ACPI_PATH_SEGMENT_LENGTH);
 205         if (ACPI_FAILURE(status)) {
 206                 goto unlock_and_exit;
 207         }
 208
 209         /* Just copy the ACPI name from the Node and zero terminate it */
 210
 211         node_name = acpi_ut_get_node_name(node);
 212         ACPI_MOVE_NAME(buffer->pointer, node_name);
 213         ((char *)buffer->pointer)[ACPI_NAME_SIZE] = 0;
 214         status = AE_OK;
 215
 216 unlock_and_exit:
 217
 218         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 219         return (status);
 220 }
 221
 222 ACPI_EXPORT_SYMBOL(acpi_get_name)
 223
 224 /******************************************************************************
 225  *
 226  * FUNCTION:    acpi_ns_copy_device_id
 227  *
 228  * PARAMETERS:  dest                - Pointer to the destination PNP_DEVICE_ID
 229  *              source              - Pointer to the source PNP_DEVICE_ID
 230  *              string_area         - Pointer to where to copy the dest string
 231  *
 232  * RETURN:      Pointer to the next string area
 233  *
 234  * DESCRIPTION: Copy a single PNP_DEVICE_ID, including the string data.
 235  *
 236  ******************************************************************************/
 237 static char *acpi_ns_copy_device_id(struct acpi_pnp_device_id *dest,
 238                                     struct acpi_pnp_device_id *source,
 239                                     char *string_area)
 240 {
 241         /* Create the destination PNP_DEVICE_ID */
 242
 243         dest->string = string_area;
 244         dest->length = source->length;
 245
 246         /* Copy actual string and return a pointer to the next string area */
 247
 248         memcpy(string_area, source->string, source->length);
 249         return (string_area + source->length);
 250 }
 251
 252 /******************************************************************************
 253  *
 254  * FUNCTION:    acpi_get_object_info
 255  *
 256  * PARAMETERS:  handle              - Object Handle
 257  *              return_buffer       - Where the info is returned
 258  *
 259  * RETURN:      Status
 260  *
 261  * DESCRIPTION: Returns information about an object as gleaned from the
 262  *              namespace node and possibly by running several standard
 263  *              control methods (Such as in the case of a device.)
 264  *
 265  * For Device and Processor objects, run the Device _HID, _UID, _CID, _STA,
 266  * _CLS, _ADR, _sx_w, and _sx_d methods.
 267  *
 268  * Note: Allocates the return buffer, must be freed by the caller.
 269  *
 270  * Note: This interface is intended to be used during the initial device
 271  * discovery namespace traversal. Therefore, no complex methods can be
 272  * executed, especially those that access operation regions. Therefore, do
 273  * not add any additional methods that could cause problems in this area.
 274  * this was the fate of the _SUB method which was found to cause such
 275  * problems and was removed (11/2015).
 276  *
 277  ******************************************************************************/
 278
 279 acpi_status
 280 acpi_get_object_info(acpi_handle handle,
 281                      struct acpi_device_info **return_buffer)
 282 {
 283         struct acpi_namespace_node *node;
 284         struct acpi_device_info *info;
 285         struct acpi_pnp_device_id_list *cid_list = NULL;
 286         struct acpi_pnp_device_id *hid = NULL;
 287         struct acpi_pnp_device_id *uid = NULL;
 288         struct acpi_pnp_device_id *cls = NULL;
 289         char *next_id_string;
 290         acpi_object_type type;
 291         acpi_name name;
 292         u8 param_count = 0;
 293         u16 valid = 0;
 294         u32 info_size;
 295         u32 i;
 296         acpi_status status;
 297
 298         /* Parameter validation */
 299
 300         if (!handle || !return_buffer) {
 301                 return (AE_BAD_PARAMETER);
 302         }
 303
 304         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 305         if (ACPI_FAILURE(status)) {
 306                 return (status);
 307         }
 308
 309         node = acpi_ns_validate_handle(handle);
 310         if (!node) {
 311                 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 312                 return (AE_BAD_PARAMETER);
 313         }
 314
 315         /* Get the namespace node data while the namespace is locked */
 316
 317         info_size = sizeof(struct acpi_device_info);
 318         type = node->type;
 319         name = node->name.integer;
 320
 321         if (node->type == ACPI_TYPE_METHOD) {
 322                 param_count = node->object->method.param_count;
 323         }
 324
 325         status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 326         if (ACPI_FAILURE(status)) {
 327                 return (status);
 328         }
 329
 330         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 331                 /*
 332                  * Get extra info for ACPI Device/Processor objects only:
 333                  * Run the Device _HID, _UID, _CLS, and _CID methods.
 334                  *
 335                  * Note: none of these methods are required, so they may or may
 336                  * not be present for this device. The Info->Valid bitfield is used
 337                  * to indicate which methods were found and run successfully.
 338                  */
 339
 340                 /* Execute the Device._HID method */
 341
 342                 status = acpi_ut_execute_HID(node, &hid);
 343                 if (ACPI_SUCCESS(status)) {
 344                         info_size += hid->length;
 345                         valid |= ACPI_VALID_HID;
 346                 }
 347
 348                 /* Execute the Device._UID method */
 349
 350                 status = acpi_ut_execute_UID(node, &uid);
 351                 if (ACPI_SUCCESS(status)) {
 352                         info_size += uid->length;
 353                         valid |= ACPI_VALID_UID;
 354                 }
 355
 356                 /* Execute the Device._CID method */
 357
 358                 status = acpi_ut_execute_CID(node, &cid_list);
 359                 if (ACPI_SUCCESS(status)) {
 360
 361                         /* Add size of CID strings and CID pointer array */
 362
 363                         info_size +=
 364                             (cid_list->list_size -
 365                              sizeof(struct acpi_pnp_device_id_list));
 366                         valid |= ACPI_VALID_CID;
 367                 }
 368
 369                 /* Execute the Device._CLS method */
 370
 371                 status = acpi_ut_execute_CLS(node, &cls);
 372                 if (ACPI_SUCCESS(status)) {
 373                         info_size += cls->length;
 374                         valid |= ACPI_VALID_CLS;
 375                 }
 376         }
 377
 378         /*
 379          * Now that we have the variable-length data, we can allocate the
 380          * return buffer
 381          */
 382         info = ACPI_ALLOCATE_ZEROED(info_size);
 383         if (!info) {
 384                 status = AE_NO_MEMORY;
 385                 goto cleanup;
 386         }
 387
 388         /* Get the fixed-length data */
 389
 390         if ((type == ACPI_TYPE_DEVICE) || (type == ACPI_TYPE_PROCESSOR)) {
 391                 /*
 392                  * Get extra info for ACPI Device/Processor objects only:
 393                  * Run the _STA, _ADR and, sx_w, and _sx_d methods.
 394                  *
 395                  * Notes: none of these methods are required, so they may or may
 396                  * not be present for this device. The Info->Valid bitfield is used
 397                  * to indicate which methods were found and run successfully.
 398                  *
 399                  * For _STA, if the method does not exist, then (as per the ACPI
 400                  * specification), the returned current_status flags will indicate
 401                  * that the device is present/functional/enabled. Otherwise, the
 402                  * current_status flags reflect the value returned from _STA.
 403                  */
 404
 405                 /* Execute the Device._STA method */
 406
 407                 status = acpi_ut_execute_STA(node, &info->current_status);
 408                 if (ACPI_SUCCESS(status)) {
 409                         valid |= ACPI_VALID_STA;
 410                 }
 411
 412                 /* Execute the Device._ADR method */
 413
 414                 status = acpi_ut_evaluate_numeric_object(METHOD_NAME__ADR, node,
 415                                                          &info->address);
 416                 if (ACPI_SUCCESS(status)) {
 417                         valid |= ACPI_VALID_ADR;
 418                 }
 419
 420                 /* Execute the Device._sx_w methods */
 421
 422                 status = acpi_ut_execute_power_methods(node,
 423                                                        acpi_gbl_lowest_dstate_names,
 424                                                        ACPI_NUM_sx_w_METHODS,
 425                                                        info->lowest_dstates);
 426                 if (ACPI_SUCCESS(status)) {
 427                         valid |= ACPI_VALID_SXWS;
 428                 }
 429
 430                 /* Execute the Device._sx_d methods */
 431
 432                 status = acpi_ut_execute_power_methods(node,
 433                                                        acpi_gbl_highest_dstate_names,
 434                                                        ACPI_NUM_sx_d_METHODS,
 435                                                        info->highest_dstates);
 436                 if (ACPI_SUCCESS(status)) {
 437                         valid |= ACPI_VALID_SXDS;
 438                 }
 439         }
 440
 441         /*
 442          * Create a pointer to the string area of the return buffer.
 443          * Point to the end of the base struct acpi_device_info structure.
 444          */
 445         next_id_string = ACPI_CAST_PTR(char, info->compatible_id_list.ids);
 446         if (cid_list) {
 447
 448                 /* Point past the CID PNP_DEVICE_ID array */
 449
 450                 next_id_string +=
 451                     ((acpi_size) cid_list->count *
 452                      sizeof(struct acpi_pnp_device_id));
 453         }
 454
 455         /*
 456          * Copy the HID, UID, and CIDs to the return buffer. The variable-length
 457          * strings are copied to the reserved area at the end of the buffer.
 458          *
 459          * For HID and CID, check if the ID is a PCI Root Bridge.
 460          */
 461         if (hid) {
 462                 next_id_string = acpi_ns_copy_device_id(&info->hardware_id,
 463                                                         hid, next_id_string);
 464
 465                 if (acpi_ut_is_pci_root_bridge(hid->string)) {
 466                         info->flags |= ACPI_PCI_ROOT_BRIDGE;
 467                 }
 468         }
 469
 470         if (uid) {
 471                 next_id_string = acpi_ns_copy_device_id(&info->unique_id,
 472                                                         uid, next_id_string);
 473         }
 474
 475         if (cid_list) {
 476                 info->compatible_id_list.count = cid_list->count;
 477                 info->compatible_id_list.list_size = cid_list->list_size;
 478
 479                 /* Copy each CID */
 480
 481                 for (i = 0; i < cid_list->count; i++) {
 482                         next_id_string =
 483                             acpi_ns_copy_device_id(&info->compatible_id_list.
 484                                                    ids[i], &cid_list->ids[i],
 485                                                    next_id_string);
 486
 487                         if (acpi_ut_is_pci_root_bridge(cid_list->ids[i].string)) {
 488                                 info->flags |= ACPI_PCI_ROOT_BRIDGE;
 489                         }
 490                 }
 491         }
 492
 493         if (cls) {
 494                 next_id_string = acpi_ns_copy_device_id(&info->class_code,
 495                                                         cls, next_id_string);
 496         }
 497
 498         /* Copy the fixed-length data */
 499
 500         info->info_size = info_size;
 501         info->type = type;
 502         info->name = name;
 503         info->param_count = param_count;
 504         info->valid = valid;
 505
 506         *return_buffer = info;
 507         status = AE_OK;
 508
 509 cleanup:
 510         if (hid) {
 511                 ACPI_FREE(hid);
 512         }
 513         if (uid) {
 514                 ACPI_FREE(uid);
 515         }
 516         if (cid_list) {
 517                 ACPI_FREE(cid_list);
 518         }
 519         if (cls) {
 520                 ACPI_FREE(cls);
 521         }
 522         return (status);
 523 }
 524
 525 ACPI_EXPORT_SYMBOL(acpi_get_object_info)
 526
 527 /******************************************************************************
 528  *
 529  * FUNCTION:    acpi_install_method
 530  *
 531  * PARAMETERS:  buffer         - An ACPI table containing one control method
 532  *
 533  * RETURN:      Status
 534  *
 535  * DESCRIPTION: Install a control method into the namespace. If the method
 536  *              name already exists in the namespace, it is overwritten. The
 537  *              input buffer must contain a valid DSDT or SSDT containing a
 538  *              single control method.
 539  *
 540  ******************************************************************************/
 541 acpi_status acpi_install_method(u8 *buffer)
 542 {
 543         struct acpi_table_header *table =
 544             ACPI_CAST_PTR(struct acpi_table_header, buffer);
 545         u8 *aml_buffer;
 546         u8 *aml_start;
 547         char *path;
 548         struct acpi_namespace_node *node;
 549         union acpi_operand_object *method_obj;
 550         struct acpi_parse_state parser_state;
 551         u32 aml_length;
 552         u16 opcode;
 553         u8 method_flags;
 554         acpi_status status;
 555
 556         /* Parameter validation */
 557
 558         if (!buffer) {
 559                 return (AE_BAD_PARAMETER);
 560         }
 561
 562         /* Table must be a DSDT or SSDT */
 563
 564         if (!ACPI_COMPARE_NAME(table->signature, ACPI_SIG_DSDT) &&
 565             !ACPI_COMPARE_NAME(table->signature, ACPI_SIG_SSDT)) {
 566                 return (AE_BAD_HEADER);
 567         }
 568
 569         /* First AML opcode in the table must be a control method */
 570
 571         parser_state.aml = buffer + sizeof(struct acpi_table_header);
 572         opcode = acpi_ps_peek_opcode(&parser_state);
 573         if (opcode != AML_METHOD_OP) {
 574                 return (AE_BAD_PARAMETER);
 575         }
 576
 577         /* Extract method information from the raw AML */
 578
 579         parser_state.aml += acpi_ps_get_opcode_size(opcode);
 580         parser_state.pkg_end = acpi_ps_get_next_package_end(&parser_state);
 581         path = acpi_ps_get_next_namestring(&parser_state);
 582
 583         method_flags = *parser_state.aml++;
 584         aml_start = parser_state.aml;
 585         aml_length = ACPI_PTR_DIFF(parser_state.pkg_end, aml_start);
 586
 587         /*
 588          * Allocate resources up-front. We don't want to have to delete a new
 589          * node from the namespace if we cannot allocate memory.
 590          */
 591         aml_buffer = ACPI_ALLOCATE(aml_length);
 592         if (!aml_buffer) {
 593                 return (AE_NO_MEMORY);
 594         }
 595
 596         method_obj = acpi_ut_create_internal_object(ACPI_TYPE_METHOD);
 597         if (!method_obj) {
 598                 ACPI_FREE(aml_buffer);
 599                 return (AE_NO_MEMORY);
 600         }
 601
 602         /* Lock namespace for acpi_ns_lookup, we may be creating a new node */
 603
 604         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
 605         if (ACPI_FAILURE(status)) {
 606                 goto error_exit;
 607         }
 608
 609         /* The lookup either returns an existing node or creates a new one */
 610
 611         status =
 612             acpi_ns_lookup(NULL, path, ACPI_TYPE_METHOD, ACPI_IMODE_LOAD_PASS1,
 613                            ACPI_NS_DONT_OPEN_SCOPE | ACPI_NS_ERROR_IF_FOUND,
 614                            NULL, &node);
 615
 616         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
 617
 618         if (ACPI_FAILURE(status)) {     /* ns_lookup */
 619                 if (status != AE_ALREADY_EXISTS) {
 620                         goto error_exit;
 621                 }
 622
 623                 /* Node existed previously, make sure it is a method node */
 624
 625                 if (node->type != ACPI_TYPE_METHOD) {
 626                         status = AE_TYPE;
 627                         goto error_exit;
 628                 }
 629         }
 630
 631         /* Copy the method AML to the local buffer */
 632
 633         memcpy(aml_buffer, aml_start, aml_length);
 634
 635         /* Initialize the method object with the new method's information */
 636
 637         method_obj->method.aml_start = aml_buffer;
 638         method_obj->method.aml_length = aml_length;
 639
 640         method_obj->method.param_count = (u8)
 641             (method_flags & AML_METHOD_ARG_COUNT);
 642
 643         if (method_flags & AML_METHOD_SERIALIZED) {
 644                 method_obj->method.info_flags = ACPI_METHOD_SERIALIZED;
 645
 646                 method_obj->method.sync_level = (u8)
 647                     ((method_flags & AML_METHOD_SYNC_LEVEL) >> 4);
 648         }
 649
 650         /*
 651          * Now that it is complete, we can attach the new method object to
 652          * the method Node (detaches/deletes any existing object)
 653          */
 654         status = acpi_ns_attach_object(node, method_obj, ACPI_TYPE_METHOD);
 655
 656         /*
 657          * Flag indicates AML buffer is dynamic, must be deleted later.
 658          * Must be set only after attach above.
 659          */
 660         node->flags |= ANOBJ_ALLOCATED_BUFFER;
 661
 662         /* Remove local reference to the method object */
 663
 664         acpi_ut_remove_reference(method_obj);
 665         return (status);
 666
 667 error_exit:
 668
 669         ACPI_FREE(aml_buffer);
 670         ACPI_FREE(method_obj);
 671         return (status);
 672 }
 673 ACPI_EXPORT_SYMBOL(acpi_install_method)