Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
b7ed9a8e | 3 | * Module Name: tbxface - ACPI table-oriented external interfaces |
1da177e4 LT |
4 | * |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
25f044e6 | 8 | * Copyright (C) 2000 - 2013, Intel Corp. |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
214f2c90 | 44 | #include <linux/export.h> |
1da177e4 | 45 | #include <acpi/acpi.h> |
e2f7a777 | 46 | #include "accommon.h" |
e2f7a777 | 47 | #include "actables.h" |
1da177e4 | 48 | |
1da177e4 | 49 | #define _COMPONENT ACPI_TABLES |
4be44fcd | 50 | ACPI_MODULE_NAME("tbxface") |
1da177e4 | 51 | |
77389e12 BM |
52 | /******************************************************************************* |
53 | * | |
54 | * FUNCTION: acpi_allocate_root_table | |
55 | * | |
56 | * PARAMETERS: initial_table_count - Size of initial_table_array, in number of | |
57 | * struct acpi_table_desc structures | |
58 | * | |
59 | * RETURN: Status | |
60 | * | |
ba494bee | 61 | * DESCRIPTION: Allocate a root table array. Used by iASL compiler and |
77389e12 BM |
62 | * acpi_initialize_tables. |
63 | * | |
64 | ******************************************************************************/ | |
77389e12 BM |
65 | acpi_status acpi_allocate_root_table(u32 initial_table_count) |
66 | { | |
67 | ||
b9ee2043 | 68 | acpi_gbl_root_table_list.max_table_count = initial_table_count; |
77389e12 BM |
69 | acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE; |
70 | ||
71 | return (acpi_tb_resize_root_table_list()); | |
72 | } | |
73 | ||
1da177e4 LT |
74 | /******************************************************************************* |
75 | * | |
f3d2e786 | 76 | * FUNCTION: acpi_initialize_tables |
1da177e4 | 77 | * |
f3d2e786 BM |
78 | * PARAMETERS: initial_table_array - Pointer to an array of pre-allocated |
79 | * struct acpi_table_desc structures. If NULL, the | |
80 | * array is dynamically allocated. | |
81 | * initial_table_count - Size of initial_table_array, in number of | |
82 | * struct acpi_table_desc structures | |
b7ed9a8e | 83 | * allow_resize - Flag to tell Table Manager if resize of |
f3d2e786 BM |
84 | * pre-allocated array is allowed. Ignored |
85 | * if initial_table_array is NULL. | |
1da177e4 LT |
86 | * |
87 | * RETURN: Status | |
88 | * | |
f3d2e786 BM |
89 | * DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT. |
90 | * | |
91 | * NOTE: Allows static allocation of the initial table array in order | |
92 | * to avoid the use of dynamic memory in confined environments | |
93 | * such as the kernel boot sequence where it may not be available. | |
94 | * | |
95 | * If the host OS memory managers are initialized, use NULL for | |
96 | * initial_table_array, and the table will be dynamically allocated. | |
1da177e4 LT |
97 | * |
98 | ******************************************************************************/ | |
f3d2e786 | 99 | |
ad71860a | 100 | acpi_status __init |
77389e12 | 101 | acpi_initialize_tables(struct acpi_table_desc * initial_table_array, |
f3d2e786 | 102 | u32 initial_table_count, u8 allow_resize) |
1da177e4 | 103 | { |
c5fc42ac | 104 | acpi_physical_address rsdp_address; |
4be44fcd | 105 | acpi_status status; |
1da177e4 | 106 | |
f3d2e786 | 107 | ACPI_FUNCTION_TRACE(acpi_initialize_tables); |
1da177e4 | 108 | |
f3d2e786 | 109 | /* |
b7ed9a8e TC |
110 | * Setup the Root Table Array and allocate the table array |
111 | * if requested | |
f3d2e786 BM |
112 | */ |
113 | if (!initial_table_array) { | |
77389e12 | 114 | status = acpi_allocate_root_table(initial_table_count); |
f3d2e786 BM |
115 | if (ACPI_FAILURE(status)) { |
116 | return_ACPI_STATUS(status); | |
117 | } | |
118 | } else { | |
119 | /* Root Table Array has been statically allocated by the host */ | |
120 | ||
a4bbb810 | 121 | ACPI_MEMSET(initial_table_array, 0, |
67a119f9 | 122 | (acpi_size) initial_table_count * |
a4bbb810 | 123 | sizeof(struct acpi_table_desc)); |
c5fc42ac | 124 | |
f3d2e786 | 125 | acpi_gbl_root_table_list.tables = initial_table_array; |
b9ee2043 | 126 | acpi_gbl_root_table_list.max_table_count = initial_table_count; |
c5fc42ac | 127 | acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN; |
f3d2e786 | 128 | if (allow_resize) { |
c5fc42ac BM |
129 | acpi_gbl_root_table_list.flags |= |
130 | ACPI_ROOT_ALLOW_RESIZE; | |
f3d2e786 | 131 | } |
1da177e4 LT |
132 | } |
133 | ||
c5fc42ac | 134 | /* Get the address of the RSDP */ |
1da177e4 | 135 | |
c5fc42ac BM |
136 | rsdp_address = acpi_os_get_root_pointer(); |
137 | if (!rsdp_address) { | |
f3d2e786 BM |
138 | return_ACPI_STATUS(AE_NOT_FOUND); |
139 | } | |
1da177e4 | 140 | |
f3d2e786 BM |
141 | /* |
142 | * Get the root table (RSDT or XSDT) and extract all entries to the local | |
143 | * Root Table Array. This array contains the information of the RSDT/XSDT | |
144 | * in a common, more useable format. | |
145 | */ | |
97cbb7d1 | 146 | status = acpi_tb_parse_root_table(rsdp_address); |
f3d2e786 BM |
147 | return_ACPI_STATUS(status); |
148 | } | |
1da177e4 | 149 | |
f3d2e786 BM |
150 | /******************************************************************************* |
151 | * | |
152 | * FUNCTION: acpi_reallocate_root_table | |
153 | * | |
154 | * PARAMETERS: None | |
155 | * | |
156 | * RETURN: Status | |
157 | * | |
158 | * DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the | |
159 | * root list from the previously provided scratch area. Should | |
160 | * be called once dynamic memory allocation is available in the | |
2bc198c1 | 161 | * kernel. |
f3d2e786 BM |
162 | * |
163 | ******************************************************************************/ | |
164 | acpi_status acpi_reallocate_root_table(void) | |
165 | { | |
2bc198c1 | 166 | acpi_status status; |
f3d2e786 BM |
167 | |
168 | ACPI_FUNCTION_TRACE(acpi_reallocate_root_table); | |
169 | ||
170 | /* | |
171 | * Only reallocate the root table if the host provided a static buffer | |
172 | * for the table array in the call to acpi_initialize_tables. | |
173 | */ | |
c5fc42ac | 174 | if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) { |
f3d2e786 | 175 | return_ACPI_STATUS(AE_SUPPORT); |
1da177e4 LT |
176 | } |
177 | ||
2bc198c1 | 178 | acpi_gbl_root_table_list.flags |= ACPI_ROOT_ALLOW_RESIZE; |
1da177e4 | 179 | |
2bc198c1 LZ |
180 | status = acpi_tb_resize_root_table_list(); |
181 | return_ACPI_STATUS(status); | |
f3d2e786 | 182 | } |
fd350943 | 183 | |
ec41f193 | 184 | /******************************************************************************* |
f3d2e786 BM |
185 | * |
186 | * FUNCTION: acpi_get_table_header | |
187 | * | |
ba494bee BM |
188 | * PARAMETERS: signature - ACPI signature of needed table |
189 | * instance - Which instance (for SSDTs) | |
428f2112 | 190 | * out_table_header - The pointer to the table header to fill |
f3d2e786 BM |
191 | * |
192 | * RETURN: Status and pointer to mapped table header | |
193 | * | |
194 | * DESCRIPTION: Finds an ACPI table header. | |
195 | * | |
196 | * NOTE: Caller is responsible in unmapping the header with | |
197 | * acpi_os_unmap_memory | |
198 | * | |
ec41f193 | 199 | ******************************************************************************/ |
f3d2e786 BM |
200 | acpi_status |
201 | acpi_get_table_header(char *signature, | |
67a119f9 | 202 | u32 instance, struct acpi_table_header *out_table_header) |
f3d2e786 | 203 | { |
67a119f9 BM |
204 | u32 i; |
205 | u32 j; | |
428f2112 | 206 | struct acpi_table_header *header; |
0c9938cc | 207 | |
c5fc42ac BM |
208 | /* Parameter validation */ |
209 | ||
210 | if (!signature || !out_table_header) { | |
211 | return (AE_BAD_PARAMETER); | |
212 | } | |
213 | ||
ec41f193 BM |
214 | /* Walk the root table list */ |
215 | ||
b9ee2043 BM |
216 | for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count; |
217 | i++) { | |
f3d2e786 BM |
218 | if (!ACPI_COMPARE_NAME |
219 | (&(acpi_gbl_root_table_list.tables[i].signature), | |
220 | signature)) { | |
221 | continue; | |
0c9938cc RM |
222 | } |
223 | ||
f3d2e786 BM |
224 | if (++j < instance) { |
225 | continue; | |
226 | } | |
1da177e4 | 227 | |
428f2112 | 228 | if (!acpi_gbl_root_table_list.tables[i].pointer) { |
ec41f193 BM |
229 | if ((acpi_gbl_root_table_list.tables[i].flags & |
230 | ACPI_TABLE_ORIGIN_MASK) == | |
428f2112 AS |
231 | ACPI_TABLE_ORIGIN_MAPPED) { |
232 | header = | |
233 | acpi_os_map_memory(acpi_gbl_root_table_list. | |
234 | tables[i].address, | |
235 | sizeof(struct | |
236 | acpi_table_header)); | |
237 | if (!header) { | |
68aafc35 | 238 | return (AE_NO_MEMORY); |
428f2112 AS |
239 | } |
240 | ACPI_MEMCPY(out_table_header, header, | |
241 | sizeof(struct acpi_table_header)); | |
242 | acpi_os_unmap_memory(header, | |
243 | sizeof(struct | |
244 | acpi_table_header)); | |
245 | } else { | |
68aafc35 | 246 | return (AE_NOT_FOUND); |
428f2112 AS |
247 | } |
248 | } else { | |
249 | ACPI_MEMCPY(out_table_header, | |
250 | acpi_gbl_root_table_list.tables[i].pointer, | |
251 | sizeof(struct acpi_table_header)); | |
f3d2e786 | 252 | } |
f3d2e786 | 253 | return (AE_OK); |
1da177e4 LT |
254 | } |
255 | ||
f3d2e786 | 256 | return (AE_NOT_FOUND); |
1da177e4 LT |
257 | } |
258 | ||
f3d2e786 | 259 | ACPI_EXPORT_SYMBOL(acpi_get_table_header) |
8313524a | 260 | |
ec41f193 | 261 | /******************************************************************************* |
0f0fe1a0 JK |
262 | * |
263 | * FUNCTION: acpi_unload_table_id | |
264 | * | |
f3d2e786 | 265 | * PARAMETERS: id - Owner ID of the table to be removed. |
0f0fe1a0 JK |
266 | * |
267 | * RETURN: Status | |
268 | * | |
269 | * DESCRIPTION: This routine is used to force the unload of a table (by id) | |
270 | * | |
271 | ******************************************************************************/ | |
f3d2e786 | 272 | acpi_status acpi_unload_table_id(acpi_owner_id id) |
0f0fe1a0 | 273 | { |
f3d2e786 BM |
274 | int i; |
275 | acpi_status status = AE_NOT_EXIST; | |
0f0fe1a0 | 276 | |
ecb5f752 | 277 | ACPI_FUNCTION_TRACE(acpi_unload_table_id); |
0f0fe1a0 | 278 | |
ecb5f752 | 279 | /* Find table in the global table list */ |
b9ee2043 | 280 | for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { |
f3d2e786 BM |
281 | if (id != acpi_gbl_root_table_list.tables[i].owner_id) { |
282 | continue; | |
283 | } | |
284 | /* | |
fd350943 LB |
285 | * Delete all namespace objects owned by this table. Note that these |
286 | * objects can appear anywhere in the namespace by virtue of the AML | |
287 | * "Scope" operator. Thus, we need to track ownership by an ID, not | |
288 | * simply a position within the hierarchy | |
289 | */ | |
f3d2e786 | 290 | acpi_tb_delete_namespace_by_owner(i); |
ecb5f752 | 291 | status = acpi_tb_release_owner_id(i); |
f3d2e786 | 292 | acpi_tb_set_table_loaded_flag(i, FALSE); |
ecb5f752 | 293 | break; |
f3d2e786 BM |
294 | } |
295 | return_ACPI_STATUS(status); | |
0f0fe1a0 JK |
296 | } |
297 | ||
298 | ACPI_EXPORT_SYMBOL(acpi_unload_table_id) | |
299 | ||
1da177e4 LT |
300 | /******************************************************************************* |
301 | * | |
7d97277b | 302 | * FUNCTION: acpi_get_table_with_size |
1da177e4 | 303 | * |
ba494bee BM |
304 | * PARAMETERS: signature - ACPI signature of needed table |
305 | * instance - Which instance (for SSDTs) | |
f3d2e786 | 306 | * out_table - Where the pointer to the table is returned |
1da177e4 | 307 | * |
b7ed9a8e | 308 | * RETURN: Status and pointer to the requested table |
1da177e4 | 309 | * |
b7ed9a8e TC |
310 | * DESCRIPTION: Finds and verifies an ACPI table. Table must be in the |
311 | * RSDT/XSDT. | |
1da177e4 | 312 | * |
ec41f193 | 313 | ******************************************************************************/ |
f3d2e786 | 314 | acpi_status |
7d97277b YL |
315 | acpi_get_table_with_size(char *signature, |
316 | u32 instance, struct acpi_table_header **out_table, | |
317 | acpi_size *tbl_size) | |
1da177e4 | 318 | { |
67a119f9 BM |
319 | u32 i; |
320 | u32 j; | |
f3d2e786 | 321 | acpi_status status; |
1da177e4 | 322 | |
c5fc42ac BM |
323 | /* Parameter validation */ |
324 | ||
325 | if (!signature || !out_table) { | |
326 | return (AE_BAD_PARAMETER); | |
327 | } | |
328 | ||
ec41f193 BM |
329 | /* Walk the root table list */ |
330 | ||
b9ee2043 BM |
331 | for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count; |
332 | i++) { | |
f3d2e786 BM |
333 | if (!ACPI_COMPARE_NAME |
334 | (&(acpi_gbl_root_table_list.tables[i].signature), | |
335 | signature)) { | |
336 | continue; | |
337 | } | |
1da177e4 | 338 | |
f3d2e786 BM |
339 | if (++j < instance) { |
340 | continue; | |
341 | } | |
1da177e4 | 342 | |
f3d2e786 BM |
343 | status = |
344 | acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]); | |
345 | if (ACPI_SUCCESS(status)) { | |
346 | *out_table = acpi_gbl_root_table_list.tables[i].pointer; | |
7d97277b | 347 | *tbl_size = acpi_gbl_root_table_list.tables[i].length; |
f3d2e786 | 348 | } |
f6dd9221 | 349 | |
ad71860a | 350 | if (!acpi_gbl_permanent_mmap) { |
70c0846e | 351 | acpi_gbl_root_table_list.tables[i].pointer = NULL; |
ad71860a AS |
352 | } |
353 | ||
f3d2e786 | 354 | return (status); |
1da177e4 LT |
355 | } |
356 | ||
f3d2e786 | 357 | return (AE_NOT_FOUND); |
1da177e4 | 358 | } |
4f81f986 | 359 | ACPI_EXPORT_SYMBOL(acpi_get_table_with_size) |
1da177e4 | 360 | |
7d97277b YL |
361 | acpi_status |
362 | acpi_get_table(char *signature, | |
363 | u32 instance, struct acpi_table_header **out_table) | |
364 | { | |
365 | acpi_size tbl_size; | |
366 | ||
367 | return acpi_get_table_with_size(signature, | |
368 | instance, out_table, &tbl_size); | |
369 | } | |
f3d2e786 | 370 | ACPI_EXPORT_SYMBOL(acpi_get_table) |
8313524a | 371 | |
1da177e4 LT |
372 | /******************************************************************************* |
373 | * | |
f3d2e786 | 374 | * FUNCTION: acpi_get_table_by_index |
1da177e4 | 375 | * |
f3d2e786 | 376 | * PARAMETERS: table_index - Table index |
ba494bee | 377 | * table - Where the pointer to the table is returned |
1da177e4 | 378 | * |
b7ed9a8e | 379 | * RETURN: Status and pointer to the requested table |
1da177e4 | 380 | * |
b7ed9a8e TC |
381 | * DESCRIPTION: Obtain a table by an index into the global table list. Used |
382 | * internally also. | |
1da177e4 LT |
383 | * |
384 | ******************************************************************************/ | |
1da177e4 | 385 | acpi_status |
67a119f9 | 386 | acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table) |
1da177e4 | 387 | { |
4be44fcd | 388 | acpi_status status; |
1da177e4 | 389 | |
f3d2e786 | 390 | ACPI_FUNCTION_TRACE(acpi_get_table_by_index); |
1da177e4 | 391 | |
c5fc42ac BM |
392 | /* Parameter validation */ |
393 | ||
394 | if (!table) { | |
395 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
396 | } | |
397 | ||
f3d2e786 | 398 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); |
1da177e4 | 399 | |
f3d2e786 | 400 | /* Validate index */ |
1da177e4 | 401 | |
b9ee2043 | 402 | if (table_index >= acpi_gbl_root_table_list.current_table_count) { |
f3d2e786 | 403 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); |
4be44fcd | 404 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
405 | } |
406 | ||
f3d2e786 | 407 | if (!acpi_gbl_root_table_list.tables[table_index].pointer) { |
1da177e4 | 408 | |
f3d2e786 | 409 | /* Table is not mapped, map it */ |
1da177e4 | 410 | |
f3d2e786 BM |
411 | status = |
412 | acpi_tb_verify_table(&acpi_gbl_root_table_list. | |
413 | tables[table_index]); | |
414 | if (ACPI_FAILURE(status)) { | |
415 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
416 | return_ACPI_STATUS(status); | |
417 | } | |
1da177e4 LT |
418 | } |
419 | ||
f3d2e786 BM |
420 | *table = acpi_gbl_root_table_list.tables[table_index].pointer; |
421 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); | |
422 | return_ACPI_STATUS(AE_OK); | |
1da177e4 LT |
423 | } |
424 | ||
f3d2e786 | 425 | ACPI_EXPORT_SYMBOL(acpi_get_table_by_index) |
1da177e4 | 426 | |
67effe8f | 427 | |
3e08e2d2 LM |
428 | /******************************************************************************* |
429 | * | |
430 | * FUNCTION: acpi_install_table_handler | |
431 | * | |
ba494bee BM |
432 | * PARAMETERS: handler - Table event handler |
433 | * context - Value passed to the handler on each event | |
3e08e2d2 LM |
434 | * |
435 | * RETURN: Status | |
436 | * | |
b7ed9a8e | 437 | * DESCRIPTION: Install a global table event handler. |
3e08e2d2 LM |
438 | * |
439 | ******************************************************************************/ | |
440 | acpi_status | |
b43e1065 | 441 | acpi_install_table_handler(acpi_table_handler handler, void *context) |
3e08e2d2 LM |
442 | { |
443 | acpi_status status; | |
444 | ||
445 | ACPI_FUNCTION_TRACE(acpi_install_table_handler); | |
446 | ||
447 | if (!handler) { | |
448 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
449 | } | |
450 | ||
451 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); | |
452 | if (ACPI_FAILURE(status)) { | |
453 | return_ACPI_STATUS(status); | |
454 | } | |
455 | ||
456 | /* Don't allow more than one handler */ | |
457 | ||
458 | if (acpi_gbl_table_handler) { | |
459 | status = AE_ALREADY_EXISTS; | |
460 | goto cleanup; | |
461 | } | |
462 | ||
463 | /* Install the handler */ | |
464 | ||
465 | acpi_gbl_table_handler = handler; | |
466 | acpi_gbl_table_handler_context = context; | |
467 | ||
468 | cleanup: | |
469 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
470 | return_ACPI_STATUS(status); | |
471 | } | |
472 | ||
473 | ACPI_EXPORT_SYMBOL(acpi_install_table_handler) | |
474 | ||
475 | /******************************************************************************* | |
476 | * | |
477 | * FUNCTION: acpi_remove_table_handler | |
478 | * | |
ba494bee | 479 | * PARAMETERS: handler - Table event handler that was installed |
3e08e2d2 LM |
480 | * previously. |
481 | * | |
482 | * RETURN: Status | |
483 | * | |
b7ed9a8e | 484 | * DESCRIPTION: Remove a table event handler |
3e08e2d2 LM |
485 | * |
486 | ******************************************************************************/ | |
b43e1065 | 487 | acpi_status acpi_remove_table_handler(acpi_table_handler handler) |
3e08e2d2 LM |
488 | { |
489 | acpi_status status; | |
490 | ||
491 | ACPI_FUNCTION_TRACE(acpi_remove_table_handler); | |
492 | ||
493 | status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS); | |
494 | if (ACPI_FAILURE(status)) { | |
495 | return_ACPI_STATUS(status); | |
496 | } | |
497 | ||
498 | /* Make sure that the installed handler is the same */ | |
499 | ||
500 | if (!handler || handler != acpi_gbl_table_handler) { | |
501 | status = AE_BAD_PARAMETER; | |
502 | goto cleanup; | |
503 | } | |
504 | ||
505 | /* Remove the handler */ | |
506 | ||
507 | acpi_gbl_table_handler = NULL; | |
508 | ||
509 | cleanup: | |
510 | (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS); | |
511 | return_ACPI_STATUS(status); | |
512 | } | |
513 | ||
514 | ACPI_EXPORT_SYMBOL(acpi_remove_table_handler) |