nsalloc.c revision 129684
1/******************************************************************************* 2 * 3 * Module Name: nsalloc - Namespace allocation and deletion utilities 4 * $Revision: 87 $ 5 * 6 ******************************************************************************/ 7 8/****************************************************************************** 9 * 10 * 1. Copyright Notice 11 * 12 * Some or all of this work - Copyright (c) 1999 - 2004, Intel Corp. 13 * All rights reserved. 14 * 15 * 2. License 16 * 17 * 2.1. This is your license from Intel Corp. under its intellectual property 18 * rights. You may have additional license terms from the party that provided 19 * you this software, covering your right to use that party's intellectual 20 * property rights. 21 * 22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 23 * copy of the source code appearing in this file ("Covered Code") an 24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 25 * base code distributed originally by Intel ("Original Intel Code") to copy, 26 * make derivatives, distribute, use and display any portion of the Covered 27 * Code in any form, with the right to sublicense such rights; and 28 * 29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 30 * license (with the right to sublicense), under only those claims of Intel 31 * patents that are infringed by the Original Intel Code, to make, use, sell, 32 * offer to sell, and import the Covered Code and derivative works thereof 33 * solely to the minimum extent necessary to exercise the above copyright 34 * license, and in no event shall the patent license extend to any additions 35 * to or modifications of the Original Intel Code. No other license or right 36 * is granted directly or by implication, estoppel or otherwise; 37 * 38 * The above copyright and patent license is granted only if the following 39 * conditions are met: 40 * 41 * 3. Conditions 42 * 43 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 44 * Redistribution of source code of any substantial portion of the Covered 45 * Code or modification with rights to further distribute source must include 46 * the above Copyright Notice, the above License, this list of Conditions, 47 * and the following Disclaimer and Export Compliance provision. In addition, 48 * Licensee must cause all Covered Code to which Licensee contributes to 49 * contain a file documenting the changes Licensee made to create that Covered 50 * Code and the date of any change. Licensee must include in that file the 51 * documentation of any changes made by any predecessor Licensee. Licensee 52 * must include a prominent statement that the modification is derived, 53 * directly or indirectly, from Original Intel Code. 54 * 55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 56 * Redistribution of source code of any substantial portion of the Covered 57 * Code or modification without rights to further distribute source must 58 * include the following Disclaimer and Export Compliance provision in the 59 * documentation and/or other materials provided with distribution. In 60 * addition, Licensee may not authorize further sublicense of source of any 61 * portion of the Covered Code, and must include terms to the effect that the 62 * license from Licensee to its licensee is limited to the intellectual 63 * property embodied in the software Licensee provides to its licensee, and 64 * not to intellectual property embodied in modifications its licensee may 65 * make. 66 * 67 * 3.3. Redistribution of Executable. Redistribution in executable form of any 68 * substantial portion of the Covered Code or modification must reproduce the 69 * above Copyright Notice, and the following Disclaimer and Export Compliance 70 * provision in the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3.4. Intel retains all right, title, and interest in and to the Original 74 * Intel Code. 75 * 76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 77 * Intel shall be used in advertising or otherwise to promote the sale, use or 78 * other dealings in products derived from or relating to the Covered Code 79 * without prior written authorization from Intel. 80 * 81 * 4. Disclaimer and Export Compliance 82 * 83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 89 * PARTICULAR PURPOSE. 90 * 91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 98 * LIMITED REMEDY. 99 * 100 * 4.3. Licensee shall not export, either directly or indirectly, any of this 101 * software or system incorporating such software without first obtaining any 102 * required license or other approval from the U. S. Department of Commerce or 103 * any other agency or department of the United States Government. In the 104 * event Licensee exports any such software from the United States or 105 * re-exports any such software from a foreign destination, Licensee shall 106 * ensure that the distribution and export/re-export of the software is in 107 * compliance with all laws, regulations, orders, or other restrictions of the 108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 109 * any of its subsidiaries will export/re-export any technical data, process, 110 * software, or service, directly or indirectly, to any country for which the 111 * United States government or any agency thereof requires an export license, 112 * other governmental approval, or letter of assurance, without first obtaining 113 * such license, approval or letter. 114 * 115 *****************************************************************************/ 116 117 118#define __NSALLOC_C__ 119 120#include "acpi.h" 121#include "acnamesp.h" 122 123 124#define _COMPONENT ACPI_NAMESPACE 125 ACPI_MODULE_NAME ("nsalloc") 126 127 128/******************************************************************************* 129 * 130 * FUNCTION: AcpiNsCreateNode 131 * 132 * PARAMETERS: AcpiName - Name of the new node 133 * 134 * RETURN: None 135 * 136 * DESCRIPTION: Create a namespace node 137 * 138 ******************************************************************************/ 139 140ACPI_NAMESPACE_NODE * 141AcpiNsCreateNode ( 142 UINT32 Name) 143{ 144 ACPI_NAMESPACE_NODE *Node; 145 146 147 ACPI_FUNCTION_TRACE ("NsCreateNode"); 148 149 150 Node = ACPI_MEM_CALLOCATE (sizeof (ACPI_NAMESPACE_NODE)); 151 if (!Node) 152 { 153 return_PTR (NULL); 154 } 155 156 ACPI_MEM_TRACKING (AcpiGbl_MemoryLists[ACPI_MEM_LIST_NSNODE].TotalAllocated++); 157 158 Node->Name.Integer = Name; 159 Node->ReferenceCount = 1; 160 ACPI_SET_DESCRIPTOR_TYPE (Node, ACPI_DESC_TYPE_NAMED); 161 162 return_PTR (Node); 163} 164 165 166/******************************************************************************* 167 * 168 * FUNCTION: AcpiNsDeleteNode 169 * 170 * PARAMETERS: Node - Node to be deleted 171 * 172 * RETURN: None 173 * 174 * DESCRIPTION: Delete a namespace node 175 * 176 ******************************************************************************/ 177 178void 179AcpiNsDeleteNode ( 180 ACPI_NAMESPACE_NODE *Node) 181{ 182 ACPI_NAMESPACE_NODE *ParentNode; 183 ACPI_NAMESPACE_NODE *PrevNode; 184 ACPI_NAMESPACE_NODE *NextNode; 185 186 187 ACPI_FUNCTION_TRACE_PTR ("NsDeleteNode", Node); 188 189 190 ParentNode = AcpiNsGetParentNode (Node); 191 192 PrevNode = NULL; 193 NextNode = ParentNode->Child; 194 195 /* Find the node that is the previous peer in the parent's child list */ 196 197 while (NextNode != Node) 198 { 199 PrevNode = NextNode; 200 NextNode = PrevNode->Peer; 201 } 202 203 if (PrevNode) 204 { 205 /* Node is not first child, unlink it */ 206 207 PrevNode->Peer = NextNode->Peer; 208 if (NextNode->Flags & ANOBJ_END_OF_PEER_LIST) 209 { 210 PrevNode->Flags |= ANOBJ_END_OF_PEER_LIST; 211 } 212 } 213 else 214 { 215 /* Node is first child (has no previous peer) */ 216 217 if (NextNode->Flags & ANOBJ_END_OF_PEER_LIST) 218 { 219 /* No peers at all */ 220 221 ParentNode->Child = NULL; 222 } 223 else 224 { /* Link peer list to parent */ 225 226 ParentNode->Child = NextNode->Peer; 227 } 228 } 229 230 231 ACPI_MEM_TRACKING (AcpiGbl_MemoryLists[ACPI_MEM_LIST_NSNODE].TotalFreed++); 232 233 /* 234 * Detach an object if there is one then delete the node 235 */ 236 AcpiNsDetachObject (Node); 237 ACPI_MEM_FREE (Node); 238 return_VOID; 239} 240 241 242#ifdef ACPI_ALPHABETIC_NAMESPACE 243/******************************************************************************* 244 * 245 * FUNCTION: AcpiNsCompareNames 246 * 247 * PARAMETERS: Name1 - First name to compare 248 * Name2 - Second name to compare 249 * 250 * RETURN: value from strncmp 251 * 252 * DESCRIPTION: Compare two ACPI names. Names that are prefixed with an 253 * underscore are forced to be alphabetically first. 254 * 255 ******************************************************************************/ 256 257int 258AcpiNsCompareNames ( 259 char *Name1, 260 char *Name2) 261{ 262 char ReversedName1[ACPI_NAME_SIZE]; 263 char ReversedName2[ACPI_NAME_SIZE]; 264 UINT32 i; 265 UINT32 j; 266 267 268 /* 269 * Replace all instances of "underscore" with a value that is smaller so 270 * that all names that are prefixed with underscore(s) are alphabetically 271 * first. 272 * 273 * Reverse the name bytewise so we can just do a 32-bit compare instead 274 * of a strncmp. 275 */ 276 for (i = 0, j= (ACPI_NAME_SIZE - 1); i < ACPI_NAME_SIZE; i++, j--) 277 { 278 ReversedName1[j] = Name1[i]; 279 if (Name1[i] == '_') 280 { 281 ReversedName1[j] = '*'; 282 } 283 284 ReversedName2[j] = Name2[i]; 285 if (Name2[i] == '_') 286 { 287 ReversedName2[j] = '*'; 288 } 289 } 290 291 return (*(int *) ReversedName1 - *(int *) ReversedName2); 292} 293#endif 294 295 296/******************************************************************************* 297 * 298 * FUNCTION: AcpiNsInstallNode 299 * 300 * PARAMETERS: WalkState - Current state of the walk 301 * ParentNode - The parent of the new Node 302 * Node - The new Node to install 303 * Type - ACPI object type of the new Node 304 * 305 * RETURN: None 306 * 307 * DESCRIPTION: Initialize a new namespace node and install it amongst 308 * its peers. 309 * 310 * Note: Current namespace lookup is linear search. However, the 311 * nodes are linked in alphabetical order to 1) put all reserved 312 * names (start with underscore) first, and to 2) make a readable 313 * namespace dump. 314 * 315 ******************************************************************************/ 316 317void 318AcpiNsInstallNode ( 319 ACPI_WALK_STATE *WalkState, 320 ACPI_NAMESPACE_NODE *ParentNode, /* Parent */ 321 ACPI_NAMESPACE_NODE *Node, /* New Child*/ 322 ACPI_OBJECT_TYPE Type) 323{ 324 UINT16 OwnerId = 0; 325 ACPI_NAMESPACE_NODE *ChildNode; 326#ifdef ACPI_ALPHABETIC_NAMESPACE 327 328 ACPI_NAMESPACE_NODE *PreviousChildNode; 329#endif 330 331 332 ACPI_FUNCTION_TRACE ("NsInstallNode"); 333 334 335 /* 336 * Get the owner ID from the Walk state 337 * The owner ID is used to track table deletion and 338 * deletion of objects created by methods 339 */ 340 if (WalkState) 341 { 342 OwnerId = WalkState->OwnerId; 343 } 344 345 /* Link the new entry into the parent and existing children */ 346 347 ChildNode = ParentNode->Child; 348 if (!ChildNode) 349 { 350 ParentNode->Child = Node; 351 Node->Flags |= ANOBJ_END_OF_PEER_LIST; 352 Node->Peer = ParentNode; 353 } 354 else 355 { 356#ifdef ACPI_ALPHABETIC_NAMESPACE 357 /* 358 * Walk the list whilst searching for the correct 359 * alphabetic placement. 360 */ 361 PreviousChildNode = NULL; 362 while (AcpiNsCompareNames (AcpiUtGetNodeName (ChildNode), AcpiUtGetNodeName (Node)) < 0) 363 { 364 if (ChildNode->Flags & ANOBJ_END_OF_PEER_LIST) 365 { 366 /* Last peer; Clear end-of-list flag */ 367 368 ChildNode->Flags &= ~ANOBJ_END_OF_PEER_LIST; 369 370 /* This node is the new peer to the child node */ 371 372 ChildNode->Peer = Node; 373 374 /* This node is the new end-of-list */ 375 376 Node->Flags |= ANOBJ_END_OF_PEER_LIST; 377 Node->Peer = ParentNode; 378 break; 379 } 380 381 /* Get next peer */ 382 383 PreviousChildNode = ChildNode; 384 ChildNode = ChildNode->Peer; 385 } 386 387 /* Did the node get inserted at the end-of-list? */ 388 389 if (!(Node->Flags & ANOBJ_END_OF_PEER_LIST)) 390 { 391 /* 392 * Loop above terminated without reaching the end-of-list. 393 * Insert the new node at the current location 394 */ 395 if (PreviousChildNode) 396 { 397 /* Insert node alphabetically */ 398 399 Node->Peer = ChildNode; 400 PreviousChildNode->Peer = Node; 401 } 402 else 403 { 404 /* Insert node alphabetically at start of list */ 405 406 Node->Peer = ChildNode; 407 ParentNode->Child = Node; 408 } 409 } 410#else 411 while (!(ChildNode->Flags & ANOBJ_END_OF_PEER_LIST)) 412 { 413 ChildNode = ChildNode->Peer; 414 } 415 416 ChildNode->Peer = Node; 417 418 /* Clear end-of-list flag */ 419 420 ChildNode->Flags &= ~ANOBJ_END_OF_PEER_LIST; 421 Node->Flags |= ANOBJ_END_OF_PEER_LIST; 422 Node->Peer = ParentNode; 423#endif 424 } 425 426 /* Init the new entry */ 427 428 Node->OwnerId = OwnerId; 429 Node->Type = (UINT8) Type; 430 431 ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, 432 "%4.4s (%s) [Node %p Owner %X] added to %4.4s (%s) [Node %p]\n", 433 AcpiUtGetNodeName (Node), AcpiUtGetTypeName (Node->Type), Node, OwnerId, 434 AcpiUtGetNodeName (ParentNode), AcpiUtGetTypeName (ParentNode->Type), 435 ParentNode)); 436 437 /* 438 * Increment the reference count(s) of all parents up to 439 * the root! 440 */ 441 while ((Node = AcpiNsGetParentNode (Node)) != NULL) 442 { 443 Node->ReferenceCount++; 444 } 445 446 return_VOID; 447} 448 449 450/******************************************************************************* 451 * 452 * FUNCTION: AcpiNsDeleteChildren 453 * 454 * PARAMETERS: ParentNode - Delete this objects children 455 * 456 * RETURN: None. 457 * 458 * DESCRIPTION: Delete all children of the parent object. In other words, 459 * deletes a "scope". 460 * 461 ******************************************************************************/ 462 463void 464AcpiNsDeleteChildren ( 465 ACPI_NAMESPACE_NODE *ParentNode) 466{ 467 ACPI_NAMESPACE_NODE *ChildNode; 468 ACPI_NAMESPACE_NODE *NextNode; 469 ACPI_NAMESPACE_NODE *Node; 470 UINT8 Flags; 471 472 473 ACPI_FUNCTION_TRACE_PTR ("NsDeleteChildren", ParentNode); 474 475 476 if (!ParentNode) 477 { 478 return_VOID; 479 } 480 481 /* If no children, all done! */ 482 483 ChildNode = ParentNode->Child; 484 if (!ChildNode) 485 { 486 return_VOID; 487 } 488 489 /* 490 * Deallocate all children at this level 491 */ 492 do 493 { 494 /* Get the things we need */ 495 496 NextNode = ChildNode->Peer; 497 Flags = ChildNode->Flags; 498 499 /* Grandchildren should have all been deleted already */ 500 501 if (ChildNode->Child) 502 { 503 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Found a grandchild! P=%p C=%p\n", 504 ParentNode, ChildNode)); 505 } 506 507 /* Now we can free this child object */ 508 509 ACPI_MEM_TRACKING (AcpiGbl_MemoryLists[ACPI_MEM_LIST_NSNODE].TotalFreed++); 510 511 ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Object %p, Remaining %X\n", 512 ChildNode, AcpiGbl_CurrentNodeCount)); 513 514 /* 515 * Detach an object if there is one, then free the child node 516 */ 517 AcpiNsDetachObject (ChildNode); 518 519 /* 520 * Decrement the reference count(s) of all parents up to 521 * the root! (counts were incremented when the node was created) 522 */ 523 Node = ChildNode; 524 while ((Node = AcpiNsGetParentNode (Node)) != NULL) 525 { 526 Node->ReferenceCount--; 527 } 528 529 /* There should be only one reference remaining on this node */ 530 531 if (ChildNode->ReferenceCount != 1) 532 { 533 ACPI_REPORT_WARNING (("Existing references (%d) on node being deleted (%p)\n", 534 ChildNode->ReferenceCount, ChildNode)); 535 } 536 537 /* Now we can delete the node */ 538 539 ACPI_MEM_FREE (ChildNode); 540 541 /* And move on to the next child in the list */ 542 543 ChildNode = NextNode; 544 545 } while (!(Flags & ANOBJ_END_OF_PEER_LIST)); 546 547 548 /* Clear the parent's child pointer */ 549 550 ParentNode->Child = NULL; 551 552 return_VOID; 553} 554 555 556/******************************************************************************* 557 * 558 * FUNCTION: AcpiNsDeleteNamespaceSubtree 559 * 560 * PARAMETERS: ParentNode - Root of the subtree to be deleted 561 * 562 * RETURN: None. 563 * 564 * DESCRIPTION: Delete a subtree of the namespace. This includes all objects 565 * stored within the subtree. 566 * 567 ******************************************************************************/ 568 569void 570AcpiNsDeleteNamespaceSubtree ( 571 ACPI_NAMESPACE_NODE *ParentNode) 572{ 573 ACPI_NAMESPACE_NODE *ChildNode = NULL; 574 UINT32 Level = 1; 575 576 577 ACPI_FUNCTION_TRACE ("NsDeleteNamespaceSubtree"); 578 579 580 if (!ParentNode) 581 { 582 return_VOID; 583 } 584 585 /* 586 * Traverse the tree of objects until we bubble back up 587 * to where we started. 588 */ 589 while (Level > 0) 590 { 591 /* Get the next node in this scope (NULL if none) */ 592 593 ChildNode = AcpiNsGetNextNode (ACPI_TYPE_ANY, ParentNode, 594 ChildNode); 595 if (ChildNode) 596 { 597 /* Found a child node - detach any attached object */ 598 599 AcpiNsDetachObject (ChildNode); 600 601 /* Check if this node has any children */ 602 603 if (AcpiNsGetNextNode (ACPI_TYPE_ANY, ChildNode, 0)) 604 { 605 /* 606 * There is at least one child of this node, 607 * visit the node 608 */ 609 Level++; 610 ParentNode = ChildNode; 611 ChildNode = 0; 612 } 613 } 614 else 615 { 616 /* 617 * No more children of this parent node. 618 * Move up to the grandparent. 619 */ 620 Level--; 621 622 /* 623 * Now delete all of the children of this parent 624 * all at the same time. 625 */ 626 AcpiNsDeleteChildren (ParentNode); 627 628 /* New "last child" is this parent node */ 629 630 ChildNode = ParentNode; 631 632 /* Move up the tree to the grandparent */ 633 634 ParentNode = AcpiNsGetParentNode (ParentNode); 635 } 636 } 637 638 return_VOID; 639} 640 641 642/******************************************************************************* 643 * 644 * FUNCTION: AcpiNsRemoveReference 645 * 646 * PARAMETERS: Node - Named node whose reference count is to be 647 * decremented 648 * 649 * RETURN: None. 650 * 651 * DESCRIPTION: Remove a Node reference. Decrements the reference count 652 * of all parent Nodes up to the root. Any node along 653 * the way that reaches zero references is freed. 654 * 655 ******************************************************************************/ 656 657void 658AcpiNsRemoveReference ( 659 ACPI_NAMESPACE_NODE *Node) 660{ 661 ACPI_NAMESPACE_NODE *ParentNode; 662 ACPI_NAMESPACE_NODE *ThisNode; 663 664 665 ACPI_FUNCTION_ENTRY (); 666 667 668 /* 669 * Decrement the reference count(s) of this node and all 670 * nodes up to the root, Delete anything with zero remaining references. 671 */ 672 ThisNode = Node; 673 while (ThisNode) 674 { 675 /* Prepare to move up to parent */ 676 677 ParentNode = AcpiNsGetParentNode (ThisNode); 678 679 /* Decrement the reference count on this node */ 680 681 ThisNode->ReferenceCount--; 682 683 /* Delete the node if no more references */ 684 685 if (!ThisNode->ReferenceCount) 686 { 687 /* Delete all children and delete the node */ 688 689 AcpiNsDeleteChildren (ThisNode); 690 AcpiNsDeleteNode (ThisNode); 691 } 692 693 ThisNode = ParentNode; 694 } 695} 696 697 698/******************************************************************************* 699 * 700 * FUNCTION: AcpiNsDeleteNamespaceByOwner 701 * 702 * PARAMETERS: OwnerId - All nodes with this owner will be deleted 703 * 704 * RETURN: Status 705 * 706 * DESCRIPTION: Delete entries within the namespace that are owned by a 707 * specific ID. Used to delete entire ACPI tables. All 708 * reference counts are updated. 709 * 710 ******************************************************************************/ 711 712void 713AcpiNsDeleteNamespaceByOwner ( 714 UINT16 OwnerId) 715{ 716 ACPI_NAMESPACE_NODE *ChildNode; 717 ACPI_NAMESPACE_NODE *DeletionNode; 718 UINT32 Level; 719 ACPI_NAMESPACE_NODE *ParentNode; 720 721 722 ACPI_FUNCTION_TRACE_U32 ("NsDeleteNamespaceByOwner", OwnerId); 723 724 725 ParentNode = AcpiGbl_RootNode; 726 ChildNode = NULL; 727 DeletionNode = NULL; 728 Level = 1; 729 730 /* 731 * Traverse the tree of nodes until we bubble back up 732 * to where we started. 733 */ 734 while (Level > 0) 735 { 736 /* 737 * Get the next child of this parent node. When ChildNode is NULL, 738 * the first child of the parent is returned 739 */ 740 ChildNode = AcpiNsGetNextNode (ACPI_TYPE_ANY, ParentNode, ChildNode); 741 742 if (DeletionNode) 743 { 744 AcpiNsRemoveReference (DeletionNode); 745 DeletionNode = NULL; 746 } 747 748 if (ChildNode) 749 { 750 if (ChildNode->OwnerId == OwnerId) 751 { 752 /* Found a matching child node - detach any attached object */ 753 754 AcpiNsDetachObject (ChildNode); 755 } 756 757 /* Check if this node has any children */ 758 759 if (AcpiNsGetNextNode (ACPI_TYPE_ANY, ChildNode, NULL)) 760 { 761 /* 762 * There is at least one child of this node, 763 * visit the node 764 */ 765 Level++; 766 ParentNode = ChildNode; 767 ChildNode = NULL; 768 } 769 else if (ChildNode->OwnerId == OwnerId) 770 { 771 DeletionNode = ChildNode; 772 } 773 } 774 else 775 { 776 /* 777 * No more children of this parent node. 778 * Move up to the grandparent. 779 */ 780 Level--; 781 if (Level != 0) 782 { 783 if (ParentNode->OwnerId == OwnerId) 784 { 785 DeletionNode = ParentNode; 786 } 787 } 788 789 /* New "last child" is this parent node */ 790 791 ChildNode = ParentNode; 792 793 /* Move up the tree to the grandparent */ 794 795 ParentNode = AcpiNsGetParentNode (ParentNode); 796 } 797 } 798 799 return_VOID; 800} 801 802 803