Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[sfrench/cifs-2.6.git] / drivers / acpi / acpica / tbxface.c
1 /******************************************************************************
2  *
3  * Module Name: tbxface - Public interfaces to the ACPI subsystem
4  *                         ACPI table oriented interfaces
5  *
6  *****************************************************************************/
7
8 /*
9  * Copyright (C) 2000 - 2010, 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 <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "actables.h"
49
50 #define _COMPONENT          ACPI_TABLES
51 ACPI_MODULE_NAME("tbxface")
52
53 /* Local prototypes */
54 static acpi_status acpi_tb_load_namespace(void);
55
56 static int no_auto_ssdt;
57
58 /*******************************************************************************
59  *
60  * FUNCTION:    acpi_allocate_root_table
61  *
62  * PARAMETERS:  initial_table_count - Size of initial_table_array, in number of
63  *                                    struct acpi_table_desc structures
64  *
65  * RETURN:      Status
66  *
67  * DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
68  *              acpi_initialize_tables.
69  *
70  ******************************************************************************/
71
72 acpi_status acpi_allocate_root_table(u32 initial_table_count)
73 {
74
75         acpi_gbl_root_table_list.size = initial_table_count;
76         acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
77
78         return (acpi_tb_resize_root_table_list());
79 }
80
81 /*******************************************************************************
82  *
83  * FUNCTION:    acpi_initialize_tables
84  *
85  * PARAMETERS:  initial_table_array - Pointer to an array of pre-allocated
86  *                                    struct acpi_table_desc structures. If NULL, the
87  *                                    array is dynamically allocated.
88  *              initial_table_count - Size of initial_table_array, in number of
89  *                                    struct acpi_table_desc structures
90  *              allow_realloc       - Flag to tell Table Manager if resize of
91  *                                    pre-allocated array is allowed. Ignored
92  *                                    if initial_table_array is NULL.
93  *
94  * RETURN:      Status
95  *
96  * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
97  *
98  * NOTE:        Allows static allocation of the initial table array in order
99  *              to avoid the use of dynamic memory in confined environments
100  *              such as the kernel boot sequence where it may not be available.
101  *
102  *              If the host OS memory managers are initialized, use NULL for
103  *              initial_table_array, and the table will be dynamically allocated.
104  *
105  ******************************************************************************/
106
107 acpi_status __init
108 acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
109                        u32 initial_table_count, u8 allow_resize)
110 {
111         acpi_physical_address rsdp_address;
112         acpi_status status;
113
114         ACPI_FUNCTION_TRACE(acpi_initialize_tables);
115
116         /*
117          * Set up the Root Table Array
118          * Allocate the table array if requested
119          */
120         if (!initial_table_array) {
121                 status = acpi_allocate_root_table(initial_table_count);
122                 if (ACPI_FAILURE(status)) {
123                         return_ACPI_STATUS(status);
124                 }
125         } else {
126                 /* Root Table Array has been statically allocated by the host */
127
128                 ACPI_MEMSET(initial_table_array, 0,
129                             (acpi_size) initial_table_count *
130                             sizeof(struct acpi_table_desc));
131
132                 acpi_gbl_root_table_list.tables = initial_table_array;
133                 acpi_gbl_root_table_list.size = initial_table_count;
134                 acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
135                 if (allow_resize) {
136                         acpi_gbl_root_table_list.flags |=
137                             ACPI_ROOT_ALLOW_RESIZE;
138                 }
139         }
140
141         /* Get the address of the RSDP */
142
143         rsdp_address = acpi_os_get_root_pointer();
144         if (!rsdp_address) {
145                 return_ACPI_STATUS(AE_NOT_FOUND);
146         }
147
148         /*
149          * Get the root table (RSDT or XSDT) and extract all entries to the local
150          * Root Table Array. This array contains the information of the RSDT/XSDT
151          * in a common, more useable format.
152          */
153         status = acpi_tb_parse_root_table(rsdp_address);
154         return_ACPI_STATUS(status);
155 }
156
157 /*******************************************************************************
158  *
159  * FUNCTION:    acpi_reallocate_root_table
160  *
161  * PARAMETERS:  None
162  *
163  * RETURN:      Status
164  *
165  * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
166  *              root list from the previously provided scratch area. Should
167  *              be called once dynamic memory allocation is available in the
168  *              kernel
169  *
170  ******************************************************************************/
171 acpi_status acpi_reallocate_root_table(void)
172 {
173         struct acpi_table_desc *tables;
174         acpi_size new_size;
175
176         ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
177
178         /*
179          * Only reallocate the root table if the host provided a static buffer
180          * for the table array in the call to acpi_initialize_tables.
181          */
182         if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
183                 return_ACPI_STATUS(AE_SUPPORT);
184         }
185
186         new_size = ((acpi_size) acpi_gbl_root_table_list.count +
187                     ACPI_ROOT_TABLE_SIZE_INCREMENT) *
188             sizeof(struct acpi_table_desc);
189
190         /* Create new array and copy the old array */
191
192         tables = ACPI_ALLOCATE_ZEROED(new_size);
193         if (!tables) {
194                 return_ACPI_STATUS(AE_NO_MEMORY);
195         }
196
197         ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, new_size);
198
199         acpi_gbl_root_table_list.size = acpi_gbl_root_table_list.count;
200         acpi_gbl_root_table_list.tables = tables;
201         acpi_gbl_root_table_list.flags =
202             ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
203
204         return_ACPI_STATUS(AE_OK);
205 }
206
207 /*******************************************************************************
208  *
209  * FUNCTION:    acpi_load_table
210  *
211  * PARAMETERS:  table_ptr       - pointer to a buffer containing the entire
212  *                                table to be loaded
213  *
214  * RETURN:      Status
215  *
216  * DESCRIPTION: This function is called to load a table from the caller's
217  *              buffer. The buffer must contain an entire ACPI Table including
218  *              a valid header. The header fields will be verified, and if it
219  *              is determined that the table is invalid, the call will fail.
220  *
221  ******************************************************************************/
222 acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
223 {
224         acpi_status status;
225         u32 table_index;
226         struct acpi_table_desc table_desc;
227
228         if (!table_ptr)
229                 return AE_BAD_PARAMETER;
230
231         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
232         table_desc.pointer = table_ptr;
233         table_desc.length = table_ptr->length;
234         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
235
236         /*
237          * Install the new table into the local data structures
238          */
239         status = acpi_tb_add_table(&table_desc, &table_index);
240         if (ACPI_FAILURE(status)) {
241                 return status;
242         }
243         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
244         return status;
245 }
246
247 ACPI_EXPORT_SYMBOL(acpi_load_table)
248
249 /*******************************************************************************
250  *
251  * FUNCTION:    acpi_get_table_header
252  *
253  * PARAMETERS:  Signature           - ACPI signature of needed table
254  *              Instance            - Which instance (for SSDTs)
255  *              out_table_header    - The pointer to the table header to fill
256  *
257  * RETURN:      Status and pointer to mapped table header
258  *
259  * DESCRIPTION: Finds an ACPI table header.
260  *
261  * NOTE:        Caller is responsible in unmapping the header with
262  *              acpi_os_unmap_memory
263  *
264  ******************************************************************************/
265 acpi_status
266 acpi_get_table_header(char *signature,
267                       u32 instance, struct acpi_table_header *out_table_header)
268 {
269        u32 i;
270        u32 j;
271         struct acpi_table_header *header;
272
273         /* Parameter validation */
274
275         if (!signature || !out_table_header) {
276                 return (AE_BAD_PARAMETER);
277         }
278
279         /* Walk the root table list */
280
281         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
282                 if (!ACPI_COMPARE_NAME
283                     (&(acpi_gbl_root_table_list.tables[i].signature),
284                      signature)) {
285                         continue;
286                 }
287
288                 if (++j < instance) {
289                         continue;
290                 }
291
292                 if (!acpi_gbl_root_table_list.tables[i].pointer) {
293                         if ((acpi_gbl_root_table_list.tables[i].flags &
294                              ACPI_TABLE_ORIGIN_MASK) ==
295                             ACPI_TABLE_ORIGIN_MAPPED) {
296                                 header =
297                                     acpi_os_map_memory(acpi_gbl_root_table_list.
298                                                        tables[i].address,
299                                                        sizeof(struct
300                                                               acpi_table_header));
301                                 if (!header) {
302                                         return AE_NO_MEMORY;
303                                 }
304                                 ACPI_MEMCPY(out_table_header, header,
305                                             sizeof(struct acpi_table_header));
306                                 acpi_os_unmap_memory(header,
307                                                      sizeof(struct
308                                                             acpi_table_header));
309                         } else {
310                                 return AE_NOT_FOUND;
311                         }
312                 } else {
313                         ACPI_MEMCPY(out_table_header,
314                                     acpi_gbl_root_table_list.tables[i].pointer,
315                                     sizeof(struct acpi_table_header));
316                 }
317                 return (AE_OK);
318         }
319
320         return (AE_NOT_FOUND);
321 }
322
323 ACPI_EXPORT_SYMBOL(acpi_get_table_header)
324
325 /*******************************************************************************
326  *
327  * FUNCTION:    acpi_unload_table_id
328  *
329  * PARAMETERS:  id            - Owner ID of the table to be removed.
330  *
331  * RETURN:      Status
332  *
333  * DESCRIPTION: This routine is used to force the unload of a table (by id)
334  *
335  ******************************************************************************/
336 acpi_status acpi_unload_table_id(acpi_owner_id id)
337 {
338         int i;
339         acpi_status status = AE_NOT_EXIST;
340
341         ACPI_FUNCTION_TRACE(acpi_unload_table_id);
342
343         /* Find table in the global table list */
344         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
345                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
346                         continue;
347                 }
348                 /*
349                  * Delete all namespace objects owned by this table. Note that these
350                  * objects can appear anywhere in the namespace by virtue of the AML
351                  * "Scope" operator. Thus, we need to track ownership by an ID, not
352                  * simply a position within the hierarchy
353                  */
354                 acpi_tb_delete_namespace_by_owner(i);
355                 status = acpi_tb_release_owner_id(i);
356                 acpi_tb_set_table_loaded_flag(i, FALSE);
357                 break;
358         }
359         return_ACPI_STATUS(status);
360 }
361
362 ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
363
364 /*******************************************************************************
365  *
366  * FUNCTION:    acpi_get_table_with_size
367  *
368  * PARAMETERS:  Signature           - ACPI signature of needed table
369  *              Instance            - Which instance (for SSDTs)
370  *              out_table           - Where the pointer to the table is returned
371  *
372  * RETURN:      Status and pointer to table
373  *
374  * DESCRIPTION: Finds and verifies an ACPI table.
375  *
376  ******************************************************************************/
377 acpi_status
378 acpi_get_table_with_size(char *signature,
379                u32 instance, struct acpi_table_header **out_table,
380                acpi_size *tbl_size)
381 {
382        u32 i;
383        u32 j;
384         acpi_status status;
385
386         /* Parameter validation */
387
388         if (!signature || !out_table) {
389                 return (AE_BAD_PARAMETER);
390         }
391
392         /* Walk the root table list */
393
394         for (i = 0, j = 0; i < acpi_gbl_root_table_list.count; i++) {
395                 if (!ACPI_COMPARE_NAME
396                     (&(acpi_gbl_root_table_list.tables[i].signature),
397                      signature)) {
398                         continue;
399                 }
400
401                 if (++j < instance) {
402                         continue;
403                 }
404
405                 status =
406                     acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
407                 if (ACPI_SUCCESS(status)) {
408                         *out_table = acpi_gbl_root_table_list.tables[i].pointer;
409                         *tbl_size = acpi_gbl_root_table_list.tables[i].length;
410                 }
411
412                 if (!acpi_gbl_permanent_mmap) {
413                         acpi_gbl_root_table_list.tables[i].pointer = NULL;
414                 }
415
416                 return (status);
417         }
418
419         return (AE_NOT_FOUND);
420 }
421
422 acpi_status
423 acpi_get_table(char *signature,
424                u32 instance, struct acpi_table_header **out_table)
425 {
426         acpi_size tbl_size;
427
428         return acpi_get_table_with_size(signature,
429                        instance, out_table, &tbl_size);
430 }
431 ACPI_EXPORT_SYMBOL(acpi_get_table)
432
433 /*******************************************************************************
434  *
435  * FUNCTION:    acpi_get_table_by_index
436  *
437  * PARAMETERS:  table_index         - Table index
438  *              Table               - Where the pointer to the table is returned
439  *
440  * RETURN:      Status and pointer to the table
441  *
442  * DESCRIPTION: Obtain a table by an index into the global table list.
443  *
444  ******************************************************************************/
445 acpi_status
446 acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
447 {
448         acpi_status status;
449
450         ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
451
452         /* Parameter validation */
453
454         if (!table) {
455                 return_ACPI_STATUS(AE_BAD_PARAMETER);
456         }
457
458         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
459
460         /* Validate index */
461
462         if (table_index >= acpi_gbl_root_table_list.count) {
463                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
464                 return_ACPI_STATUS(AE_BAD_PARAMETER);
465         }
466
467         if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
468
469                 /* Table is not mapped, map it */
470
471                 status =
472                     acpi_tb_verify_table(&acpi_gbl_root_table_list.
473                                          tables[table_index]);
474                 if (ACPI_FAILURE(status)) {
475                         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
476                         return_ACPI_STATUS(status);
477                 }
478         }
479
480         *table = acpi_gbl_root_table_list.tables[table_index].pointer;
481         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
482         return_ACPI_STATUS(AE_OK);
483 }
484
485 ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
486
487 /*******************************************************************************
488  *
489  * FUNCTION:    acpi_tb_load_namespace
490  *
491  * PARAMETERS:  None
492  *
493  * RETURN:      Status
494  *
495  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
496  *              the RSDT/XSDT.
497  *
498  ******************************************************************************/
499 static acpi_status acpi_tb_load_namespace(void)
500 {
501         acpi_status status;
502         u32 i;
503
504         ACPI_FUNCTION_TRACE(tb_load_namespace);
505
506         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
507
508         /*
509          * Load the namespace. The DSDT is required, but any SSDT and PSDT tables
510          * are optional.
511          */
512         if (!acpi_gbl_root_table_list.count ||
513             !ACPI_COMPARE_NAME(&
514                                (acpi_gbl_root_table_list.
515                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
516                                ACPI_SIG_DSDT)
517             ||
518             ACPI_FAILURE(acpi_tb_verify_table
519                          (&acpi_gbl_root_table_list.
520                           tables[ACPI_TABLE_INDEX_DSDT]))) {
521                 status = AE_NO_ACPI_TABLES;
522                 goto unlock_and_exit;
523         }
524
525         /* A valid DSDT is required */
526
527         status =
528             acpi_tb_verify_table(&acpi_gbl_root_table_list.
529                                  tables[ACPI_TABLE_INDEX_DSDT]);
530         if (ACPI_FAILURE(status)) {
531
532                 status = AE_NO_ACPI_TABLES;
533                 goto unlock_and_exit;
534         }
535
536         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
537
538         /* Load and parse tables */
539
540         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
541         if (ACPI_FAILURE(status)) {
542                 return_ACPI_STATUS(status);
543         }
544
545         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
546
547         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
548         for (i = 0; i < acpi_gbl_root_table_list.count; ++i) {
549                 if ((!ACPI_COMPARE_NAME
550                      (&(acpi_gbl_root_table_list.tables[i].signature),
551                       ACPI_SIG_SSDT)
552                      &&
553                      !ACPI_COMPARE_NAME(&
554                                         (acpi_gbl_root_table_list.tables[i].
555                                          signature), ACPI_SIG_PSDT))
556                     ||
557                     ACPI_FAILURE(acpi_tb_verify_table
558                                  (&acpi_gbl_root_table_list.tables[i]))) {
559                         continue;
560                 }
561
562                 if (no_auto_ssdt) {
563                         printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
564                         continue;
565                 }
566
567                 /* Ignore errors while loading tables, get as many as possible */
568
569                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
570                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
571                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
572         }
573
574         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
575
576       unlock_and_exit:
577         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
578         return_ACPI_STATUS(status);
579 }
580
581 /*******************************************************************************
582  *
583  * FUNCTION:    acpi_load_tables
584  *
585  * PARAMETERS:  None
586  *
587  * RETURN:      Status
588  *
589  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
590  *
591  ******************************************************************************/
592
593 acpi_status acpi_load_tables(void)
594 {
595         acpi_status status;
596
597         ACPI_FUNCTION_TRACE(acpi_load_tables);
598
599         /* Load the namespace from the tables */
600
601         status = acpi_tb_load_namespace();
602         if (ACPI_FAILURE(status)) {
603                 ACPI_EXCEPTION((AE_INFO, status,
604                                 "While loading namespace from ACPI tables"));
605         }
606
607         return_ACPI_STATUS(status);
608 }
609
610 ACPI_EXPORT_SYMBOL(acpi_load_tables)
611
612
613 /*******************************************************************************
614  *
615  * FUNCTION:    acpi_install_table_handler
616  *
617  * PARAMETERS:  Handler         - Table event handler
618  *              Context         - Value passed to the handler on each event
619  *
620  * RETURN:      Status
621  *
622  * DESCRIPTION: Install table event handler
623  *
624  ******************************************************************************/
625 acpi_status
626 acpi_install_table_handler(acpi_tbl_handler handler, void *context)
627 {
628         acpi_status status;
629
630         ACPI_FUNCTION_TRACE(acpi_install_table_handler);
631
632         if (!handler) {
633                 return_ACPI_STATUS(AE_BAD_PARAMETER);
634         }
635
636         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
637         if (ACPI_FAILURE(status)) {
638                 return_ACPI_STATUS(status);
639         }
640
641         /* Don't allow more than one handler */
642
643         if (acpi_gbl_table_handler) {
644                 status = AE_ALREADY_EXISTS;
645                 goto cleanup;
646         }
647
648         /* Install the handler */
649
650         acpi_gbl_table_handler = handler;
651         acpi_gbl_table_handler_context = context;
652
653       cleanup:
654         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
655         return_ACPI_STATUS(status);
656 }
657
658 ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
659
660 /*******************************************************************************
661  *
662  * FUNCTION:    acpi_remove_table_handler
663  *
664  * PARAMETERS:  Handler         - Table event handler that was installed
665  *                                previously.
666  *
667  * RETURN:      Status
668  *
669  * DESCRIPTION: Remove table event handler
670  *
671  ******************************************************************************/
672 acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
673 {
674         acpi_status status;
675
676         ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
677
678         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
679         if (ACPI_FAILURE(status)) {
680                 return_ACPI_STATUS(status);
681         }
682
683         /* Make sure that the installed handler is the same */
684
685         if (!handler || handler != acpi_gbl_table_handler) {
686                 status = AE_BAD_PARAMETER;
687                 goto cleanup;
688         }
689
690         /* Remove the handler */
691
692         acpi_gbl_table_handler = NULL;
693
694       cleanup:
695         (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
696         return_ACPI_STATUS(status);
697 }
698
699 ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
700
701
702 static int __init acpi_no_auto_ssdt_setup(char *s) {
703
704         printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
705
706         no_auto_ssdt = 1;
707
708         return 1;
709 }
710
711 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);