drivers/firewire/core-device.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Device probing and sysfs code.
   4  *
   5  * Copyright (C) 2005-2006  Kristian Hoegsberg <krh@bitplanet.net>
   6  */
   7
   8 #include <linux/bug.h>
   9 #include <linux/ctype.h>
  10 #include <linux/delay.h>
  11 #include <linux/device.h>
  12 #include <linux/errno.h>
  13 #include <linux/firewire.h>
  14 #include <linux/firewire-constants.h>
  15 #include <linux/idr.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/kobject.h>
  18 #include <linux/list.h>
  19 #include <linux/mod_devicetable.h>
  20 #include <linux/module.h>
  21 #include <linux/mutex.h>
  22 #include <linux/random.h>
  23 #include <linux/rwsem.h>
  24 #include <linux/slab.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/string.h>
  27 #include <linux/workqueue.h>
  28
  29 #include <linux/atomic.h>
  30 #include <asm/byteorder.h>
  31
  32 #include "core.h"
  33
  34 #define ROOT_DIR_OFFSET 5
  35
  36 void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p)
  37 {
  38         ci->p = p + 1;
  39         ci->end = ci->p + (p[0] >> 16);
  40 }
  41 EXPORT_SYMBOL(fw_csr_iterator_init);
  42
  43 int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
  44 {
  45         *key = *ci->p >> 24;
  46         *value = *ci->p & 0xffffff;
  47
  48         return ci->p++ < ci->end;
  49 }
  50 EXPORT_SYMBOL(fw_csr_iterator_next);
  51
  52 static const u32 *search_directory(const u32 *directory, int search_key)
  53 {
  54         struct fw_csr_iterator ci;
  55         int key, value;
  56
  57         search_key |= CSR_DIRECTORY;
  58
  59         fw_csr_iterator_init(&ci, directory);
  60         while (fw_csr_iterator_next(&ci, &key, &value)) {
  61                 if (key == search_key)
  62                         return ci.p - 1 + value;
  63         }
  64
  65         return NULL;
  66 }
  67
  68 static const u32 *search_leaf(const u32 *directory, int search_key)
  69 {
  70         struct fw_csr_iterator ci;
  71         int last_key = 0, key, value;
  72
  73         fw_csr_iterator_init(&ci, directory);
  74         while (fw_csr_iterator_next(&ci, &key, &value)) {
  75                 if (last_key == search_key &&
  76                     key == (CSR_DESCRIPTOR | CSR_LEAF))
  77                         return ci.p - 1 + value;
  78
  79                 last_key = key;
  80         }
  81
  82         return NULL;
  83 }
  84
  85 static int textual_leaf_to_string(const u32 *block, char *buf, size_t size)
  86 {
  87         unsigned int quadlets, i;
  88         char c;
  89
  90         if (!size || !buf)
  91                 return -EINVAL;
  92
  93         quadlets = min(block[0] >> 16, 256U);
  94         if (quadlets < 2)
  95                 return -ENODATA;
  96
  97         if (block[1] != 0 || block[2] != 0)
  98                 /* unknown language/character set */
  99                 return -ENODATA;
 100
 101         block += 3;
 102         quadlets -= 2;
 103         for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
 104                 c = block[i / 4] >> (24 - 8 * (i % 4));
 105                 if (c == '\0')
 106                         break;
 107                 buf[i] = c;
 108         }
 109         buf[i] = '\0';
 110
 111         return i;
 112 }
 113
 114 /**
 115  * fw_csr_string() - reads a string from the configuration ROM
 116  * @directory:  e.g. root directory or unit directory
 117  * @key:        the key of the preceding directory entry
 118  * @buf:        where to put the string
 119  * @size:       size of @buf, in bytes
 120  *
 121  * The string is taken from a minimal ASCII text descriptor leaf after
 122  * the immediate entry with @key.  The string is zero-terminated.
 123  * An overlong string is silently truncated such that it and the
 124  * zero byte fit into @size.
 125  *
 126  * Returns strlen(buf) or a negative error code.
 127  */
 128 int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
 129 {
 130         const u32 *leaf = search_leaf(directory, key);
 131         if (!leaf)
 132                 return -ENOENT;
 133
 134         return textual_leaf_to_string(leaf, buf, size);
 135 }
 136 EXPORT_SYMBOL(fw_csr_string);
 137
 138 static void get_ids(const u32 *directory, int *id)
 139 {
 140         struct fw_csr_iterator ci;
 141         int key, value;
 142
 143         fw_csr_iterator_init(&ci, directory);
 144         while (fw_csr_iterator_next(&ci, &key, &value)) {
 145                 switch (key) {
 146                 case CSR_VENDOR:        id[0] = value; break;
 147                 case CSR_MODEL:         id[1] = value; break;
 148                 case CSR_SPECIFIER_ID:  id[2] = value; break;
 149                 case CSR_VERSION:       id[3] = value; break;
 150                 }
 151         }
 152 }
 153
 154 static void get_modalias_ids(const struct fw_unit *unit, int *id)
 155 {
 156         const u32 *root_directory = &fw_parent_device(unit)->config_rom[ROOT_DIR_OFFSET];
 157         const u32 *directories[] = {NULL, NULL, NULL};
 158         const u32 *vendor_directory;
 159         int i;
 160
 161         directories[0] = root_directory;
 162
 163         // Legacy layout of configuration ROM described in Annex 1 of 'Configuration ROM for AV/C
 164         // Devices 1.0 (December 12, 2000, 1394 Trading Association, TA Document 1999027)'.
 165         vendor_directory = search_directory(root_directory, CSR_VENDOR);
 166         if (!vendor_directory) {
 167                 directories[1] = unit->directory;
 168         } else {
 169                 directories[1] = vendor_directory;
 170                 directories[2] = unit->directory;
 171         }
 172
 173         for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i)
 174                 get_ids(directories[i], id);
 175 }
 176
 177 static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
 178 {
 179         int match = 0;
 180
 181         if (id[0] == id_table->vendor_id)
 182                 match |= IEEE1394_MATCH_VENDOR_ID;
 183         if (id[1] == id_table->model_id)
 184                 match |= IEEE1394_MATCH_MODEL_ID;
 185         if (id[2] == id_table->specifier_id)
 186                 match |= IEEE1394_MATCH_SPECIFIER_ID;
 187         if (id[3] == id_table->version)
 188                 match |= IEEE1394_MATCH_VERSION;
 189
 190         return (match & id_table->match_flags) == id_table->match_flags;
 191 }
 192
 193 static const struct ieee1394_device_id *unit_match(struct device *dev,
 194                                                    struct device_driver *drv)
 195 {
 196         const struct ieee1394_device_id *id_table =
 197                         container_of(drv, struct fw_driver, driver)->id_table;
 198         int id[] = {0, 0, 0, 0};
 199
 200         get_modalias_ids(fw_unit(dev), id);
 201
 202         for (; id_table->match_flags != 0; id_table++)
 203                 if (match_ids(id_table, id))
 204                         return id_table;
 205
 206         return NULL;
 207 }
 208
 209 static bool is_fw_unit(const struct device *dev);
 210
 211 static int fw_unit_match(struct device *dev, struct device_driver *drv)
 212 {
 213         /* We only allow binding to fw_units. */
 214         return is_fw_unit(dev) && unit_match(dev, drv) != NULL;
 215 }
 216
 217 static int fw_unit_probe(struct device *dev)
 218 {
 219         struct fw_driver *driver =
 220                         container_of(dev->driver, struct fw_driver, driver);
 221
 222         return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));
 223 }
 224
 225 static void fw_unit_remove(struct device *dev)
 226 {
 227         struct fw_driver *driver =
 228                         container_of(dev->driver, struct fw_driver, driver);
 229
 230         driver->remove(fw_unit(dev));
 231 }
 232
 233 static int get_modalias(const struct fw_unit *unit, char *buffer, size_t buffer_size)
 234 {
 235         int id[] = {0, 0, 0, 0};
 236
 237         get_modalias_ids(unit, id);
 238
 239         return snprintf(buffer, buffer_size,
 240                         "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
 241                         id[0], id[1], id[2], id[3]);
 242 }
 243
 244 static int fw_unit_uevent(const struct device *dev, struct kobj_uevent_env *env)
 245 {
 246         const struct fw_unit *unit = fw_unit(dev);
 247         char modalias[64];
 248
 249         get_modalias(unit, modalias, sizeof(modalias));
 250
 251         if (add_uevent_var(env, "MODALIAS=%s", modalias))
 252                 return -ENOMEM;
 253
 254         return 0;
 255 }
 256
 257 const struct bus_type fw_bus_type = {
 258         .name = "firewire",
 259         .match = fw_unit_match,
 260         .probe = fw_unit_probe,
 261         .remove = fw_unit_remove,
 262 };
 263 EXPORT_SYMBOL(fw_bus_type);
 264
 265 int fw_device_enable_phys_dma(struct fw_device *device)
 266 {
 267         int generation = device->generation;
 268
 269         /* device->node_id, accessed below, must not be older than generation */
 270         smp_rmb();
 271
 272         return device->card->driver->enable_phys_dma(device->card,
 273                                                      device->node_id,
 274                                                      generation);
 275 }
 276 EXPORT_SYMBOL(fw_device_enable_phys_dma);
 277
 278 struct config_rom_attribute {
 279         struct device_attribute attr;
 280         u32 key;
 281 };
 282
 283 static ssize_t show_immediate(struct device *dev,
 284                               struct device_attribute *dattr, char *buf)
 285 {
 286         struct config_rom_attribute *attr =
 287                 container_of(dattr, struct config_rom_attribute, attr);
 288         struct fw_csr_iterator ci;
 289         const u32 *directories[] = {NULL, NULL};
 290         int i, value = -1;
 291
 292         down_read(&fw_device_rwsem);
 293
 294         if (is_fw_unit(dev)) {
 295                 directories[0] = fw_unit(dev)->directory;
 296         } else {
 297                 const u32 *root_directory = fw_device(dev)->config_rom + ROOT_DIR_OFFSET;
 298                 const u32 *vendor_directory = search_directory(root_directory, CSR_VENDOR);
 299
 300                 if (!vendor_directory) {
 301                         directories[0] = root_directory;
 302                 } else {
 303                         // Legacy layout of configuration ROM described in Annex 1 of
 304                         // 'Configuration ROM for AV/C Devices 1.0 (December 12, 2000, 1394 Trading
 305                         // Association, TA Document 1999027)'.
 306                         directories[0] = vendor_directory;
 307                         directories[1] = root_directory;
 308                 }
 309         }
 310
 311         for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i) {
 312                 int key, val;
 313
 314                 fw_csr_iterator_init(&ci, directories[i]);
 315                 while (fw_csr_iterator_next(&ci, &key, &val)) {
 316                         if (attr->key == key)
 317                                 value = val;
 318                 }
 319         }
 320
 321         up_read(&fw_device_rwsem);
 322
 323         if (value < 0)
 324                 return -ENOENT;
 325
 326         return snprintf(buf, buf ? PAGE_SIZE : 0, "0x%06x\n", value);
 327 }
 328
 329 #define IMMEDIATE_ATTR(name, key)                               \
 330         { __ATTR(name, S_IRUGO, show_immediate, NULL), key }
 331
 332 static ssize_t show_text_leaf(struct device *dev,
 333                               struct device_attribute *dattr, char *buf)
 334 {
 335         struct config_rom_attribute *attr =
 336                 container_of(dattr, struct config_rom_attribute, attr);
 337         const u32 *directories[] = {NULL, NULL};
 338         size_t bufsize;
 339         char dummy_buf[2];
 340         int i, ret = -ENOENT;
 341
 342         down_read(&fw_device_rwsem);
 343
 344         if (is_fw_unit(dev)) {
 345                 directories[0] = fw_unit(dev)->directory;
 346         } else {
 347                 const u32 *root_directory = fw_device(dev)->config_rom + ROOT_DIR_OFFSET;
 348                 const u32 *vendor_directory = search_directory(root_directory, CSR_VENDOR);
 349
 350                 if (!vendor_directory) {
 351                         directories[0] = root_directory;
 352                 } else {
 353                         // Legacy layout of configuration ROM described in Annex 1 of
 354                         // 'Configuration ROM for AV/C Devices 1.0 (December 12, 2000, 1394
 355                         // Trading Association, TA Document 1999027)'.
 356                         directories[0] = root_directory;
 357                         directories[1] = vendor_directory;
 358                 }
 359         }
 360
 361         if (buf) {
 362                 bufsize = PAGE_SIZE - 1;
 363         } else {
 364                 buf = dummy_buf;
 365                 bufsize = 1;
 366         }
 367
 368         for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i) {
 369                 int result = fw_csr_string(directories[i], attr->key, buf, bufsize);
 370                 // Detected.
 371                 if (result >= 0)
 372                         ret = result;
 373         }
 374
 375         if (ret >= 0) {
 376                 /* Strip trailing whitespace and add newline. */
 377                 while (ret > 0 && isspace(buf[ret - 1]))
 378                         ret--;
 379                 strcpy(buf + ret, "\n");
 380                 ret++;
 381         }
 382
 383         up_read(&fw_device_rwsem);
 384
 385         return ret;
 386 }
 387
 388 #define TEXT_LEAF_ATTR(name, key)                               \
 389         { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
 390
 391 static struct config_rom_attribute config_rom_attributes[] = {
 392         IMMEDIATE_ATTR(vendor, CSR_VENDOR),
 393         IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
 394         IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
 395         IMMEDIATE_ATTR(version, CSR_VERSION),
 396         IMMEDIATE_ATTR(model, CSR_MODEL),
 397         TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
 398         TEXT_LEAF_ATTR(model_name, CSR_MODEL),
 399         TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
 400 };
 401
 402 static void init_fw_attribute_group(struct device *dev,
 403                                     struct device_attribute *attrs,
 404                                     struct fw_attribute_group *group)
 405 {
 406         struct device_attribute *attr;
 407         int i, j;
 408
 409         for (j = 0; attrs[j].attr.name != NULL; j++)
 410                 group->attrs[j] = &attrs[j].attr;
 411
 412         for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
 413                 attr = &config_rom_attributes[i].attr;
 414                 if (attr->show(dev, attr, NULL) < 0)
 415                         continue;
 416                 group->attrs[j++] = &attr->attr;
 417         }
 418
 419         group->attrs[j] = NULL;
 420         group->groups[0] = &group->group;
 421         group->groups[1] = NULL;
 422         group->group.attrs = group->attrs;
 423         dev->groups = (const struct attribute_group **) group->groups;
 424 }
 425
 426 static ssize_t modalias_show(struct device *dev,
 427                              struct device_attribute *attr, char *buf)
 428 {
 429         struct fw_unit *unit = fw_unit(dev);
 430         int length;
 431
 432         length = get_modalias(unit, buf, PAGE_SIZE);
 433         strcpy(buf + length, "\n");
 434
 435         return length + 1;
 436 }
 437
 438 static ssize_t rom_index_show(struct device *dev,
 439                               struct device_attribute *attr, char *buf)
 440 {
 441         struct fw_device *device = fw_device(dev->parent);
 442         struct fw_unit *unit = fw_unit(dev);
 443
 444         return sysfs_emit(buf, "%td\n", unit->directory - device->config_rom);
 445 }
 446
 447 static struct device_attribute fw_unit_attributes[] = {
 448         __ATTR_RO(modalias),
 449         __ATTR_RO(rom_index),
 450         __ATTR_NULL,
 451 };
 452
 453 static ssize_t config_rom_show(struct device *dev,
 454                                struct device_attribute *attr, char *buf)
 455 {
 456         struct fw_device *device = fw_device(dev);
 457         size_t length;
 458
 459         down_read(&fw_device_rwsem);
 460         length = device->config_rom_length * 4;
 461         memcpy(buf, device->config_rom, length);
 462         up_read(&fw_device_rwsem);
 463
 464         return length;
 465 }
 466
 467 static ssize_t guid_show(struct device *dev,
 468                          struct device_attribute *attr, char *buf)
 469 {
 470         struct fw_device *device = fw_device(dev);
 471         int ret;
 472
 473         down_read(&fw_device_rwsem);
 474         ret = sysfs_emit(buf, "0x%08x%08x\n", device->config_rom[3], device->config_rom[4]);
 475         up_read(&fw_device_rwsem);
 476
 477         return ret;
 478 }
 479
 480 static ssize_t is_local_show(struct device *dev,
 481                              struct device_attribute *attr, char *buf)
 482 {
 483         struct fw_device *device = fw_device(dev);
 484
 485         return sprintf(buf, "%u\n", device->is_local);
 486 }
 487
 488 static int units_sprintf(char *buf, const u32 *directory)
 489 {
 490         struct fw_csr_iterator ci;
 491         int key, value;
 492         int specifier_id = 0;
 493         int version = 0;
 494
 495         fw_csr_iterator_init(&ci, directory);
 496         while (fw_csr_iterator_next(&ci, &key, &value)) {
 497                 switch (key) {
 498                 case CSR_SPECIFIER_ID:
 499                         specifier_id = value;
 500                         break;
 501                 case CSR_VERSION:
 502                         version = value;
 503                         break;
 504                 }
 505         }
 506
 507         return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
 508 }
 509
 510 static ssize_t units_show(struct device *dev,
 511                           struct device_attribute *attr, char *buf)
 512 {
 513         struct fw_device *device = fw_device(dev);
 514         struct fw_csr_iterator ci;
 515         int key, value, i = 0;
 516
 517         down_read(&fw_device_rwsem);
 518         fw_csr_iterator_init(&ci, &device->config_rom[ROOT_DIR_OFFSET]);
 519         while (fw_csr_iterator_next(&ci, &key, &value)) {
 520                 if (key != (CSR_UNIT | CSR_DIRECTORY))
 521                         continue;
 522                 i += units_sprintf(&buf[i], ci.p + value - 1);
 523                 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
 524                         break;
 525         }
 526         up_read(&fw_device_rwsem);
 527
 528         if (i)
 529                 buf[i - 1] = '\n';
 530
 531         return i;
 532 }
 533
 534 static struct device_attribute fw_device_attributes[] = {
 535         __ATTR_RO(config_rom),
 536         __ATTR_RO(guid),
 537         __ATTR_RO(is_local),
 538         __ATTR_RO(units),
 539         __ATTR_NULL,
 540 };
 541
 542 static int read_rom(struct fw_device *device,
 543                     int generation, int index, u32 *data)
 544 {
 545         u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
 546         int i, rcode;
 547
 548         /* device->node_id, accessed below, must not be older than generation */
 549         smp_rmb();
 550
 551         for (i = 10; i < 100; i += 10) {
 552                 rcode = fw_run_transaction(device->card,
 553                                 TCODE_READ_QUADLET_REQUEST, device->node_id,
 554                                 generation, device->max_speed, offset, data, 4);
 555                 if (rcode != RCODE_BUSY)
 556                         break;
 557                 msleep(i);
 558         }
 559         be32_to_cpus(data);
 560
 561         return rcode;
 562 }
 563
 564 #define MAX_CONFIG_ROM_SIZE 256
 565
 566 /*
 567  * Read the bus info block, perform a speed probe, and read all of the rest of
 568  * the config ROM.  We do all this with a cached bus generation.  If the bus
 569  * generation changes under us, read_config_rom will fail and get retried.
 570  * It's better to start all over in this case because the node from which we
 571  * are reading the ROM may have changed the ROM during the reset.
 572  * Returns either a result code or a negative error code.
 573  */
 574 static int read_config_rom(struct fw_device *device, int generation)
 575 {
 576         struct fw_card *card = device->card;
 577         const u32 *old_rom, *new_rom;
 578         u32 *rom, *stack;
 579         u32 sp, key;
 580         int i, end, length, ret;
 581
 582         rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
 583                       sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
 584         if (rom == NULL)
 585                 return -ENOMEM;
 586
 587         stack = &rom[MAX_CONFIG_ROM_SIZE];
 588         memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
 589
 590         device->max_speed = SCODE_100;
 591
 592         /* First read the bus info block. */
 593         for (i = 0; i < 5; i++) {
 594                 ret = read_rom(device, generation, i, &rom[i]);
 595                 if (ret != RCODE_COMPLETE)
 596                         goto out;
 597                 /*
 598                  * As per IEEE1212 7.2, during initialization, devices can
 599                  * reply with a 0 for the first quadlet of the config
 600                  * rom to indicate that they are booting (for example,
 601                  * if the firmware is on the disk of a external
 602                  * harddisk).  In that case we just fail, and the
 603                  * retry mechanism will try again later.
 604                  */
 605                 if (i == 0 && rom[i] == 0) {
 606                         ret = RCODE_BUSY;
 607                         goto out;
 608                 }
 609         }
 610
 611         device->max_speed = device->node->max_speed;
 612
 613         /*
 614          * Determine the speed of
 615          *   - devices with link speed less than PHY speed,
 616          *   - devices with 1394b PHY (unless only connected to 1394a PHYs),
 617          *   - all devices if there are 1394b repeaters.
 618          * Note, we cannot use the bus info block's link_spd as starting point
 619          * because some buggy firmwares set it lower than necessary and because
 620          * 1394-1995 nodes do not have the field.
 621          */
 622         if ((rom[2] & 0x7) < device->max_speed ||
 623             device->max_speed == SCODE_BETA ||
 624             card->beta_repeaters_present) {
 625                 u32 dummy;
 626
 627                 /* for S1600 and S3200 */
 628                 if (device->max_speed == SCODE_BETA)
 629                         device->max_speed = card->link_speed;
 630
 631                 while (device->max_speed > SCODE_100) {
 632                         if (read_rom(device, generation, 0, &dummy) ==
 633                             RCODE_COMPLETE)
 634                                 break;
 635                         device->max_speed--;
 636                 }
 637         }
 638
 639         /*
 640          * Now parse the config rom.  The config rom is a recursive
 641          * directory structure so we parse it using a stack of
 642          * references to the blocks that make up the structure.  We
 643          * push a reference to the root directory on the stack to
 644          * start things off.
 645          */
 646         length = i;
 647         sp = 0;
 648         stack[sp++] = 0xc0000005;
 649         while (sp > 0) {
 650                 /*
 651                  * Pop the next block reference of the stack.  The
 652                  * lower 24 bits is the offset into the config rom,
 653                  * the upper 8 bits are the type of the reference the
 654                  * block.
 655                  */
 656                 key = stack[--sp];
 657                 i = key & 0xffffff;
 658                 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
 659                         ret = -ENXIO;
 660                         goto out;
 661                 }
 662
 663                 /* Read header quadlet for the block to get the length. */
 664                 ret = read_rom(device, generation, i, &rom[i]);
 665                 if (ret != RCODE_COMPLETE)
 666                         goto out;
 667                 end = i + (rom[i] >> 16) + 1;
 668                 if (end > MAX_CONFIG_ROM_SIZE) {
 669                         /*
 670                          * This block extends outside the config ROM which is
 671                          * a firmware bug.  Ignore this whole block, i.e.
 672                          * simply set a fake block length of 0.
 673                          */
 674                         fw_err(card, "skipped invalid ROM block %x at %llx\n",
 675                                rom[i],
 676                                i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
 677                         rom[i] = 0;
 678                         end = i;
 679                 }
 680                 i++;
 681
 682                 /*
 683                  * Now read in the block.  If this is a directory
 684                  * block, check the entries as we read them to see if
 685                  * it references another block, and push it in that case.
 686                  */
 687                 for (; i < end; i++) {
 688                         ret = read_rom(device, generation, i, &rom[i]);
 689                         if (ret != RCODE_COMPLETE)
 690                                 goto out;
 691
 692                         if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
 693                                 continue;
 694                         /*
 695                          * Offset points outside the ROM.  May be a firmware
 696                          * bug or an Extended ROM entry (IEEE 1212-2001 clause
 697                          * 7.7.18).  Simply overwrite this pointer here by a
 698                          * fake immediate entry so that later iterators over
 699                          * the ROM don't have to check offsets all the time.
 700                          */
 701                         if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
 702                                 fw_err(card,
 703                                        "skipped unsupported ROM entry %x at %llx\n",
 704                                        rom[i],
 705                                        i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
 706                                 rom[i] = 0;
 707                                 continue;
 708                         }
 709                         stack[sp++] = i + rom[i];
 710                 }
 711                 if (length < i)
 712                         length = i;
 713         }
 714
 715         old_rom = device->config_rom;
 716         new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
 717         if (new_rom == NULL) {
 718                 ret = -ENOMEM;
 719                 goto out;
 720         }
 721
 722         down_write(&fw_device_rwsem);
 723         device->config_rom = new_rom;
 724         device->config_rom_length = length;
 725         up_write(&fw_device_rwsem);
 726
 727         kfree(old_rom);
 728         ret = RCODE_COMPLETE;
 729         device->max_rec = rom[2] >> 12 & 0xf;
 730         device->cmc     = rom[2] >> 30 & 1;
 731         device->irmc    = rom[2] >> 31 & 1;
 732  out:
 733         kfree(rom);
 734
 735         return ret;
 736 }
 737
 738 static void fw_unit_release(struct device *dev)
 739 {
 740         struct fw_unit *unit = fw_unit(dev);
 741
 742         fw_device_put(fw_parent_device(unit));
 743         kfree(unit);
 744 }
 745
 746 static struct device_type fw_unit_type = {
 747         .uevent         = fw_unit_uevent,
 748         .release        = fw_unit_release,
 749 };
 750
 751 static bool is_fw_unit(const struct device *dev)
 752 {
 753         return dev->type == &fw_unit_type;
 754 }
 755
 756 static void create_units(struct fw_device *device)
 757 {
 758         struct fw_csr_iterator ci;
 759         struct fw_unit *unit;
 760         int key, value, i;
 761
 762         i = 0;
 763         fw_csr_iterator_init(&ci, &device->config_rom[ROOT_DIR_OFFSET]);
 764         while (fw_csr_iterator_next(&ci, &key, &value)) {
 765                 if (key != (CSR_UNIT | CSR_DIRECTORY))
 766                         continue;
 767
 768                 /*
 769                  * Get the address of the unit directory and try to
 770                  * match the drivers id_tables against it.
 771                  */
 772                 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
 773                 if (unit == NULL)
 774                         continue;
 775
 776                 unit->directory = ci.p + value - 1;
 777                 unit->device.bus = &fw_bus_type;
 778                 unit->device.type = &fw_unit_type;
 779                 unit->device.parent = &device->device;
 780                 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
 781
 782                 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
 783                                 ARRAY_SIZE(fw_unit_attributes) +
 784                                 ARRAY_SIZE(config_rom_attributes));
 785                 init_fw_attribute_group(&unit->device,
 786                                         fw_unit_attributes,
 787                                         &unit->attribute_group);
 788
 789                 fw_device_get(device);
 790                 if (device_register(&unit->device) < 0) {
 791                         put_device(&unit->device);
 792                         continue;
 793                 }
 794         }
 795 }
 796
 797 static int shutdown_unit(struct device *device, void *data)
 798 {
 799         device_unregister(device);
 800
 801         return 0;
 802 }
 803
 804 /*
 805  * fw_device_rwsem acts as dual purpose mutex:
 806  *   - serializes accesses to fw_device_idr,
 807  *   - serializes accesses to fw_device.config_rom/.config_rom_length and
 808  *     fw_unit.directory, unless those accesses happen at safe occasions
 809  */
 810 DECLARE_RWSEM(fw_device_rwsem);
 811
 812 DEFINE_IDR(fw_device_idr);
 813 int fw_cdev_major;
 814
 815 struct fw_device *fw_device_get_by_devt(dev_t devt)
 816 {
 817         struct fw_device *device;
 818
 819         down_read(&fw_device_rwsem);
 820         device = idr_find(&fw_device_idr, MINOR(devt));
 821         if (device)
 822                 fw_device_get(device);
 823         up_read(&fw_device_rwsem);
 824
 825         return device;
 826 }
 827
 828 struct workqueue_struct *fw_workqueue;
 829 EXPORT_SYMBOL(fw_workqueue);
 830
 831 static void fw_schedule_device_work(struct fw_device *device,
 832                                     unsigned long delay)
 833 {
 834         queue_delayed_work(fw_workqueue, &device->work, delay);
 835 }
 836
 837 /*
 838  * These defines control the retry behavior for reading the config
 839  * rom.  It shouldn't be necessary to tweak these; if the device
 840  * doesn't respond to a config rom read within 10 seconds, it's not
 841  * going to respond at all.  As for the initial delay, a lot of
 842  * devices will be able to respond within half a second after bus
 843  * reset.  On the other hand, it's not really worth being more
 844  * aggressive than that, since it scales pretty well; if 10 devices
 845  * are plugged in, they're all getting read within one second.
 846  */
 847
 848 #define MAX_RETRIES     10
 849 #define RETRY_DELAY     (3 * HZ)
 850 #define INITIAL_DELAY   (HZ / 2)
 851 #define SHUTDOWN_DELAY  (2 * HZ)
 852
 853 static void fw_device_shutdown(struct work_struct *work)
 854 {
 855         struct fw_device *device =
 856                 container_of(work, struct fw_device, work.work);
 857         int minor = MINOR(device->device.devt);
 858
 859         if (time_before64(get_jiffies_64(),
 860                           device->card->reset_jiffies + SHUTDOWN_DELAY)
 861             && !list_empty(&device->card->link)) {
 862                 fw_schedule_device_work(device, SHUTDOWN_DELAY);
 863                 return;
 864         }
 865
 866         if (atomic_cmpxchg(&device->state,
 867                            FW_DEVICE_GONE,
 868                            FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
 869                 return;
 870
 871         fw_device_cdev_remove(device);
 872         device_for_each_child(&device->device, NULL, shutdown_unit);
 873         device_unregister(&device->device);
 874
 875         down_write(&fw_device_rwsem);
 876         idr_remove(&fw_device_idr, minor);
 877         up_write(&fw_device_rwsem);
 878
 879         fw_device_put(device);
 880 }
 881
 882 static void fw_device_release(struct device *dev)
 883 {
 884         struct fw_device *device = fw_device(dev);
 885         struct fw_card *card = device->card;
 886         unsigned long flags;
 887
 888         /*
 889          * Take the card lock so we don't set this to NULL while a
 890          * FW_NODE_UPDATED callback is being handled or while the
 891          * bus manager work looks at this node.
 892          */
 893         spin_lock_irqsave(&card->lock, flags);
 894         device->node->data = NULL;
 895         spin_unlock_irqrestore(&card->lock, flags);
 896
 897         fw_node_put(device->node);
 898         kfree(device->config_rom);
 899         kfree(device);
 900         fw_card_put(card);
 901 }
 902
 903 static struct device_type fw_device_type = {
 904         .release = fw_device_release,
 905 };
 906
 907 static bool is_fw_device(const struct device *dev)
 908 {
 909         return dev->type == &fw_device_type;
 910 }
 911
 912 static int update_unit(struct device *dev, void *data)
 913 {
 914         struct fw_unit *unit = fw_unit(dev);
 915         struct fw_driver *driver = (struct fw_driver *)dev->driver;
 916
 917         if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
 918                 device_lock(dev);
 919                 driver->update(unit);
 920                 device_unlock(dev);
 921         }
 922
 923         return 0;
 924 }
 925
 926 static void fw_device_update(struct work_struct *work)
 927 {
 928         struct fw_device *device =
 929                 container_of(work, struct fw_device, work.work);
 930
 931         fw_device_cdev_update(device);
 932         device_for_each_child(&device->device, NULL, update_unit);
 933 }
 934
 935 /*
 936  * If a device was pending for deletion because its node went away but its
 937  * bus info block and root directory header matches that of a newly discovered
 938  * device, revive the existing fw_device.
 939  * The newly allocated fw_device becomes obsolete instead.
 940  */
 941 static int lookup_existing_device(struct device *dev, void *data)
 942 {
 943         struct fw_device *old = fw_device(dev);
 944         struct fw_device *new = data;
 945         struct fw_card *card = new->card;
 946         int match = 0;
 947
 948         if (!is_fw_device(dev))
 949                 return 0;
 950
 951         down_read(&fw_device_rwsem); /* serialize config_rom access */
 952         spin_lock_irq(&card->lock);  /* serialize node access */
 953
 954         if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
 955             atomic_cmpxchg(&old->state,
 956                            FW_DEVICE_GONE,
 957                            FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
 958                 struct fw_node *current_node = new->node;
 959                 struct fw_node *obsolete_node = old->node;
 960
 961                 new->node = obsolete_node;
 962                 new->node->data = new;
 963                 old->node = current_node;
 964                 old->node->data = old;
 965
 966                 old->max_speed = new->max_speed;
 967                 old->node_id = current_node->node_id;
 968                 smp_wmb();  /* update node_id before generation */
 969                 old->generation = card->generation;
 970                 old->config_rom_retries = 0;
 971                 fw_notice(card, "rediscovered device %s\n", dev_name(dev));
 972
 973                 old->workfn = fw_device_update;
 974                 fw_schedule_device_work(old, 0);
 975
 976                 if (current_node == card->root_node)
 977                         fw_schedule_bm_work(card, 0);
 978
 979                 match = 1;
 980         }
 981
 982         spin_unlock_irq(&card->lock);
 983         up_read(&fw_device_rwsem);
 984
 985         return match;
 986 }
 987
 988 enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
 989
 990 static void set_broadcast_channel(struct fw_device *device, int generation)
 991 {
 992         struct fw_card *card = device->card;
 993         __be32 data;
 994         int rcode;
 995
 996         if (!card->broadcast_channel_allocated)
 997                 return;
 998
 999         /*
1000          * The Broadcast_Channel Valid bit is required by nodes which want to
1001          * transmit on this channel.  Such transmissions are practically
1002          * exclusive to IP over 1394 (RFC 2734).  IP capable nodes are required
1003          * to be IRM capable and have a max_rec of 8 or more.  We use this fact
1004          * to narrow down to which nodes we send Broadcast_Channel updates.
1005          */
1006         if (!device->irmc || device->max_rec < 8)
1007                 return;
1008
1009         /*
1010          * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
1011          * Perform a read test first.
1012          */
1013         if (device->bc_implemented == BC_UNKNOWN) {
1014                 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
1015                                 device->node_id, generation, device->max_speed,
1016                                 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
1017                                 &data, 4);
1018                 switch (rcode) {
1019                 case RCODE_COMPLETE:
1020                         if (data & cpu_to_be32(1 << 31)) {
1021                                 device->bc_implemented = BC_IMPLEMENTED;
1022                                 break;
1023                         }
1024                         fallthrough;    /* to case address error */
1025                 case RCODE_ADDRESS_ERROR:
1026                         device->bc_implemented = BC_UNIMPLEMENTED;
1027                 }
1028         }
1029
1030         if (device->bc_implemented == BC_IMPLEMENTED) {
1031                 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
1032                                    BROADCAST_CHANNEL_VALID);
1033                 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
1034                                 device->node_id, generation, device->max_speed,
1035                                 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
1036                                 &data, 4);
1037         }
1038 }
1039
1040 int fw_device_set_broadcast_channel(struct device *dev, void *gen)
1041 {
1042         if (is_fw_device(dev))
1043                 set_broadcast_channel(fw_device(dev), (long)gen);
1044
1045         return 0;
1046 }
1047
1048 static void fw_device_init(struct work_struct *work)
1049 {
1050         struct fw_device *device =
1051                 container_of(work, struct fw_device, work.work);
1052         struct fw_card *card = device->card;
1053         struct device *revived_dev;
1054         int minor, ret;
1055
1056         /*
1057          * All failure paths here set node->data to NULL, so that we
1058          * don't try to do device_for_each_child() on a kfree()'d
1059          * device.
1060          */
1061
1062         ret = read_config_rom(device, device->generation);
1063         if (ret != RCODE_COMPLETE) {
1064                 if (device->config_rom_retries < MAX_RETRIES &&
1065                     atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1066                         device->config_rom_retries++;
1067                         fw_schedule_device_work(device, RETRY_DELAY);
1068                 } else {
1069                         if (device->node->link_on)
1070                                 fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
1071                                           device->node_id,
1072                                           fw_rcode_string(ret));
1073                         if (device->node == card->root_node)
1074                                 fw_schedule_bm_work(card, 0);
1075                         fw_device_release(&device->device);
1076                 }
1077                 return;
1078         }
1079
1080         revived_dev = device_find_child(card->device,
1081                                         device, lookup_existing_device);
1082         if (revived_dev) {
1083                 put_device(revived_dev);
1084                 fw_device_release(&device->device);
1085
1086                 return;
1087         }
1088
1089         device_initialize(&device->device);
1090
1091         fw_device_get(device);
1092         down_write(&fw_device_rwsem);
1093         minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,
1094                         GFP_KERNEL);
1095         up_write(&fw_device_rwsem);
1096
1097         if (minor < 0)
1098                 goto error;
1099
1100         device->device.bus = &fw_bus_type;
1101         device->device.type = &fw_device_type;
1102         device->device.parent = card->device;
1103         device->device.devt = MKDEV(fw_cdev_major, minor);
1104         dev_set_name(&device->device, "fw%d", minor);
1105
1106         BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1107                         ARRAY_SIZE(fw_device_attributes) +
1108                         ARRAY_SIZE(config_rom_attributes));
1109         init_fw_attribute_group(&device->device,
1110                                 fw_device_attributes,
1111                                 &device->attribute_group);
1112
1113         if (device_add(&device->device)) {
1114                 fw_err(card, "failed to add device\n");
1115                 goto error_with_cdev;
1116         }
1117
1118         create_units(device);
1119
1120         /*
1121          * Transition the device to running state.  If it got pulled
1122          * out from under us while we did the initialization work, we
1123          * have to shut down the device again here.  Normally, though,
1124          * fw_node_event will be responsible for shutting it down when
1125          * necessary.  We have to use the atomic cmpxchg here to avoid
1126          * racing with the FW_NODE_DESTROYED case in
1127          * fw_node_event().
1128          */
1129         if (atomic_cmpxchg(&device->state,
1130                            FW_DEVICE_INITIALIZING,
1131                            FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1132                 device->workfn = fw_device_shutdown;
1133                 fw_schedule_device_work(device, SHUTDOWN_DELAY);
1134         } else {
1135                 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
1136                           dev_name(&device->device),
1137                           device->config_rom[3], device->config_rom[4],
1138                           1 << device->max_speed);
1139                 device->config_rom_retries = 0;
1140
1141                 set_broadcast_channel(device, device->generation);
1142
1143                 add_device_randomness(&device->config_rom[3], 8);
1144         }
1145
1146         /*
1147          * Reschedule the IRM work if we just finished reading the
1148          * root node config rom.  If this races with a bus reset we
1149          * just end up running the IRM work a couple of extra times -
1150          * pretty harmless.
1151          */
1152         if (device->node == card->root_node)
1153                 fw_schedule_bm_work(card, 0);
1154
1155         return;
1156
1157  error_with_cdev:
1158         down_write(&fw_device_rwsem);
1159         idr_remove(&fw_device_idr, minor);
1160         up_write(&fw_device_rwsem);
1161  error:
1162         fw_device_put(device);          /* fw_device_idr's reference */
1163
1164         put_device(&device->device);    /* our reference */
1165 }
1166
1167 /* Reread and compare bus info block and header of root directory */
1168 static int reread_config_rom(struct fw_device *device, int generation,
1169                              bool *changed)
1170 {
1171         u32 q;
1172         int i, rcode;
1173
1174         for (i = 0; i < 6; i++) {
1175                 rcode = read_rom(device, generation, i, &q);
1176                 if (rcode != RCODE_COMPLETE)
1177                         return rcode;
1178
1179                 if (i == 0 && q == 0)
1180                         /* inaccessible (see read_config_rom); retry later */
1181                         return RCODE_BUSY;
1182
1183                 if (q != device->config_rom[i]) {
1184                         *changed = true;
1185                         return RCODE_COMPLETE;
1186                 }
1187         }
1188
1189         *changed = false;
1190         return RCODE_COMPLETE;
1191 }
1192
1193 static void fw_device_refresh(struct work_struct *work)
1194 {
1195         struct fw_device *device =
1196                 container_of(work, struct fw_device, work.work);
1197         struct fw_card *card = device->card;
1198         int ret, node_id = device->node_id;
1199         bool changed;
1200
1201         ret = reread_config_rom(device, device->generation, &changed);
1202         if (ret != RCODE_COMPLETE)
1203                 goto failed_config_rom;
1204
1205         if (!changed) {
1206                 if (atomic_cmpxchg(&device->state,
1207                                    FW_DEVICE_INITIALIZING,
1208                                    FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1209                         goto gone;
1210
1211                 fw_device_update(work);
1212                 device->config_rom_retries = 0;
1213                 goto out;
1214         }
1215
1216         /*
1217          * Something changed.  We keep things simple and don't investigate
1218          * further.  We just destroy all previous units and create new ones.
1219          */
1220         device_for_each_child(&device->device, NULL, shutdown_unit);
1221
1222         ret = read_config_rom(device, device->generation);
1223         if (ret != RCODE_COMPLETE)
1224                 goto failed_config_rom;
1225
1226         fw_device_cdev_update(device);
1227         create_units(device);
1228
1229         /* Userspace may want to re-read attributes. */
1230         kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1231
1232         if (atomic_cmpxchg(&device->state,
1233                            FW_DEVICE_INITIALIZING,
1234                            FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1235                 goto gone;
1236
1237         fw_notice(card, "refreshed device %s\n", dev_name(&device->device));
1238         device->config_rom_retries = 0;
1239         goto out;
1240
1241  failed_config_rom:
1242         if (device->config_rom_retries < MAX_RETRIES &&
1243             atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1244                 device->config_rom_retries++;
1245                 fw_schedule_device_work(device, RETRY_DELAY);
1246                 return;
1247         }
1248
1249         fw_notice(card, "giving up on refresh of device %s: %s\n",
1250                   dev_name(&device->device), fw_rcode_string(ret));
1251  gone:
1252         atomic_set(&device->state, FW_DEVICE_GONE);
1253         device->workfn = fw_device_shutdown;
1254         fw_schedule_device_work(device, SHUTDOWN_DELAY);
1255  out:
1256         if (node_id == card->root_node->node_id)
1257                 fw_schedule_bm_work(card, 0);
1258 }
1259
1260 static void fw_device_workfn(struct work_struct *work)
1261 {
1262         struct fw_device *device = container_of(to_delayed_work(work),
1263                                                 struct fw_device, work);
1264         device->workfn(work);
1265 }
1266
1267 void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1268 {
1269         struct fw_device *device;
1270
1271         switch (event) {
1272         case FW_NODE_CREATED:
1273                 /*
1274                  * Attempt to scan the node, regardless whether its self ID has
1275                  * the L (link active) flag set or not.  Some broken devices
1276                  * send L=0 but have an up-and-running link; others send L=1
1277                  * without actually having a link.
1278                  */
1279  create:
1280                 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1281                 if (device == NULL)
1282                         break;
1283
1284                 /*
1285                  * Do minimal initialization of the device here, the
1286                  * rest will happen in fw_device_init().
1287                  *
1288                  * Attention:  A lot of things, even fw_device_get(),
1289                  * cannot be done before fw_device_init() finished!
1290                  * You can basically just check device->state and
1291                  * schedule work until then, but only while holding
1292                  * card->lock.
1293                  */
1294                 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
1295                 device->card = fw_card_get(card);
1296                 device->node = fw_node_get(node);
1297                 device->node_id = node->node_id;
1298                 device->generation = card->generation;
1299                 device->is_local = node == card->local_node;
1300                 mutex_init(&device->client_list_mutex);
1301                 INIT_LIST_HEAD(&device->client_list);
1302
1303                 /*
1304                  * Set the node data to point back to this device so
1305                  * FW_NODE_UPDATED callbacks can update the node_id
1306                  * and generation for the device.
1307                  */
1308                 node->data = device;
1309
1310                 /*
1311                  * Many devices are slow to respond after bus resets,
1312                  * especially if they are bus powered and go through
1313                  * power-up after getting plugged in.  We schedule the
1314                  * first config rom scan half a second after bus reset.
1315                  */
1316                 device->workfn = fw_device_init;
1317                 INIT_DELAYED_WORK(&device->work, fw_device_workfn);
1318                 fw_schedule_device_work(device, INITIAL_DELAY);
1319                 break;
1320
1321         case FW_NODE_INITIATED_RESET:
1322         case FW_NODE_LINK_ON:
1323                 device = node->data;
1324                 if (device == NULL)
1325                         goto create;
1326
1327                 device->node_id = node->node_id;
1328                 smp_wmb();  /* update node_id before generation */
1329                 device->generation = card->generation;
1330                 if (atomic_cmpxchg(&device->state,
1331                             FW_DEVICE_RUNNING,
1332                             FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1333                         device->workfn = fw_device_refresh;
1334                         fw_schedule_device_work(device,
1335                                 device->is_local ? 0 : INITIAL_DELAY);
1336                 }
1337                 break;
1338
1339         case FW_NODE_UPDATED:
1340                 device = node->data;
1341                 if (device == NULL)
1342                         break;
1343
1344                 device->node_id = node->node_id;
1345                 smp_wmb();  /* update node_id before generation */
1346                 device->generation = card->generation;
1347                 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1348                         device->workfn = fw_device_update;
1349                         fw_schedule_device_work(device, 0);
1350                 }
1351                 break;
1352
1353         case FW_NODE_DESTROYED:
1354         case FW_NODE_LINK_OFF:
1355                 if (!node->data)
1356                         break;
1357
1358                 /*
1359                  * Destroy the device associated with the node.  There
1360                  * are two cases here: either the device is fully
1361                  * initialized (FW_DEVICE_RUNNING) or we're in the
1362                  * process of reading its config rom
1363                  * (FW_DEVICE_INITIALIZING).  If it is fully
1364                  * initialized we can reuse device->work to schedule a
1365                  * full fw_device_shutdown().  If not, there's work
1366                  * scheduled to read it's config rom, and we just put
1367                  * the device in shutdown state to have that code fail
1368                  * to create the device.
1369                  */
1370                 device = node->data;
1371                 if (atomic_xchg(&device->state,
1372                                 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
1373                         device->workfn = fw_device_shutdown;
1374                         fw_schedule_device_work(device,
1375                                 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
1376                 }
1377                 break;
1378         }
1379 }
1380
1381 #ifdef CONFIG_FIREWIRE_KUNIT_DEVICE_ATTRIBUTE_TEST
1382 #include "device-attribute-test.c"
1383 #endif