1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB 2/* 3 * Copyright (c) 2017, Mellanox Technologies inc. All rights reserved. 4 */ 5#include <rdma/uverbs_ioctl.h> 6#include <rdma/rdma_user_ioctl.h> 7#include <linux/bitops.h> 8#include "rdma_core.h" 9#include "uverbs.h" 10 11static int ib_uverbs_notsupp(struct uverbs_attr_bundle *attrs) 12{ 13 return -EOPNOTSUPP; 14} 15 16static void *uapi_add_elm(struct uverbs_api *uapi, u32 key, size_t alloc_size) 17{ 18 void *elm; 19 int rc; 20 21 if (key == UVERBS_API_KEY_ERR) 22 return ERR_PTR(-EOVERFLOW); 23 24 elm = kzalloc(alloc_size, GFP_KERNEL); 25 if (!elm) 26 return ERR_PTR(-ENOMEM); 27 rc = radix_tree_insert(&uapi->radix, key, elm); 28 if (rc) { 29 kfree(elm); 30 return ERR_PTR(rc); 31 } 32 33 return elm; 34} 35 36static void *uapi_add_get_elm(struct uverbs_api *uapi, u32 key, 37 size_t alloc_size, bool *exists) 38{ 39 void *elm; 40 41 elm = uapi_add_elm(uapi, key, alloc_size); 42 if (!IS_ERR(elm)) { 43 *exists = false; 44 return elm; 45 } 46 47 if (elm != ERR_PTR(-EEXIST)) 48 return elm; 49 50 elm = radix_tree_lookup(&uapi->radix, key); 51 if (WARN_ON(!elm)) 52 return ERR_PTR(-EINVAL); 53 *exists = true; 54 return elm; 55} 56 57static int uapi_create_write(struct uverbs_api *uapi, 58 struct ib_device *ibdev, 59 const struct uapi_definition *def, 60 u32 obj_key, 61 u32 *cur_method_key) 62{ 63 struct uverbs_api_write_method *method_elm; 64 u32 method_key = obj_key; 65 bool exists; 66 67 if (def->write.is_ex) 68 method_key |= uapi_key_write_ex_method(def->write.command_num); 69 else 70 method_key |= uapi_key_write_method(def->write.command_num); 71 72 method_elm = uapi_add_get_elm(uapi, method_key, sizeof(*method_elm), 73 &exists); 74 if (IS_ERR(method_elm)) 75 return PTR_ERR(method_elm); 76 77 if (WARN_ON(exists && (def->write.is_ex != method_elm->is_ex))) 78 return -EINVAL; 79 80 method_elm->is_ex = def->write.is_ex; 81 method_elm->handler = def->func_write; 82 if (!def->write.is_ex) 83 method_elm->disabled = !(ibdev->uverbs_cmd_mask & 84 BIT_ULL(def->write.command_num)); 85 86 if (!def->write.is_ex && def->func_write) { 87 method_elm->has_udata = def->write.has_udata; 88 method_elm->has_resp = def->write.has_resp; 89 method_elm->req_size = def->write.req_size; 90 method_elm->resp_size = def->write.resp_size; 91 } 92 93 *cur_method_key = method_key; 94 return 0; 95} 96 97static int uapi_merge_method(struct uverbs_api *uapi, 98 struct uverbs_api_object *obj_elm, u32 obj_key, 99 const struct uverbs_method_def *method, 100 bool is_driver) 101{ 102 u32 method_key = obj_key | uapi_key_ioctl_method(method->id); 103 struct uverbs_api_ioctl_method *method_elm; 104 unsigned int i; 105 bool exists; 106 107 if (!method->attrs) 108 return 0; 109 110 method_elm = uapi_add_get_elm(uapi, method_key, sizeof(*method_elm), 111 &exists); 112 if (IS_ERR(method_elm)) 113 return PTR_ERR(method_elm); 114 if (exists) { 115 /* 116 * This occurs when a driver uses ADD_UVERBS_ATTRIBUTES_SIMPLE 117 */ 118 if (WARN_ON(method->handler)) 119 return -EINVAL; 120 } else { 121 WARN_ON(!method->handler); 122 rcu_assign_pointer(method_elm->handler, method->handler); 123 if (method->handler != uverbs_destroy_def_handler) 124 method_elm->driver_method = is_driver; 125 } 126 127 for (i = 0; i != method->num_attrs; i++) { 128 const struct uverbs_attr_def *attr = (*method->attrs)[i]; 129 struct uverbs_api_attr *attr_slot; 130 131 if (!attr) 132 continue; 133 134 /* 135 * ENUM_IN contains the 'ids' pointer to the driver's .rodata, 136 * so if it is specified by a driver then it always makes this 137 * into a driver method. 138 */ 139 if (attr->attr.type == UVERBS_ATTR_TYPE_ENUM_IN) 140 method_elm->driver_method |= is_driver; 141 142 /* 143 * Like other uobject based things we only support a single 144 * uobject being NEW'd or DESTROY'd 145 */ 146 if (attr->attr.type == UVERBS_ATTR_TYPE_IDRS_ARRAY) { 147 u8 access = attr->attr.u2.objs_arr.access; 148 149 if (WARN_ON(access == UVERBS_ACCESS_NEW || 150 access == UVERBS_ACCESS_DESTROY)) 151 return -EINVAL; 152 } 153 154 attr_slot = 155 uapi_add_elm(uapi, method_key | uapi_key_attr(attr->id), 156 sizeof(*attr_slot)); 157 /* Attributes are not allowed to be modified by drivers */ 158 if (IS_ERR(attr_slot)) 159 return PTR_ERR(attr_slot); 160 161 attr_slot->spec = attr->attr; 162 } 163 164 return 0; 165} 166 167static int uapi_merge_obj_tree(struct uverbs_api *uapi, 168 const struct uverbs_object_def *obj, 169 bool is_driver) 170{ 171 struct uverbs_api_object *obj_elm; 172 unsigned int i; 173 u32 obj_key; 174 bool exists; 175 int rc; 176 177 obj_key = uapi_key_obj(obj->id); 178 obj_elm = uapi_add_get_elm(uapi, obj_key, sizeof(*obj_elm), &exists); 179 if (IS_ERR(obj_elm)) 180 return PTR_ERR(obj_elm); 181 182 if (obj->type_attrs) { 183 if (WARN_ON(obj_elm->type_attrs)) 184 return -EINVAL; 185 186 obj_elm->id = obj->id; 187 obj_elm->type_attrs = obj->type_attrs; 188 obj_elm->type_class = obj->type_attrs->type_class; 189 /* 190 * Today drivers are only permitted to use idr_class and 191 * fd_class types. We can revoke the IDR types during 192 * disassociation, and the FD types require the driver to use 193 * struct file_operations.owner to prevent the driver module 194 * code from unloading while the file is open. This provides 195 * enough safety that uverbs_uobject_fd_release() will 196 * continue to work. Drivers using FD are responsible to 197 * handle disassociation of the device on their own. 198 */ 199 if (WARN_ON(is_driver && 200 obj->type_attrs->type_class != &uverbs_idr_class && 201 obj->type_attrs->type_class != &uverbs_fd_class)) 202 return -EINVAL; 203 } 204 205 if (!obj->methods) 206 return 0; 207 208 for (i = 0; i != obj->num_methods; i++) { 209 const struct uverbs_method_def *method = (*obj->methods)[i]; 210 211 if (!method) 212 continue; 213 214 rc = uapi_merge_method(uapi, obj_elm, obj_key, method, 215 is_driver); 216 if (rc) 217 return rc; 218 } 219 220 return 0; 221} 222 223static int uapi_disable_elm(struct uverbs_api *uapi, 224 const struct uapi_definition *def, 225 u32 obj_key, 226 u32 method_key) 227{ 228 bool exists; 229 230 if (def->scope == UAPI_SCOPE_OBJECT) { 231 struct uverbs_api_object *obj_elm; 232 233 obj_elm = uapi_add_get_elm( 234 uapi, obj_key, sizeof(*obj_elm), &exists); 235 if (IS_ERR(obj_elm)) 236 return PTR_ERR(obj_elm); 237 obj_elm->disabled = 1; 238 return 0; 239 } 240 241 if (def->scope == UAPI_SCOPE_METHOD && 242 uapi_key_is_ioctl_method(method_key)) { 243 struct uverbs_api_ioctl_method *method_elm; 244 245 method_elm = uapi_add_get_elm(uapi, method_key, 246 sizeof(*method_elm), &exists); 247 if (IS_ERR(method_elm)) 248 return PTR_ERR(method_elm); 249 method_elm->disabled = 1; 250 return 0; 251 } 252 253 if (def->scope == UAPI_SCOPE_METHOD && 254 (uapi_key_is_write_method(method_key) || 255 uapi_key_is_write_ex_method(method_key))) { 256 struct uverbs_api_write_method *write_elm; 257 258 write_elm = uapi_add_get_elm(uapi, method_key, 259 sizeof(*write_elm), &exists); 260 if (IS_ERR(write_elm)) 261 return PTR_ERR(write_elm); 262 write_elm->disabled = 1; 263 return 0; 264 } 265 266 WARN_ON(true); 267 return -EINVAL; 268} 269 270static int uapi_merge_def(struct uverbs_api *uapi, struct ib_device *ibdev, 271 const struct uapi_definition *def_list, 272 bool is_driver) 273{ 274 const struct uapi_definition *def = def_list; 275 u32 cur_obj_key = UVERBS_API_KEY_ERR; 276 u32 cur_method_key = UVERBS_API_KEY_ERR; 277 bool exists; 278 int rc; 279 280 if (!def_list) 281 return 0; 282 283 for (;; def++) { 284 switch ((enum uapi_definition_kind)def->kind) { 285 case UAPI_DEF_CHAIN: 286 rc = uapi_merge_def(uapi, ibdev, def->chain, is_driver); 287 if (rc) 288 return rc; 289 continue; 290 291 case UAPI_DEF_CHAIN_OBJ_TREE: 292 if (WARN_ON(def->object_start.object_id != 293 def->chain_obj_tree->id)) 294 return -EINVAL; 295 296 cur_obj_key = uapi_key_obj(def->object_start.object_id); 297 rc = uapi_merge_obj_tree(uapi, def->chain_obj_tree, 298 is_driver); 299 if (rc) 300 return rc; 301 continue; 302 303 case UAPI_DEF_END: 304 return 0; 305 306 case UAPI_DEF_IS_SUPPORTED_DEV_FN: { 307 void **ibdev_fn = 308 (void *)(&ibdev->ops) + def->needs_fn_offset; 309 310 if (*ibdev_fn) 311 continue; 312 rc = uapi_disable_elm( 313 uapi, def, cur_obj_key, cur_method_key); 314 if (rc) 315 return rc; 316 continue; 317 } 318 319 case UAPI_DEF_IS_SUPPORTED_FUNC: 320 if (def->func_is_supported(ibdev)) 321 continue; 322 rc = uapi_disable_elm( 323 uapi, def, cur_obj_key, cur_method_key); 324 if (rc) 325 return rc; 326 continue; 327 328 case UAPI_DEF_OBJECT_START: { 329 struct uverbs_api_object *obj_elm; 330 331 cur_obj_key = uapi_key_obj(def->object_start.object_id); 332 obj_elm = uapi_add_get_elm(uapi, cur_obj_key, 333 sizeof(*obj_elm), &exists); 334 if (IS_ERR(obj_elm)) 335 return PTR_ERR(obj_elm); 336 continue; 337 } 338 339 case UAPI_DEF_WRITE: 340 rc = uapi_create_write( 341 uapi, ibdev, def, cur_obj_key, &cur_method_key); 342 if (rc) 343 return rc; 344 continue; 345 } 346 WARN_ON(true); 347 return -EINVAL; 348 } 349} 350 351static int 352uapi_finalize_ioctl_method(struct uverbs_api *uapi, 353 struct uverbs_api_ioctl_method *method_elm, 354 u32 method_key) 355{ 356 struct radix_tree_iter iter; 357 unsigned int num_attrs = 0; 358 unsigned int max_bkey = 0; 359 bool single_uobj = false; 360 void __rcu **slot; 361 362 method_elm->destroy_bkey = UVERBS_API_ATTR_BKEY_LEN; 363 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 364 uapi_key_attrs_start(method_key)) { 365 struct uverbs_api_attr *elm = 366 rcu_dereference_protected(*slot, true); 367 u32 attr_key = iter.index & UVERBS_API_ATTR_KEY_MASK; 368 u32 attr_bkey = uapi_bkey_attr(attr_key); 369 u8 type = elm->spec.type; 370 371 if (uapi_key_attr_to_ioctl_method(iter.index) != 372 uapi_key_attr_to_ioctl_method(method_key)) 373 break; 374 375 if (elm->spec.mandatory) 376 __set_bit(attr_bkey, method_elm->attr_mandatory); 377 378 if (elm->spec.is_udata) 379 method_elm->has_udata = true; 380 381 if (type == UVERBS_ATTR_TYPE_IDR || 382 type == UVERBS_ATTR_TYPE_FD) { 383 u8 access = elm->spec.u.obj.access; 384 385 /* 386 * Verbs specs may only have one NEW/DESTROY, we don't 387 * have the infrastructure to abort multiple NEW's or 388 * cope with multiple DESTROY failure. 389 */ 390 if (access == UVERBS_ACCESS_NEW || 391 access == UVERBS_ACCESS_DESTROY) { 392 if (WARN_ON(single_uobj)) 393 return -EINVAL; 394 395 single_uobj = true; 396 if (WARN_ON(!elm->spec.mandatory)) 397 return -EINVAL; 398 } 399 400 if (access == UVERBS_ACCESS_DESTROY) 401 method_elm->destroy_bkey = attr_bkey; 402 } 403 404 max_bkey = max(max_bkey, attr_bkey); 405 num_attrs++; 406 } 407 408 method_elm->key_bitmap_len = max_bkey + 1; 409 WARN_ON(method_elm->key_bitmap_len > UVERBS_API_ATTR_BKEY_LEN); 410 411 uapi_compute_bundle_size(method_elm, num_attrs); 412 return 0; 413} 414 415static int uapi_finalize(struct uverbs_api *uapi) 416{ 417 const struct uverbs_api_write_method **data; 418 unsigned long max_write_ex = 0; 419 unsigned long max_write = 0; 420 struct radix_tree_iter iter; 421 void __rcu **slot; 422 int rc; 423 int i; 424 425 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) { 426 struct uverbs_api_ioctl_method *method_elm = 427 rcu_dereference_protected(*slot, true); 428 429 if (uapi_key_is_ioctl_method(iter.index)) { 430 rc = uapi_finalize_ioctl_method(uapi, method_elm, 431 iter.index); 432 if (rc) 433 return rc; 434 } 435 436 if (uapi_key_is_write_method(iter.index)) 437 max_write = max(max_write, 438 iter.index & UVERBS_API_ATTR_KEY_MASK); 439 if (uapi_key_is_write_ex_method(iter.index)) 440 max_write_ex = 441 max(max_write_ex, 442 iter.index & UVERBS_API_ATTR_KEY_MASK); 443 } 444 445 uapi->notsupp_method.handler = ib_uverbs_notsupp; 446 uapi->num_write = max_write + 1; 447 uapi->num_write_ex = max_write_ex + 1; 448 data = kmalloc_array(uapi->num_write + uapi->num_write_ex, 449 sizeof(*uapi->write_methods), GFP_KERNEL); 450 if (!data) 451 return -ENOMEM; 452 453 for (i = 0; i != uapi->num_write + uapi->num_write_ex; i++) 454 data[i] = &uapi->notsupp_method; 455 uapi->write_methods = data; 456 uapi->write_ex_methods = data + uapi->num_write; 457 458 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) { 459 if (uapi_key_is_write_method(iter.index)) 460 uapi->write_methods[iter.index & 461 UVERBS_API_ATTR_KEY_MASK] = 462 rcu_dereference_protected(*slot, true); 463 if (uapi_key_is_write_ex_method(iter.index)) 464 uapi->write_ex_methods[iter.index & 465 UVERBS_API_ATTR_KEY_MASK] = 466 rcu_dereference_protected(*slot, true); 467 } 468 469 return 0; 470} 471 472static void uapi_remove_range(struct uverbs_api *uapi, u32 start, u32 last) 473{ 474 struct radix_tree_iter iter; 475 void __rcu **slot; 476 477 radix_tree_for_each_slot (slot, &uapi->radix, &iter, start) { 478 if (iter.index > last) 479 return; 480 kfree(rcu_dereference_protected(*slot, true)); 481 radix_tree_iter_delete(&uapi->radix, &iter, slot); 482 } 483} 484 485static void uapi_remove_object(struct uverbs_api *uapi, u32 obj_key) 486{ 487 uapi_remove_range(uapi, obj_key, 488 obj_key | UVERBS_API_METHOD_KEY_MASK | 489 UVERBS_API_ATTR_KEY_MASK); 490} 491 492static void uapi_remove_method(struct uverbs_api *uapi, u32 method_key) 493{ 494 uapi_remove_range(uapi, method_key, 495 method_key | UVERBS_API_ATTR_KEY_MASK); 496} 497 498 499static u32 uapi_get_obj_id(struct uverbs_attr_spec *spec) 500{ 501 if (spec->type == UVERBS_ATTR_TYPE_IDR || 502 spec->type == UVERBS_ATTR_TYPE_FD) 503 return spec->u.obj.obj_type; 504 if (spec->type == UVERBS_ATTR_TYPE_IDRS_ARRAY) 505 return spec->u2.objs_arr.obj_type; 506 return UVERBS_API_KEY_ERR; 507} 508 509static void uapi_key_okay(u32 key) 510{ 511 unsigned int count = 0; 512 513 if (uapi_key_is_object(key)) 514 count++; 515 if (uapi_key_is_ioctl_method(key)) 516 count++; 517 if (uapi_key_is_write_method(key)) 518 count++; 519 if (uapi_key_is_write_ex_method(key)) 520 count++; 521 if (uapi_key_is_attr(key)) 522 count++; 523 WARN(count != 1, "Bad count %u key=%x", count, key); 524} 525 526static void uapi_finalize_disable(struct uverbs_api *uapi) 527{ 528 struct radix_tree_iter iter; 529 u32 starting_key = 0; 530 bool scan_again = false; 531 void __rcu **slot; 532 533again: 534 radix_tree_for_each_slot (slot, &uapi->radix, &iter, starting_key) { 535 uapi_key_okay(iter.index); 536 537 if (uapi_key_is_object(iter.index)) { 538 struct uverbs_api_object *obj_elm = 539 rcu_dereference_protected(*slot, true); 540 541 if (obj_elm->disabled) { 542 /* Have to check all the attrs again */ 543 scan_again = true; 544 starting_key = iter.index; 545 uapi_remove_object(uapi, iter.index); 546 goto again; 547 } 548 continue; 549 } 550 551 if (uapi_key_is_ioctl_method(iter.index)) { 552 struct uverbs_api_ioctl_method *method_elm = 553 rcu_dereference_protected(*slot, true); 554 555 if (method_elm->disabled) { 556 starting_key = iter.index; 557 uapi_remove_method(uapi, iter.index); 558 goto again; 559 } 560 continue; 561 } 562 563 if (uapi_key_is_write_method(iter.index) || 564 uapi_key_is_write_ex_method(iter.index)) { 565 struct uverbs_api_write_method *method_elm = 566 rcu_dereference_protected(*slot, true); 567 568 if (method_elm->disabled) { 569 kfree(method_elm); 570 radix_tree_iter_delete(&uapi->radix, &iter, slot); 571 } 572 continue; 573 } 574 575 if (uapi_key_is_attr(iter.index)) { 576 struct uverbs_api_attr *attr_elm = 577 rcu_dereference_protected(*slot, true); 578 const struct uverbs_api_object *tmp_obj; 579 u32 obj_key; 580 581 /* 582 * If the method has a mandatory object handle 583 * attribute which relies on an object which is not 584 * present then the entire method is uncallable. 585 */ 586 if (!attr_elm->spec.mandatory) 587 continue; 588 obj_key = uapi_get_obj_id(&attr_elm->spec); 589 if (obj_key == UVERBS_API_KEY_ERR) 590 continue; 591 tmp_obj = uapi_get_object(uapi, obj_key); 592 if (IS_ERR(tmp_obj)) { 593 if (PTR_ERR(tmp_obj) == -ENOMSG) 594 continue; 595 } else { 596 if (!tmp_obj->disabled) 597 continue; 598 } 599 600 starting_key = iter.index; 601 uapi_remove_method( 602 uapi, 603 iter.index & (UVERBS_API_OBJ_KEY_MASK | 604 UVERBS_API_METHOD_KEY_MASK)); 605 goto again; 606 } 607 608 WARN_ON(false); 609 } 610 611 if (!scan_again) 612 return; 613 scan_again = false; 614 starting_key = 0; 615 goto again; 616} 617 618void uverbs_destroy_api(struct uverbs_api *uapi) 619{ 620 if (!uapi) 621 return; 622 623 uapi_remove_range(uapi, 0, U32_MAX); 624 kfree(uapi->write_methods); 625 kfree(uapi); 626} 627 628static const struct uapi_definition uverbs_core_api[] = { 629 UAPI_DEF_CHAIN(uverbs_def_obj_async_fd), 630 UAPI_DEF_CHAIN(uverbs_def_obj_counters), 631 UAPI_DEF_CHAIN(uverbs_def_obj_cq), 632 UAPI_DEF_CHAIN(uverbs_def_obj_device), 633 UAPI_DEF_CHAIN(uverbs_def_obj_dm), 634 UAPI_DEF_CHAIN(uverbs_def_obj_flow_action), 635 UAPI_DEF_CHAIN(uverbs_def_obj_intf), 636 UAPI_DEF_CHAIN(uverbs_def_obj_mr), 637 UAPI_DEF_CHAIN(uverbs_def_obj_qp), 638 UAPI_DEF_CHAIN(uverbs_def_obj_srq), 639 UAPI_DEF_CHAIN(uverbs_def_obj_wq), 640 UAPI_DEF_CHAIN(uverbs_def_write_intf), 641 {}, 642}; 643 644struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev) 645{ 646 struct uverbs_api *uapi; 647 int rc; 648 649 uapi = kzalloc(sizeof(*uapi), GFP_KERNEL); 650 if (!uapi) 651 return ERR_PTR(-ENOMEM); 652 653 INIT_RADIX_TREE(&uapi->radix, GFP_KERNEL); 654 uapi->driver_id = ibdev->ops.driver_id; 655 656 rc = uapi_merge_def(uapi, ibdev, uverbs_core_api, false); 657 if (rc) 658 goto err; 659 rc = uapi_merge_def(uapi, ibdev, ibdev->driver_def, true); 660 if (rc) 661 goto err; 662 663 uapi_finalize_disable(uapi); 664 rc = uapi_finalize(uapi); 665 if (rc) 666 goto err; 667 668 return uapi; 669err: 670 if (rc != -ENOMEM) 671 dev_err(&ibdev->dev, 672 "Setup of uverbs_api failed, kernel parsing tree description is not valid (%d)??\n", 673 rc); 674 675 uverbs_destroy_api(uapi); 676 return ERR_PTR(rc); 677} 678 679/* 680 * The pre version is done before destroying the HW objects, it only blocks 681 * off method access. All methods that require the ib_dev or the module data 682 * must test one of these assignments prior to continuing. 683 */ 684void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev) 685{ 686 struct uverbs_api *uapi = uverbs_dev->uapi; 687 struct radix_tree_iter iter; 688 void __rcu **slot; 689 690 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 691 692 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) { 693 if (uapi_key_is_ioctl_method(iter.index)) { 694 struct uverbs_api_ioctl_method *method_elm = 695 rcu_dereference_protected(*slot, true); 696 697 if (method_elm->driver_method) 698 rcu_assign_pointer(method_elm->handler, NULL); 699 } 700 } 701 702 synchronize_srcu(&uverbs_dev->disassociate_srcu); 703} 704 705/* 706 * Called when a driver disassociates from the ib_uverbs_device. The 707 * assumption is that the driver module will unload after. Replace everything 708 * related to the driver with NULL as a safety measure. 709 */ 710void uverbs_disassociate_api(struct uverbs_api *uapi) 711{ 712 struct radix_tree_iter iter; 713 void __rcu **slot; 714 715 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) { 716 if (uapi_key_is_object(iter.index)) { 717 struct uverbs_api_object *object_elm = 718 rcu_dereference_protected(*slot, true); 719 720 /* 721 * Some type_attrs are in the driver module. We don't 722 * bother to keep track of which since there should be 723 * no use of this after disassociate. 724 */ 725 object_elm->type_attrs = NULL; 726 } else if (uapi_key_is_attr(iter.index)) { 727 struct uverbs_api_attr *elm = 728 rcu_dereference_protected(*slot, true); 729 730 if (elm->spec.type == UVERBS_ATTR_TYPE_ENUM_IN) 731 elm->spec.u2.enum_def.ids = NULL; 732 } 733 } 734} 735