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95857638 | 1 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
1da177e4 LT |
2 | /****************************************************************************** |
3 | * | |
4 | * Module Name: exconfig - Namespace reconfiguration (Load/Unload opcodes) | |
5 | * | |
da6f8320 | 6 | * Copyright (C) 2000 - 2018, Intel Corp. |
1da177e4 | 7 | * |
95857638 | 8 | *****************************************************************************/ |
1da177e4 | 9 | |
1da177e4 | 10 | #include <acpi/acpi.h> |
e2f7a777 LB |
11 | #include "accommon.h" |
12 | #include "acinterp.h" | |
13 | #include "acnamesp.h" | |
14 | #include "actables.h" | |
15 | #include "acdispat.h" | |
3c59f960 | 16 | #include "acevents.h" |
528a412c | 17 | #include "amlcode.h" |
1da177e4 | 18 | |
1da177e4 | 19 | #define _COMPONENT ACPI_EXECUTER |
4be44fcd | 20 | ACPI_MODULE_NAME("exconfig") |
1da177e4 | 21 | |
44f6c012 | 22 | /* Local prototypes */ |
44f6c012 | 23 | static acpi_status |
ac0f06eb | 24 | acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle); |
1da177e4 | 25 | |
3c59f960 BM |
26 | static acpi_status |
27 | acpi_ex_region_read(union acpi_operand_object *obj_desc, | |
28 | u32 length, u8 *buffer); | |
29 | ||
1da177e4 LT |
30 | /******************************************************************************* |
31 | * | |
32 | * FUNCTION: acpi_ex_add_table | |
33 | * | |
ba494bee | 34 | * PARAMETERS: table - Pointer to raw table |
1da177e4 LT |
35 | * parent_node - Where to load the table (scope) |
36 | * ddb_handle - Where to return the table handle. | |
37 | * | |
38 | * RETURN: Status | |
39 | * | |
40 | * DESCRIPTION: Common function to Install and Load an ACPI table with a | |
41 | * returned table handle. | |
42 | * | |
43 | ******************************************************************************/ | |
44 | ||
44f6c012 | 45 | static acpi_status |
ac0f06eb | 46 | acpi_ex_add_table(u32 table_index, union acpi_operand_object **ddb_handle) |
1da177e4 | 47 | { |
4be44fcd | 48 | union acpi_operand_object *obj_desc; |
1da177e4 | 49 | |
b229cf92 | 50 | ACPI_FUNCTION_TRACE(ex_add_table); |
1da177e4 LT |
51 | |
52 | /* Create an object to be the table handle */ | |
53 | ||
4be44fcd | 54 | obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); |
1da177e4 | 55 | if (!obj_desc) { |
4be44fcd | 56 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
57 | } |
58 | ||
0c9938cc RM |
59 | /* Init the table handle */ |
60 | ||
e0be6f5a | 61 | obj_desc->common.flags |= AOPOBJ_DATA_VALID; |
1044f1f6 | 62 | obj_desc->reference.class = ACPI_REFCLASS_TABLE; |
57e664cf | 63 | obj_desc->reference.value = table_index; |
ac0f06eb | 64 | *ddb_handle = obj_desc; |
186c307f | 65 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
66 | } |
67 | ||
1da177e4 LT |
68 | /******************************************************************************* |
69 | * | |
70 | * FUNCTION: acpi_ex_load_table_op | |
71 | * | |
72 | * PARAMETERS: walk_state - Current state with operands | |
73 | * return_desc - Where to store the return object | |
74 | * | |
75 | * RETURN: Status | |
76 | * | |
a6823e12 | 77 | * DESCRIPTION: Load an ACPI table from the RSDT/XSDT |
1da177e4 LT |
78 | * |
79 | ******************************************************************************/ | |
80 | ||
81 | acpi_status | |
4be44fcd LB |
82 | acpi_ex_load_table_op(struct acpi_walk_state *walk_state, |
83 | union acpi_operand_object **return_desc) | |
1da177e4 | 84 | { |
4be44fcd LB |
85 | acpi_status status; |
86 | union acpi_operand_object **operand = &walk_state->operands[0]; | |
4be44fcd LB |
87 | struct acpi_namespace_node *parent_node; |
88 | struct acpi_namespace_node *start_node; | |
89 | struct acpi_namespace_node *parameter_node = NULL; | |
90 | union acpi_operand_object *ddb_handle; | |
67a119f9 | 91 | u32 table_index; |
1da177e4 | 92 | |
b229cf92 | 93 | ACPI_FUNCTION_TRACE(ex_load_table_op); |
1da177e4 | 94 | |
a6823e12 | 95 | /* Find the ACPI table in the RSDT/XSDT */ |
1da177e4 | 96 | |
ac0f06eb | 97 | acpi_ex_exit_interpreter(); |
4be44fcd LB |
98 | status = acpi_tb_find_table(operand[0]->string.pointer, |
99 | operand[1]->string.pointer, | |
f3d2e786 | 100 | operand[2]->string.pointer, &table_index); |
ac0f06eb | 101 | acpi_ex_enter_interpreter(); |
4be44fcd | 102 | if (ACPI_FAILURE(status)) { |
1da177e4 | 103 | if (status != AE_NOT_FOUND) { |
4be44fcd | 104 | return_ACPI_STATUS(status); |
1da177e4 LT |
105 | } |
106 | ||
107 | /* Table not found, return an Integer=0 and AE_OK */ | |
108 | ||
dc95a270 | 109 | ddb_handle = acpi_ut_create_integer_object((u64) 0); |
1da177e4 | 110 | if (!ddb_handle) { |
4be44fcd | 111 | return_ACPI_STATUS(AE_NO_MEMORY); |
1da177e4 LT |
112 | } |
113 | ||
1da177e4 | 114 | *return_desc = ddb_handle; |
4be44fcd | 115 | return_ACPI_STATUS(AE_OK); |
1da177e4 LT |
116 | } |
117 | ||
118 | /* Default nodes */ | |
119 | ||
120 | start_node = walk_state->scope_info->scope.node; | |
121 | parent_node = acpi_gbl_root_node; | |
122 | ||
123 | /* root_path (optional parameter) */ | |
124 | ||
125 | if (operand[3]->string.length > 0) { | |
126 | /* | |
127 | * Find the node referenced by the root_path_string. This is the | |
128 | * location within the namespace where the table will be loaded. | |
129 | */ | |
74f51b80 LZ |
130 | status = acpi_ns_get_node_unlocked(start_node, |
131 | operand[3]->string.pointer, | |
132 | ACPI_NS_SEARCH_PARENT, | |
133 | &parent_node); | |
4be44fcd LB |
134 | if (ACPI_FAILURE(status)) { |
135 | return_ACPI_STATUS(status); | |
1da177e4 LT |
136 | } |
137 | } | |
138 | ||
139 | /* parameter_path (optional parameter) */ | |
140 | ||
141 | if (operand[4]->string.length > 0) { | |
528a412c BM |
142 | if ((operand[4]->string.pointer[0] != AML_ROOT_PREFIX) && |
143 | (operand[4]->string.pointer[0] != AML_PARENT_PREFIX)) { | |
1da177e4 LT |
144 | /* |
145 | * Path is not absolute, so it will be relative to the node | |
146 | * referenced by the root_path_string (or the NS root if omitted) | |
147 | */ | |
148 | start_node = parent_node; | |
149 | } | |
150 | ||
44f6c012 RM |
151 | /* Find the node referenced by the parameter_path_string */ |
152 | ||
74f51b80 LZ |
153 | status = acpi_ns_get_node_unlocked(start_node, |
154 | operand[4]->string.pointer, | |
155 | ACPI_NS_SEARCH_PARENT, | |
156 | ¶meter_node); | |
4be44fcd LB |
157 | if (ACPI_FAILURE(status)) { |
158 | return_ACPI_STATUS(status); | |
1da177e4 LT |
159 | } |
160 | } | |
161 | ||
162 | /* Load the table into the namespace */ | |
163 | ||
ac0f06eb LZ |
164 | ACPI_INFO(("Dynamic OEM Table Load:")); |
165 | acpi_ex_exit_interpreter(); | |
166 | status = acpi_tb_load_table(table_index, parent_node); | |
167 | acpi_ex_enter_interpreter(); | |
168 | if (ACPI_FAILURE(status)) { | |
169 | return_ACPI_STATUS(status); | |
170 | } | |
171 | ||
172 | status = acpi_ex_add_table(table_index, &ddb_handle); | |
4be44fcd LB |
173 | if (ACPI_FAILURE(status)) { |
174 | return_ACPI_STATUS(status); | |
1da177e4 LT |
175 | } |
176 | ||
7b34c0fb BM |
177 | /* Complete the initialization/resolution of package objects */ |
178 | ||
179 | status = acpi_ns_walk_namespace(ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT, | |
180 | ACPI_UINT32_MAX, 0, | |
181 | acpi_ns_init_one_package, NULL, NULL, | |
182 | NULL); | |
183 | ||
1da177e4 LT |
184 | /* Parameter Data (optional) */ |
185 | ||
186 | if (parameter_node) { | |
52fc0b02 | 187 | |
1da177e4 LT |
188 | /* Store the parameter data into the optional parameter object */ |
189 | ||
4be44fcd LB |
190 | status = acpi_ex_store(operand[5], |
191 | ACPI_CAST_PTR(union acpi_operand_object, | |
192 | parameter_node), | |
193 | walk_state); | |
194 | if (ACPI_FAILURE(status)) { | |
195 | (void)acpi_ex_unload_table(ddb_handle); | |
06366c14 LM |
196 | |
197 | acpi_ut_remove_reference(ddb_handle); | |
4be44fcd | 198 | return_ACPI_STATUS(status); |
1da177e4 LT |
199 | } |
200 | } | |
201 | ||
202 | *return_desc = ddb_handle; | |
4be44fcd | 203 | return_ACPI_STATUS(status); |
1da177e4 LT |
204 | } |
205 | ||
3c59f960 BM |
206 | /******************************************************************************* |
207 | * | |
208 | * FUNCTION: acpi_ex_region_read | |
209 | * | |
210 | * PARAMETERS: obj_desc - Region descriptor | |
ba494bee BM |
211 | * length - Number of bytes to read |
212 | * buffer - Pointer to where to put the data | |
3c59f960 BM |
213 | * |
214 | * RETURN: Status | |
215 | * | |
216 | * DESCRIPTION: Read data from an operation region. The read starts from the | |
217 | * beginning of the region. | |
218 | * | |
219 | ******************************************************************************/ | |
220 | ||
221 | static acpi_status | |
222 | acpi_ex_region_read(union acpi_operand_object *obj_desc, u32 length, u8 *buffer) | |
223 | { | |
224 | acpi_status status; | |
5df7e6cb | 225 | u64 value; |
f5407af3 | 226 | u32 region_offset = 0; |
3c59f960 BM |
227 | u32 i; |
228 | ||
3c59f960 BM |
229 | /* Bytewise reads */ |
230 | ||
231 | for (i = 0; i < length; i++) { | |
9ce81784 BM |
232 | status = |
233 | acpi_ev_address_space_dispatch(obj_desc, NULL, ACPI_READ, | |
234 | region_offset, 8, &value); | |
3c59f960 | 235 | if (ACPI_FAILURE(status)) { |
9c0d7939 | 236 | return (status); |
3c59f960 BM |
237 | } |
238 | ||
239 | *buffer = (u8)value; | |
240 | buffer++; | |
f5407af3 | 241 | region_offset++; |
3c59f960 BM |
242 | } |
243 | ||
9c0d7939 | 244 | return (AE_OK); |
3c59f960 BM |
245 | } |
246 | ||
1da177e4 LT |
247 | /******************************************************************************* |
248 | * | |
249 | * FUNCTION: acpi_ex_load_op | |
250 | * | |
a6823e12 | 251 | * PARAMETERS: obj_desc - Region or Buffer/Field where the table will be |
1da177e4 | 252 | * obtained |
ba494bee | 253 | * target - Where a handle to the table will be stored |
1da177e4 LT |
254 | * walk_state - Current state |
255 | * | |
256 | * RETURN: Status | |
257 | * | |
258 | * DESCRIPTION: Load an ACPI table from a field or operation region | |
259 | * | |
a6823e12 AS |
260 | * NOTE: Region Fields (Field, bank_field, index_fields) are resolved to buffer |
261 | * objects before this code is reached. | |
262 | * | |
263 | * If source is an operation region, it must refer to system_memory, as | |
264 | * per the ACPI specification. | |
265 | * | |
1da177e4 LT |
266 | ******************************************************************************/ |
267 | ||
268 | acpi_status | |
4be44fcd LB |
269 | acpi_ex_load_op(union acpi_operand_object *obj_desc, |
270 | union acpi_operand_object *target, | |
271 | struct acpi_walk_state *walk_state) | |
1da177e4 | 272 | { |
4be44fcd | 273 | union acpi_operand_object *ddb_handle; |
86dfc6f3 | 274 | struct acpi_table_header *table_header; |
f0e0da8a | 275 | struct acpi_table_header *table; |
67a119f9 | 276 | u32 table_index; |
a6823e12 | 277 | acpi_status status; |
98af37fb | 278 | u32 length; |
1da177e4 | 279 | |
b229cf92 | 280 | ACPI_FUNCTION_TRACE(ex_load_op); |
1da177e4 | 281 | |
a6823e12 AS |
282 | /* Source Object can be either an op_region or a Buffer/Field */ |
283 | ||
3371c19c | 284 | switch (obj_desc->common.type) { |
1da177e4 LT |
285 | case ACPI_TYPE_REGION: |
286 | ||
f0e0da8a DN |
287 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
288 | "Load table from Region %p\n", obj_desc)); | |
5eb69180 | 289 | |
a6823e12 AS |
290 | /* Region must be system_memory (from ACPI spec) */ |
291 | ||
292 | if (obj_desc->region.space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) { | |
293 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); | |
294 | } | |
295 | ||
1da177e4 | 296 | /* |
1fad8738 BM |
297 | * If the Region Address and Length have not been previously |
298 | * evaluated, evaluate them now and save the results. | |
1da177e4 LT |
299 | */ |
300 | if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) { | |
4be44fcd LB |
301 | status = acpi_ds_get_region_arguments(obj_desc); |
302 | if (ACPI_FAILURE(status)) { | |
303 | return_ACPI_STATUS(status); | |
1da177e4 LT |
304 | } |
305 | } | |
306 | ||
3c59f960 BM |
307 | /* Get the table header first so we can get the table length */ |
308 | ||
86dfc6f3 LZ |
309 | table_header = ACPI_ALLOCATE(sizeof(struct acpi_table_header)); |
310 | if (!table_header) { | |
f0e0da8a DN |
311 | return_ACPI_STATUS(AE_NO_MEMORY); |
312 | } | |
313 | ||
3c59f960 BM |
314 | status = |
315 | acpi_ex_region_read(obj_desc, | |
316 | sizeof(struct acpi_table_header), | |
86dfc6f3 LZ |
317 | ACPI_CAST_PTR(u8, table_header)); |
318 | length = table_header->length; | |
319 | ACPI_FREE(table_header); | |
3c59f960 BM |
320 | |
321 | if (ACPI_FAILURE(status)) { | |
322 | return_ACPI_STATUS(status); | |
323 | } | |
f0e0da8a DN |
324 | |
325 | /* Must have at least an ACPI table header */ | |
326 | ||
327 | if (length < sizeof(struct acpi_table_header)) { | |
328 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); | |
329 | } | |
330 | ||
331 | /* | |
3c59f960 BM |
332 | * The original implementation simply mapped the table, with no copy. |
333 | * However, the memory region is not guaranteed to remain stable and | |
334 | * we must copy the table to a local buffer. For example, the memory | |
335 | * region is corrupted after suspend on some machines. Dynamically | |
336 | * loaded tables are usually small, so this overhead is minimal. | |
337 | * | |
338 | * The latest implementation (5/2009) does not use a mapping at all. | |
339 | * We use the low-level operation region interface to read the table | |
340 | * instead of the obvious optimization of using a direct mapping. | |
341 | * This maintains a consistent use of operation regions across the | |
342 | * entire subsystem. This is important if additional processing must | |
343 | * be performed in the (possibly user-installed) operation region | |
344 | * handler. For example, acpi_exec and ASLTS depend on this. | |
5eb69180 | 345 | */ |
f0e0da8a DN |
346 | |
347 | /* Allocate a buffer for the table */ | |
348 | ||
86dfc6f3 LZ |
349 | table = ACPI_ALLOCATE(length); |
350 | if (!table) { | |
f0e0da8a DN |
351 | return_ACPI_STATUS(AE_NO_MEMORY); |
352 | } | |
353 | ||
3c59f960 | 354 | /* Read the entire table */ |
f0e0da8a | 355 | |
3c59f960 | 356 | status = acpi_ex_region_read(obj_desc, length, |
86dfc6f3 | 357 | ACPI_CAST_PTR(u8, table)); |
3c59f960 | 358 | if (ACPI_FAILURE(status)) { |
86dfc6f3 | 359 | ACPI_FREE(table); |
3c59f960 | 360 | return_ACPI_STATUS(status); |
f0e0da8a | 361 | } |
1da177e4 LT |
362 | break; |
363 | ||
a6823e12 | 364 | case ACPI_TYPE_BUFFER: /* Buffer or resolved region_field */ |
1da177e4 | 365 | |
a6823e12 | 366 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, |
f0e0da8a DN |
367 | "Load table from Buffer or Field %p\n", |
368 | obj_desc)); | |
98af37fb BM |
369 | |
370 | /* Must have at least an ACPI table header */ | |
371 | ||
f0e0da8a | 372 | if (obj_desc->buffer.length < sizeof(struct acpi_table_header)) { |
98af37fb BM |
373 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
374 | } | |
375 | ||
f0e0da8a | 376 | /* Get the actual table length from the table header */ |
98af37fb | 377 | |
86dfc6f3 | 378 | table_header = |
f0e0da8a DN |
379 | ACPI_CAST_PTR(struct acpi_table_header, |
380 | obj_desc->buffer.pointer); | |
86dfc6f3 | 381 | length = table_header->length; |
f0e0da8a DN |
382 | |
383 | /* Table cannot extend beyond the buffer */ | |
384 | ||
385 | if (length > obj_desc->buffer.length) { | |
386 | return_ACPI_STATUS(AE_AML_BUFFER_LIMIT); | |
387 | } | |
388 | if (length < sizeof(struct acpi_table_header)) { | |
389 | return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); | |
98af37fb BM |
390 | } |
391 | ||
5eb69180 | 392 | /* |
1fad8738 BM |
393 | * Copy the table from the buffer because the buffer could be |
394 | * modified or even deleted in the future | |
5eb69180 | 395 | */ |
86dfc6f3 LZ |
396 | table = ACPI_ALLOCATE(length); |
397 | if (!table) { | |
5eb69180 BM |
398 | return_ACPI_STATUS(AE_NO_MEMORY); |
399 | } | |
1da177e4 | 400 | |
4fa4616e | 401 | memcpy(table, table_header, length); |
1da177e4 LT |
402 | break; |
403 | ||
1da177e4 | 404 | default: |
1d1ea1b7 | 405 | |
4be44fcd | 406 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
407 | } |
408 | ||
f0e0da8a DN |
409 | /* Install the new table into the local data structures */ |
410 | ||
05fb04b5 | 411 | ACPI_INFO(("Dynamic OEM Table Load:")); |
ac0f06eb | 412 | acpi_ex_exit_interpreter(); |
42cc87a5 LZ |
413 | status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table), |
414 | ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, | |
415 | TRUE, &table_index); | |
ac0f06eb | 416 | acpi_ex_enter_interpreter(); |
f3d2e786 | 417 | if (ACPI_FAILURE(status)) { |
2147d3f0 BM |
418 | |
419 | /* Delete allocated table buffer */ | |
420 | ||
86dfc6f3 LZ |
421 | ACPI_FREE(table); |
422 | return_ACPI_STATUS(status); | |
423 | } | |
424 | ||
0bda3f2f BM |
425 | /* |
426 | * Add the table to the namespace. | |
427 | * | |
f0e0da8a | 428 | * Note: Load the table objects relative to the root of the namespace. |
0bda3f2f BM |
429 | * This appears to go against the ACPI specification, but we do it for |
430 | * compatibility with other ACPI implementations. | |
431 | */ | |
ac0f06eb | 432 | status = acpi_ex_add_table(table_index, &ddb_handle); |
4be44fcd | 433 | if (ACPI_FAILURE(status)) { |
52fc0b02 | 434 | |
88ac00f5 RM |
435 | /* On error, table_ptr was deallocated above */ |
436 | ||
4be44fcd | 437 | return_ACPI_STATUS(status); |
1da177e4 LT |
438 | } |
439 | ||
7b34c0fb BM |
440 | /* Complete the initialization/resolution of package objects */ |
441 | ||
442 | status = acpi_ns_walk_namespace(ACPI_TYPE_PACKAGE, ACPI_ROOT_OBJECT, | |
443 | ACPI_UINT32_MAX, 0, | |
444 | acpi_ns_init_one_package, NULL, NULL, | |
445 | NULL); | |
446 | ||
1da177e4 LT |
447 | /* Store the ddb_handle into the Target operand */ |
448 | ||
4be44fcd LB |
449 | status = acpi_ex_store(ddb_handle, target, walk_state); |
450 | if (ACPI_FAILURE(status)) { | |
451 | (void)acpi_ex_unload_table(ddb_handle); | |
1da177e4 | 452 | |
88ac00f5 | 453 | /* table_ptr was deallocated above */ |
1da177e4 | 454 | |
a13b8460 | 455 | acpi_ut_remove_reference(ddb_handle); |
4be44fcd | 456 | return_ACPI_STATUS(status); |
88ac00f5 | 457 | } |
1da177e4 | 458 | |
06366c14 LM |
459 | /* Remove the reference by added by acpi_ex_store above */ |
460 | ||
461 | acpi_ut_remove_reference(ddb_handle); | |
4be44fcd | 462 | return_ACPI_STATUS(status); |
1da177e4 LT |
463 | } |
464 | ||
1da177e4 LT |
465 | /******************************************************************************* |
466 | * | |
467 | * FUNCTION: acpi_ex_unload_table | |
468 | * | |
469 | * PARAMETERS: ddb_handle - Handle to a previously loaded table | |
470 | * | |
471 | * RETURN: Status | |
472 | * | |
473 | * DESCRIPTION: Unload an ACPI table | |
474 | * | |
475 | ******************************************************************************/ | |
476 | ||
4be44fcd | 477 | acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle) |
1da177e4 | 478 | { |
4be44fcd LB |
479 | acpi_status status = AE_OK; |
480 | union acpi_operand_object *table_desc = ddb_handle; | |
67a119f9 | 481 | u32 table_index; |
1da177e4 | 482 | |
b229cf92 | 483 | ACPI_FUNCTION_TRACE(ex_unload_table); |
1da177e4 | 484 | |
43d1a62d BM |
485 | /* |
486 | * Temporarily emit a warning so that the ASL for the machine can be | |
487 | * hopefully obtained. This is to say that the Unload() operator is | |
488 | * extremely rare if not completely unused. | |
489 | */ | |
490 | ACPI_WARNING((AE_INFO, "Received request to unload an ACPI table")); | |
491 | ||
1da177e4 LT |
492 | /* |
493 | * Validate the handle | |
e0be6f5a | 494 | * Although the handle is partially validated in acpi_ex_reconfiguration() |
1da177e4 LT |
495 | * when it calls acpi_ex_resolve_operands(), the handle is more completely |
496 | * validated here. | |
e0be6f5a LM |
497 | * |
498 | * Handle must be a valid operand object of type reference. Also, the | |
499 | * ddb_handle must still be marked valid (table has not been previously | |
500 | * unloaded) | |
1da177e4 LT |
501 | */ |
502 | if ((!ddb_handle) || | |
4be44fcd | 503 | (ACPI_GET_DESCRIPTOR_TYPE(ddb_handle) != ACPI_DESC_TYPE_OPERAND) || |
e0be6f5a LM |
504 | (ddb_handle->common.type != ACPI_TYPE_LOCAL_REFERENCE) || |
505 | (!(ddb_handle->common.flags & AOPOBJ_DATA_VALID))) { | |
f6f57f60 | 506 | return_ACPI_STATUS(AE_AML_OPERAND_TYPE); |
1da177e4 LT |
507 | } |
508 | ||
57e664cf | 509 | /* Get the table index from the ddb_handle */ |
1da177e4 | 510 | |
57e664cf | 511 | table_index = table_desc->reference.value; |
1da177e4 | 512 | |
9febcdc0 LZ |
513 | /* |
514 | * Release the interpreter lock so that the table lock won't have | |
515 | * strict order requirement against it. | |
516 | */ | |
517 | acpi_ex_exit_interpreter(); | |
170564d9 | 518 | status = acpi_tb_unload_table(table_index); |
9febcdc0 LZ |
519 | acpi_ex_enter_interpreter(); |
520 | ||
e0be6f5a LM |
521 | /* |
522 | * Invalidate the handle. We do this because the handle may be stored | |
523 | * in a named object and may not be actually deleted until much later. | |
524 | */ | |
9febcdc0 LZ |
525 | if (ACPI_SUCCESS(status)) { |
526 | ddb_handle->common.flags &= ~AOPOBJ_DATA_VALID; | |
527 | } | |
528 | return_ACPI_STATUS(status); | |
1da177e4 | 529 | } |