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 just after the entry with the
 122  * @key. The string is zero-terminated. An overlong string is silently truncated such that it
 123  * and the zero byte fit into @size.
 124  *
 125  * Returns strlen(buf) or a negative error code.
 126  */
 127 int fw_csr_string(const u32 *directory, int key, char *buf, size_t size)
 128 {
 129         const u32 *leaf = search_leaf(directory, key);
 130         if (!leaf)
 131                 return -ENOENT;
 132
 133         return textual_leaf_to_string(leaf, buf, size);
 134 }
 135 EXPORT_SYMBOL(fw_csr_string);
 136
 137 static void get_ids(const u32 *directory, int *id)
 138 {
 139         struct fw_csr_iterator ci;
 140         int key, value;
 141
 142         fw_csr_iterator_init(&ci, directory);
 143         while (fw_csr_iterator_next(&ci, &key, &value)) {
 144                 switch (key) {
 145                 case CSR_VENDOR:        id[0] = value; break;
 146                 case CSR_MODEL:         id[1] = value; break;
 147                 case CSR_SPECIFIER_ID:  id[2] = value; break;
 148                 case CSR_VERSION:       id[3] = value; break;
 149                 }
 150         }
 151 }
 152
 153 static void get_modalias_ids(const struct fw_unit *unit, int *id)
 154 {
 155         const u32 *root_directory = &fw_parent_device(unit)->config_rom[ROOT_DIR_OFFSET];
 156         const u32 *directories[] = {NULL, NULL, NULL};
 157         const u32 *vendor_directory;
 158         int i;
 159
 160         directories[0] = root_directory;
 161
 162         // Legacy layout of configuration ROM described in Annex 1 of 'Configuration ROM for AV/C
 163         // Devices 1.0 (December 12, 2000, 1394 Trading Association, TA Document 1999027)'.
 164         vendor_directory = search_directory(root_directory, CSR_VENDOR);
 165         if (!vendor_directory) {
 166                 directories[1] = unit->directory;
 167         } else {
 168                 directories[1] = vendor_directory;
 169                 directories[2] = unit->directory;
 170         }
 171
 172         for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i)
 173                 get_ids(directories[i], id);
 174 }
 175
 176 static bool match_ids(const struct ieee1394_device_id *id_table, int *id)
 177 {
 178         int match = 0;
 179
 180         if (id[0] == id_table->vendor_id)
 181                 match |= IEEE1394_MATCH_VENDOR_ID;
 182         if (id[1] == id_table->model_id)
 183                 match |= IEEE1394_MATCH_MODEL_ID;
 184         if (id[2] == id_table->specifier_id)
 185                 match |= IEEE1394_MATCH_SPECIFIER_ID;
 186         if (id[3] == id_table->version)
 187                 match |= IEEE1394_MATCH_VERSION;
 188
 189         return (match & id_table->match_flags) == id_table->match_flags;
 190 }
 191
 192 static const struct ieee1394_device_id *unit_match(struct device *dev,
 193                                                    struct device_driver *drv)
 194 {
 195         const struct ieee1394_device_id *id_table =
 196                         container_of(drv, struct fw_driver, driver)->id_table;
 197         int id[] = {0, 0, 0, 0};
 198
 199         get_modalias_ids(fw_unit(dev), id);
 200
 201         for (; id_table->match_flags != 0; id_table++)
 202                 if (match_ids(id_table, id))
 203                         return id_table;
 204
 205         return NULL;
 206 }
 207
 208 static bool is_fw_unit(const struct device *dev);
 209
 210 static int fw_unit_match(struct device *dev, struct device_driver *drv)
 211 {
 212         /* We only allow binding to fw_units. */
 213         return is_fw_unit(dev) && unit_match(dev, drv) != NULL;
 214 }
 215
 216 static int fw_unit_probe(struct device *dev)
 217 {
 218         struct fw_driver *driver =
 219                         container_of(dev->driver, struct fw_driver, driver);
 220
 221         return driver->probe(fw_unit(dev), unit_match(dev, dev->driver));
 222 }
 223
 224 static void fw_unit_remove(struct device *dev)
 225 {
 226         struct fw_driver *driver =
 227                         container_of(dev->driver, struct fw_driver, driver);
 228
 229         driver->remove(fw_unit(dev));
 230 }
 231
 232 static int get_modalias(const struct fw_unit *unit, char *buffer, size_t buffer_size)
 233 {
 234         int id[] = {0, 0, 0, 0};
 235
 236         get_modalias_ids(unit, id);
 237
 238         return snprintf(buffer, buffer_size,
 239                         "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
 240                         id[0], id[1], id[2], id[3]);
 241 }
 242
 243 static int fw_unit_uevent(const struct device *dev, struct kobj_uevent_env *env)
 244 {
 245         const struct fw_unit *unit = fw_unit(dev);
 246         char modalias[64];
 247
 248         get_modalias(unit, modalias, sizeof(modalias));
 249
 250         if (add_uevent_var(env, "MODALIAS=%s", modalias))
 251                 return -ENOMEM;
 252
 253         return 0;
 254 }
 255
 256 const struct bus_type fw_bus_type = {
 257         .name = "firewire",
 258         .match = fw_unit_match,
 259         .probe = fw_unit_probe,
 260         .remove = fw_unit_remove,
 261 };
 262 EXPORT_SYMBOL(fw_bus_type);
 263
 264 int fw_device_enable_phys_dma(struct fw_device *device)
 265 {
 266         int generation = device->generation;
 267
 268         /* device->node_id, accessed below, must not be older than generation */
 269         smp_rmb();
 270
 271         return device->card->driver->enable_phys_dma(device->card,
 272                                                      device->node_id,
 273                                                      generation);
 274 }
 275 EXPORT_SYMBOL(fw_device_enable_phys_dma);
 276
 277 struct config_rom_attribute {
 278         struct device_attribute attr;
 279         u32 key;
 280 };
 281
 282 static ssize_t show_immediate(struct device *dev,
 283                               struct device_attribute *dattr, char *buf)
 284 {
 285         struct config_rom_attribute *attr =
 286                 container_of(dattr, struct config_rom_attribute, attr);
 287         struct fw_csr_iterator ci;
 288         const u32 *directories[] = {NULL, NULL};
 289         int i, value = -1;
 290
 291         down_read(&fw_device_rwsem);
 292
 293         if (is_fw_unit(dev)) {
 294                 directories[0] = fw_unit(dev)->directory;
 295         } else {
 296                 const u32 *root_directory = fw_device(dev)->config_rom + ROOT_DIR_OFFSET;
 297                 const u32 *vendor_directory = search_directory(root_directory, CSR_VENDOR);
 298
 299                 if (!vendor_directory) {
 300                         directories[0] = root_directory;
 301                 } else {
 302                         // Legacy layout of configuration ROM described in Annex 1 of
 303                         // 'Configuration ROM for AV/C Devices 1.0 (December 12, 2000, 1394 Trading
 304                         // Association, TA Document 1999027)'.
 305                         directories[0] = vendor_directory;
 306                         directories[1] = root_directory;
 307                 }
 308         }
 309
 310         for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i) {
 311                 int key, val;
 312
 313                 fw_csr_iterator_init(&ci, directories[i]);
 314                 while (fw_csr_iterator_next(&ci, &key, &val)) {
 315                         if (attr->key == key)
 316                                 value = val;
 317                 }
 318         }
 319
 320         up_read(&fw_device_rwsem);
 321
 322         if (value < 0)
 323                 return -ENOENT;
 324
 325         // Note that this function is also called by init_fw_attribute_group() with NULL pointer.
 326         return buf ? sysfs_emit(buf, "0x%06x\n", value) : 0;
 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         // Note that this function is also called by init_fw_attribute_group() with NULL pointer.
 362         if (buf) {
 363                 bufsize = PAGE_SIZE - 1;
 364         } else {
 365                 buf = dummy_buf;
 366                 bufsize = 1;
 367         }
 368
 369         for (i = 0; i < ARRAY_SIZE(directories) && !!directories[i]; ++i) {
 370                 int result = fw_csr_string(directories[i], attr->key, buf, bufsize);
 371                 // Detected.
 372                 if (result >= 0) {
 373                         ret = result;
 374                 } else if (i == 0 && attr->key == CSR_VENDOR) {
 375                         // Sony DVMC-DA1 has configuration ROM such that the descriptor leaf entry
 376                         // in the root directory follows to the directory entry for vendor ID
 377                         // instead of the immediate value for vendor ID.
 378                         result = fw_csr_string(directories[i], CSR_DIRECTORY | attr->key, buf,
 379                                                bufsize);
 380                         if (result >= 0)
 381                                 ret = result;
 382                 }
 383         }
 384
 385         if (ret >= 0) {
 386                 /* Strip trailing whitespace and add newline. */
 387                 while (ret > 0 && isspace(buf[ret - 1]))
 388                         ret--;
 389                 strcpy(buf + ret, "\n");
 390                 ret++;
 391         }
 392
 393         up_read(&fw_device_rwsem);
 394
 395         return ret;
 396 }
 397
 398 #define TEXT_LEAF_ATTR(name, key)                               \
 399         { __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }
 400
 401 static struct config_rom_attribute config_rom_attributes[] = {
 402         IMMEDIATE_ATTR(vendor, CSR_VENDOR),
 403         IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
 404         IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
 405         IMMEDIATE_ATTR(version, CSR_VERSION),
 406         IMMEDIATE_ATTR(model, CSR_MODEL),
 407         TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
 408         TEXT_LEAF_ATTR(model_name, CSR_MODEL),
 409         TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
 410 };
 411
 412 static void init_fw_attribute_group(struct device *dev,
 413                                     struct device_attribute *attrs,
 414                                     struct fw_attribute_group *group)
 415 {
 416         struct device_attribute *attr;
 417         int i, j;
 418
 419         for (j = 0; attrs[j].attr.name != NULL; j++)
 420                 group->attrs[j] = &attrs[j].attr;
 421
 422         for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
 423                 attr = &config_rom_attributes[i].attr;
 424                 if (attr->show(dev, attr, NULL) < 0)
 425                         continue;
 426                 group->attrs[j++] = &attr->attr;
 427         }
 428
 429         group->attrs[j] = NULL;
 430         group->groups[0] = &group->group;
 431         group->groups[1] = NULL;
 432         group->group.attrs = group->attrs;
 433         dev->groups = (const struct attribute_group **) group->groups;
 434 }
 435
 436 static ssize_t modalias_show(struct device *dev,
 437                              struct device_attribute *attr, char *buf)
 438 {
 439         struct fw_unit *unit = fw_unit(dev);
 440         int length;
 441
 442         length = get_modalias(unit, buf, PAGE_SIZE);
 443         strcpy(buf + length, "\n");
 444
 445         return length + 1;
 446 }
 447
 448 static ssize_t rom_index_show(struct device *dev,
 449                               struct device_attribute *attr, char *buf)
 450 {
 451         struct fw_device *device = fw_device(dev->parent);
 452         struct fw_unit *unit = fw_unit(dev);
 453
 454         return sysfs_emit(buf, "%td\n", unit->directory - device->config_rom);
 455 }
 456
 457 static struct device_attribute fw_unit_attributes[] = {
 458         __ATTR_RO(modalias),
 459         __ATTR_RO(rom_index),
 460         __ATTR_NULL,
 461 };
 462
 463 static ssize_t config_rom_show(struct device *dev,
 464                                struct device_attribute *attr, char *buf)
 465 {
 466         struct fw_device *device = fw_device(dev);
 467         size_t length;
 468
 469         down_read(&fw_device_rwsem);
 470         length = device->config_rom_length * 4;
 471         memcpy(buf, device->config_rom, length);
 472         up_read(&fw_device_rwsem);
 473
 474         return length;
 475 }
 476
 477 static ssize_t guid_show(struct device *dev,
 478                          struct device_attribute *attr, char *buf)
 479 {
 480         struct fw_device *device = fw_device(dev);
 481         int ret;
 482
 483         down_read(&fw_device_rwsem);
 484         ret = sysfs_emit(buf, "0x%08x%08x\n", device->config_rom[3], device->config_rom[4]);
 485         up_read(&fw_device_rwsem);
 486
 487         return ret;
 488 }
 489
 490 static ssize_t is_local_show(struct device *dev,
 491                              struct device_attribute *attr, char *buf)
 492 {
 493         struct fw_device *device = fw_device(dev);
 494
 495         return sysfs_emit(buf, "%u\n", device->is_local);
 496 }
 497
 498 static int units_sprintf(char *buf, const u32 *directory)
 499 {
 500         struct fw_csr_iterator ci;
 501         int key, value;
 502         int specifier_id = 0;
 503         int version = 0;
 504
 505         fw_csr_iterator_init(&ci, directory);
 506         while (fw_csr_iterator_next(&ci, &key, &value)) {
 507                 switch (key) {
 508                 case CSR_SPECIFIER_ID:
 509                         specifier_id = value;
 510                         break;
 511                 case CSR_VERSION:
 512                         version = value;
 513                         break;
 514                 }
 515         }
 516
 517         return sprintf(buf, "0x%06x:0x%06x ", specifier_id, version);
 518 }
 519
 520 static ssize_t units_show(struct device *dev,
 521                           struct device_attribute *attr, char *buf)
 522 {
 523         struct fw_device *device = fw_device(dev);
 524         struct fw_csr_iterator ci;
 525         int key, value, i = 0;
 526
 527         down_read(&fw_device_rwsem);
 528         fw_csr_iterator_init(&ci, &device->config_rom[ROOT_DIR_OFFSET]);
 529         while (fw_csr_iterator_next(&ci, &key, &value)) {
 530                 if (key != (CSR_UNIT | CSR_DIRECTORY))
 531                         continue;
 532                 i += units_sprintf(&buf[i], ci.p + value - 1);
 533                 if (i >= PAGE_SIZE - (8 + 1 + 8 + 1))
 534                         break;
 535         }
 536         up_read(&fw_device_rwsem);
 537
 538         if (i)
 539                 buf[i - 1] = '\n';
 540
 541         return i;
 542 }
 543
 544 static struct device_attribute fw_device_attributes[] = {
 545         __ATTR_RO(config_rom),
 546         __ATTR_RO(guid),
 547         __ATTR_RO(is_local),
 548         __ATTR_RO(units),
 549         __ATTR_NULL,
 550 };
 551
 552 static int read_rom(struct fw_device *device,
 553                     int generation, int index, u32 *data)
 554 {
 555         u64 offset = (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + index * 4;
 556         int i, rcode;
 557
 558         /* device->node_id, accessed below, must not be older than generation */
 559         smp_rmb();
 560
 561         for (i = 10; i < 100; i += 10) {
 562                 rcode = fw_run_transaction(device->card,
 563                                 TCODE_READ_QUADLET_REQUEST, device->node_id,
 564                                 generation, device->max_speed, offset, data, 4);
 565                 if (rcode != RCODE_BUSY)
 566                         break;
 567                 msleep(i);
 568         }
 569         be32_to_cpus(data);
 570
 571         return rcode;
 572 }
 573
 574 #define MAX_CONFIG_ROM_SIZE 256
 575
 576 /*
 577  * Read the bus info block, perform a speed probe, and read all of the rest of
 578  * the config ROM.  We do all this with a cached bus generation.  If the bus
 579  * generation changes under us, read_config_rom will fail and get retried.
 580  * It's better to start all over in this case because the node from which we
 581  * are reading the ROM may have changed the ROM during the reset.
 582  * Returns either a result code or a negative error code.
 583  */
 584 static int read_config_rom(struct fw_device *device, int generation)
 585 {
 586         struct fw_card *card = device->card;
 587         const u32 *old_rom, *new_rom;
 588         u32 *rom, *stack;
 589         u32 sp, key;
 590         int i, end, length, ret;
 591
 592         rom = kmalloc(sizeof(*rom) * MAX_CONFIG_ROM_SIZE +
 593                       sizeof(*stack) * MAX_CONFIG_ROM_SIZE, GFP_KERNEL);
 594         if (rom == NULL)
 595                 return -ENOMEM;
 596
 597         stack = &rom[MAX_CONFIG_ROM_SIZE];
 598         memset(rom, 0, sizeof(*rom) * MAX_CONFIG_ROM_SIZE);
 599
 600         device->max_speed = SCODE_100;
 601
 602         /* First read the bus info block. */
 603         for (i = 0; i < 5; i++) {
 604                 ret = read_rom(device, generation, i, &rom[i]);
 605                 if (ret != RCODE_COMPLETE)
 606                         goto out;
 607                 /*
 608                  * As per IEEE1212 7.2, during initialization, devices can
 609                  * reply with a 0 for the first quadlet of the config
 610                  * rom to indicate that they are booting (for example,
 611                  * if the firmware is on the disk of a external
 612                  * harddisk).  In that case we just fail, and the
 613                  * retry mechanism will try again later.
 614                  */
 615                 if (i == 0 && rom[i] == 0) {
 616                         ret = RCODE_BUSY;
 617                         goto out;
 618                 }
 619         }
 620
 621         device->max_speed = device->node->max_speed;
 622
 623         /*
 624          * Determine the speed of
 625          *   - devices with link speed less than PHY speed,
 626          *   - devices with 1394b PHY (unless only connected to 1394a PHYs),
 627          *   - all devices if there are 1394b repeaters.
 628          * Note, we cannot use the bus info block's link_spd as starting point
 629          * because some buggy firmwares set it lower than necessary and because
 630          * 1394-1995 nodes do not have the field.
 631          */
 632         if ((rom[2] & 0x7) < device->max_speed ||
 633             device->max_speed == SCODE_BETA ||
 634             card->beta_repeaters_present) {
 635                 u32 dummy;
 636
 637                 /* for S1600 and S3200 */
 638                 if (device->max_speed == SCODE_BETA)
 639                         device->max_speed = card->link_speed;
 640
 641                 while (device->max_speed > SCODE_100) {
 642                         if (read_rom(device, generation, 0, &dummy) ==
 643                             RCODE_COMPLETE)
 644                                 break;
 645                         device->max_speed--;
 646                 }
 647         }
 648
 649         /*
 650          * Now parse the config rom.  The config rom is a recursive
 651          * directory structure so we parse it using a stack of
 652          * references to the blocks that make up the structure.  We
 653          * push a reference to the root directory on the stack to
 654          * start things off.
 655          */
 656         length = i;
 657         sp = 0;
 658         stack[sp++] = 0xc0000005;
 659         while (sp > 0) {
 660                 /*
 661                  * Pop the next block reference of the stack.  The
 662                  * lower 24 bits is the offset into the config rom,
 663                  * the upper 8 bits are the type of the reference the
 664                  * block.
 665                  */
 666                 key = stack[--sp];
 667                 i = key & 0xffffff;
 668                 if (WARN_ON(i >= MAX_CONFIG_ROM_SIZE)) {
 669                         ret = -ENXIO;
 670                         goto out;
 671                 }
 672
 673                 /* Read header quadlet for the block to get the length. */
 674                 ret = read_rom(device, generation, i, &rom[i]);
 675                 if (ret != RCODE_COMPLETE)
 676                         goto out;
 677                 end = i + (rom[i] >> 16) + 1;
 678                 if (end > MAX_CONFIG_ROM_SIZE) {
 679                         /*
 680                          * This block extends outside the config ROM which is
 681                          * a firmware bug.  Ignore this whole block, i.e.
 682                          * simply set a fake block length of 0.
 683                          */
 684                         fw_err(card, "skipped invalid ROM block %x at %llx\n",
 685                                rom[i],
 686                                i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
 687                         rom[i] = 0;
 688                         end = i;
 689                 }
 690                 i++;
 691
 692                 /*
 693                  * Now read in the block.  If this is a directory
 694                  * block, check the entries as we read them to see if
 695                  * it references another block, and push it in that case.
 696                  */
 697                 for (; i < end; i++) {
 698                         ret = read_rom(device, generation, i, &rom[i]);
 699                         if (ret != RCODE_COMPLETE)
 700                                 goto out;
 701
 702                         if ((key >> 30) != 3 || (rom[i] >> 30) < 2)
 703                                 continue;
 704                         /*
 705                          * Offset points outside the ROM.  May be a firmware
 706                          * bug or an Extended ROM entry (IEEE 1212-2001 clause
 707                          * 7.7.18).  Simply overwrite this pointer here by a
 708                          * fake immediate entry so that later iterators over
 709                          * the ROM don't have to check offsets all the time.
 710                          */
 711                         if (i + (rom[i] & 0xffffff) >= MAX_CONFIG_ROM_SIZE) {
 712                                 fw_err(card,
 713                                        "skipped unsupported ROM entry %x at %llx\n",
 714                                        rom[i],
 715                                        i * 4 | CSR_REGISTER_BASE | CSR_CONFIG_ROM);
 716                                 rom[i] = 0;
 717                                 continue;
 718                         }
 719                         stack[sp++] = i + rom[i];
 720                 }
 721                 if (length < i)
 722                         length = i;
 723         }
 724
 725         old_rom = device->config_rom;
 726         new_rom = kmemdup(rom, length * 4, GFP_KERNEL);
 727         if (new_rom == NULL) {
 728                 ret = -ENOMEM;
 729                 goto out;
 730         }
 731
 732         down_write(&fw_device_rwsem);
 733         device->config_rom = new_rom;
 734         device->config_rom_length = length;
 735         up_write(&fw_device_rwsem);
 736
 737         kfree(old_rom);
 738         ret = RCODE_COMPLETE;
 739         device->max_rec = rom[2] >> 12 & 0xf;
 740         device->cmc     = rom[2] >> 30 & 1;
 741         device->irmc    = rom[2] >> 31 & 1;
 742  out:
 743         kfree(rom);
 744
 745         return ret;
 746 }
 747
 748 static void fw_unit_release(struct device *dev)
 749 {
 750         struct fw_unit *unit = fw_unit(dev);
 751
 752         fw_device_put(fw_parent_device(unit));
 753         kfree(unit);
 754 }
 755
 756 static struct device_type fw_unit_type = {
 757         .uevent         = fw_unit_uevent,
 758         .release        = fw_unit_release,
 759 };
 760
 761 static bool is_fw_unit(const struct device *dev)
 762 {
 763         return dev->type == &fw_unit_type;
 764 }
 765
 766 static void create_units(struct fw_device *device)
 767 {
 768         struct fw_csr_iterator ci;
 769         struct fw_unit *unit;
 770         int key, value, i;
 771
 772         i = 0;
 773         fw_csr_iterator_init(&ci, &device->config_rom[ROOT_DIR_OFFSET]);
 774         while (fw_csr_iterator_next(&ci, &key, &value)) {
 775                 if (key != (CSR_UNIT | CSR_DIRECTORY))
 776                         continue;
 777
 778                 /*
 779                  * Get the address of the unit directory and try to
 780                  * match the drivers id_tables against it.
 781                  */
 782                 unit = kzalloc(sizeof(*unit), GFP_KERNEL);
 783                 if (unit == NULL)
 784                         continue;
 785
 786                 unit->directory = ci.p + value - 1;
 787                 unit->device.bus = &fw_bus_type;
 788                 unit->device.type = &fw_unit_type;
 789                 unit->device.parent = &device->device;
 790                 dev_set_name(&unit->device, "%s.%d", dev_name(&device->device), i++);
 791
 792                 BUILD_BUG_ON(ARRAY_SIZE(unit->attribute_group.attrs) <
 793                                 ARRAY_SIZE(fw_unit_attributes) +
 794                                 ARRAY_SIZE(config_rom_attributes));
 795                 init_fw_attribute_group(&unit->device,
 796                                         fw_unit_attributes,
 797                                         &unit->attribute_group);
 798
 799                 fw_device_get(device);
 800                 if (device_register(&unit->device) < 0) {
 801                         put_device(&unit->device);
 802                         continue;
 803                 }
 804         }
 805 }
 806
 807 static int shutdown_unit(struct device *device, void *data)
 808 {
 809         device_unregister(device);
 810
 811         return 0;
 812 }
 813
 814 /*
 815  * fw_device_rwsem acts as dual purpose mutex:
 816  *   - serializes accesses to fw_device_idr,
 817  *   - serializes accesses to fw_device.config_rom/.config_rom_length and
 818  *     fw_unit.directory, unless those accesses happen at safe occasions
 819  */
 820 DECLARE_RWSEM(fw_device_rwsem);
 821
 822 DEFINE_IDR(fw_device_idr);
 823 int fw_cdev_major;
 824
 825 struct fw_device *fw_device_get_by_devt(dev_t devt)
 826 {
 827         struct fw_device *device;
 828
 829         down_read(&fw_device_rwsem);
 830         device = idr_find(&fw_device_idr, MINOR(devt));
 831         if (device)
 832                 fw_device_get(device);
 833         up_read(&fw_device_rwsem);
 834
 835         return device;
 836 }
 837
 838 struct workqueue_struct *fw_workqueue;
 839 EXPORT_SYMBOL(fw_workqueue);
 840
 841 static void fw_schedule_device_work(struct fw_device *device,
 842                                     unsigned long delay)
 843 {
 844         queue_delayed_work(fw_workqueue, &device->work, delay);
 845 }
 846
 847 /*
 848  * These defines control the retry behavior for reading the config
 849  * rom.  It shouldn't be necessary to tweak these; if the device
 850  * doesn't respond to a config rom read within 10 seconds, it's not
 851  * going to respond at all.  As for the initial delay, a lot of
 852  * devices will be able to respond within half a second after bus
 853  * reset.  On the other hand, it's not really worth being more
 854  * aggressive than that, since it scales pretty well; if 10 devices
 855  * are plugged in, they're all getting read within one second.
 856  */
 857
 858 #define MAX_RETRIES     10
 859 #define RETRY_DELAY     (3 * HZ)
 860 #define INITIAL_DELAY   (HZ / 2)
 861 #define SHUTDOWN_DELAY  (2 * HZ)
 862
 863 static void fw_device_shutdown(struct work_struct *work)
 864 {
 865         struct fw_device *device =
 866                 container_of(work, struct fw_device, work.work);
 867         int minor = MINOR(device->device.devt);
 868
 869         if (time_before64(get_jiffies_64(),
 870                           device->card->reset_jiffies + SHUTDOWN_DELAY)
 871             && !list_empty(&device->card->link)) {
 872                 fw_schedule_device_work(device, SHUTDOWN_DELAY);
 873                 return;
 874         }
 875
 876         if (atomic_cmpxchg(&device->state,
 877                            FW_DEVICE_GONE,
 878                            FW_DEVICE_SHUTDOWN) != FW_DEVICE_GONE)
 879                 return;
 880
 881         fw_device_cdev_remove(device);
 882         device_for_each_child(&device->device, NULL, shutdown_unit);
 883         device_unregister(&device->device);
 884
 885         down_write(&fw_device_rwsem);
 886         idr_remove(&fw_device_idr, minor);
 887         up_write(&fw_device_rwsem);
 888
 889         fw_device_put(device);
 890 }
 891
 892 static void fw_device_release(struct device *dev)
 893 {
 894         struct fw_device *device = fw_device(dev);
 895         struct fw_card *card = device->card;
 896         unsigned long flags;
 897
 898         /*
 899          * Take the card lock so we don't set this to NULL while a
 900          * FW_NODE_UPDATED callback is being handled or while the
 901          * bus manager work looks at this node.
 902          */
 903         spin_lock_irqsave(&card->lock, flags);
 904         device->node->data = NULL;
 905         spin_unlock_irqrestore(&card->lock, flags);
 906
 907         fw_node_put(device->node);
 908         kfree(device->config_rom);
 909         kfree(device);
 910         fw_card_put(card);
 911 }
 912
 913 static struct device_type fw_device_type = {
 914         .release = fw_device_release,
 915 };
 916
 917 static bool is_fw_device(const struct device *dev)
 918 {
 919         return dev->type == &fw_device_type;
 920 }
 921
 922 static int update_unit(struct device *dev, void *data)
 923 {
 924         struct fw_unit *unit = fw_unit(dev);
 925         struct fw_driver *driver = (struct fw_driver *)dev->driver;
 926
 927         if (is_fw_unit(dev) && driver != NULL && driver->update != NULL) {
 928                 device_lock(dev);
 929                 driver->update(unit);
 930                 device_unlock(dev);
 931         }
 932
 933         return 0;
 934 }
 935
 936 static void fw_device_update(struct work_struct *work)
 937 {
 938         struct fw_device *device =
 939                 container_of(work, struct fw_device, work.work);
 940
 941         fw_device_cdev_update(device);
 942         device_for_each_child(&device->device, NULL, update_unit);
 943 }
 944
 945 /*
 946  * If a device was pending for deletion because its node went away but its
 947  * bus info block and root directory header matches that of a newly discovered
 948  * device, revive the existing fw_device.
 949  * The newly allocated fw_device becomes obsolete instead.
 950  */
 951 static int lookup_existing_device(struct device *dev, void *data)
 952 {
 953         struct fw_device *old = fw_device(dev);
 954         struct fw_device *new = data;
 955         struct fw_card *card = new->card;
 956         int match = 0;
 957
 958         if (!is_fw_device(dev))
 959                 return 0;
 960
 961         down_read(&fw_device_rwsem); /* serialize config_rom access */
 962         spin_lock_irq(&card->lock);  /* serialize node access */
 963
 964         if (memcmp(old->config_rom, new->config_rom, 6 * 4) == 0 &&
 965             atomic_cmpxchg(&old->state,
 966                            FW_DEVICE_GONE,
 967                            FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
 968                 struct fw_node *current_node = new->node;
 969                 struct fw_node *obsolete_node = old->node;
 970
 971                 new->node = obsolete_node;
 972                 new->node->data = new;
 973                 old->node = current_node;
 974                 old->node->data = old;
 975
 976                 old->max_speed = new->max_speed;
 977                 old->node_id = current_node->node_id;
 978                 smp_wmb();  /* update node_id before generation */
 979                 old->generation = card->generation;
 980                 old->config_rom_retries = 0;
 981                 fw_notice(card, "rediscovered device %s\n", dev_name(dev));
 982
 983                 old->workfn = fw_device_update;
 984                 fw_schedule_device_work(old, 0);
 985
 986                 if (current_node == card->root_node)
 987                         fw_schedule_bm_work(card, 0);
 988
 989                 match = 1;
 990         }
 991
 992         spin_unlock_irq(&card->lock);
 993         up_read(&fw_device_rwsem);
 994
 995         return match;
 996 }
 997
 998 enum { BC_UNKNOWN = 0, BC_UNIMPLEMENTED, BC_IMPLEMENTED, };
 999
1000 static void set_broadcast_channel(struct fw_device *device, int generation)
1001 {
1002         struct fw_card *card = device->card;
1003         __be32 data;
1004         int rcode;
1005
1006         if (!card->broadcast_channel_allocated)
1007                 return;
1008
1009         /*
1010          * The Broadcast_Channel Valid bit is required by nodes which want to
1011          * transmit on this channel.  Such transmissions are practically
1012          * exclusive to IP over 1394 (RFC 2734).  IP capable nodes are required
1013          * to be IRM capable and have a max_rec of 8 or more.  We use this fact
1014          * to narrow down to which nodes we send Broadcast_Channel updates.
1015          */
1016         if (!device->irmc || device->max_rec < 8)
1017                 return;
1018
1019         /*
1020          * Some 1394-1995 nodes crash if this 1394a-2000 register is written.
1021          * Perform a read test first.
1022          */
1023         if (device->bc_implemented == BC_UNKNOWN) {
1024                 rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST,
1025                                 device->node_id, generation, device->max_speed,
1026                                 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
1027                                 &data, 4);
1028                 switch (rcode) {
1029                 case RCODE_COMPLETE:
1030                         if (data & cpu_to_be32(1 << 31)) {
1031                                 device->bc_implemented = BC_IMPLEMENTED;
1032                                 break;
1033                         }
1034                         fallthrough;    /* to case address error */
1035                 case RCODE_ADDRESS_ERROR:
1036                         device->bc_implemented = BC_UNIMPLEMENTED;
1037                 }
1038         }
1039
1040         if (device->bc_implemented == BC_IMPLEMENTED) {
1041                 data = cpu_to_be32(BROADCAST_CHANNEL_INITIAL |
1042                                    BROADCAST_CHANNEL_VALID);
1043                 fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST,
1044                                 device->node_id, generation, device->max_speed,
1045                                 CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL,
1046                                 &data, 4);
1047         }
1048 }
1049
1050 int fw_device_set_broadcast_channel(struct device *dev, void *gen)
1051 {
1052         if (is_fw_device(dev))
1053                 set_broadcast_channel(fw_device(dev), (long)gen);
1054
1055         return 0;
1056 }
1057
1058 static void fw_device_init(struct work_struct *work)
1059 {
1060         struct fw_device *device =
1061                 container_of(work, struct fw_device, work.work);
1062         struct fw_card *card = device->card;
1063         struct device *revived_dev;
1064         int minor, ret;
1065
1066         /*
1067          * All failure paths here set node->data to NULL, so that we
1068          * don't try to do device_for_each_child() on a kfree()'d
1069          * device.
1070          */
1071
1072         ret = read_config_rom(device, device->generation);
1073         if (ret != RCODE_COMPLETE) {
1074                 if (device->config_rom_retries < MAX_RETRIES &&
1075                     atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1076                         device->config_rom_retries++;
1077                         fw_schedule_device_work(device, RETRY_DELAY);
1078                 } else {
1079                         if (device->node->link_on)
1080                                 fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
1081                                           device->node_id,
1082                                           fw_rcode_string(ret));
1083                         if (device->node == card->root_node)
1084                                 fw_schedule_bm_work(card, 0);
1085                         fw_device_release(&device->device);
1086                 }
1087                 return;
1088         }
1089
1090         revived_dev = device_find_child(card->device,
1091                                         device, lookup_existing_device);
1092         if (revived_dev) {
1093                 put_device(revived_dev);
1094                 fw_device_release(&device->device);
1095
1096                 return;
1097         }
1098
1099         device_initialize(&device->device);
1100
1101         fw_device_get(device);
1102         down_write(&fw_device_rwsem);
1103         minor = idr_alloc(&fw_device_idr, device, 0, 1 << MINORBITS,
1104                         GFP_KERNEL);
1105         up_write(&fw_device_rwsem);
1106
1107         if (minor < 0)
1108                 goto error;
1109
1110         device->device.bus = &fw_bus_type;
1111         device->device.type = &fw_device_type;
1112         device->device.parent = card->device;
1113         device->device.devt = MKDEV(fw_cdev_major, minor);
1114         dev_set_name(&device->device, "fw%d", minor);
1115
1116         BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
1117                         ARRAY_SIZE(fw_device_attributes) +
1118                         ARRAY_SIZE(config_rom_attributes));
1119         init_fw_attribute_group(&device->device,
1120                                 fw_device_attributes,
1121                                 &device->attribute_group);
1122
1123         if (device_add(&device->device)) {
1124                 fw_err(card, "failed to add device\n");
1125                 goto error_with_cdev;
1126         }
1127
1128         create_units(device);
1129
1130         /*
1131          * Transition the device to running state.  If it got pulled
1132          * out from under us while we did the initialization work, we
1133          * have to shut down the device again here.  Normally, though,
1134          * fw_node_event will be responsible for shutting it down when
1135          * necessary.  We have to use the atomic cmpxchg here to avoid
1136          * racing with the FW_NODE_DESTROYED case in
1137          * fw_node_event().
1138          */
1139         if (atomic_cmpxchg(&device->state,
1140                            FW_DEVICE_INITIALIZING,
1141                            FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
1142                 device->workfn = fw_device_shutdown;
1143                 fw_schedule_device_work(device, SHUTDOWN_DELAY);
1144         } else {
1145                 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
1146                           dev_name(&device->device),
1147                           device->config_rom[3], device->config_rom[4],
1148                           1 << device->max_speed);
1149                 device->config_rom_retries = 0;
1150
1151                 set_broadcast_channel(device, device->generation);
1152
1153                 add_device_randomness(&device->config_rom[3], 8);
1154         }
1155
1156         /*
1157          * Reschedule the IRM work if we just finished reading the
1158          * root node config rom.  If this races with a bus reset we
1159          * just end up running the IRM work a couple of extra times -
1160          * pretty harmless.
1161          */
1162         if (device->node == card->root_node)
1163                 fw_schedule_bm_work(card, 0);
1164
1165         return;
1166
1167  error_with_cdev:
1168         down_write(&fw_device_rwsem);
1169         idr_remove(&fw_device_idr, minor);
1170         up_write(&fw_device_rwsem);
1171  error:
1172         fw_device_put(device);          /* fw_device_idr's reference */
1173
1174         put_device(&device->device);    /* our reference */
1175 }
1176
1177 /* Reread and compare bus info block and header of root directory */
1178 static int reread_config_rom(struct fw_device *device, int generation,
1179                              bool *changed)
1180 {
1181         u32 q;
1182         int i, rcode;
1183
1184         for (i = 0; i < 6; i++) {
1185                 rcode = read_rom(device, generation, i, &q);
1186                 if (rcode != RCODE_COMPLETE)
1187                         return rcode;
1188
1189                 if (i == 0 && q == 0)
1190                         /* inaccessible (see read_config_rom); retry later */
1191                         return RCODE_BUSY;
1192
1193                 if (q != device->config_rom[i]) {
1194                         *changed = true;
1195                         return RCODE_COMPLETE;
1196                 }
1197         }
1198
1199         *changed = false;
1200         return RCODE_COMPLETE;
1201 }
1202
1203 static void fw_device_refresh(struct work_struct *work)
1204 {
1205         struct fw_device *device =
1206                 container_of(work, struct fw_device, work.work);
1207         struct fw_card *card = device->card;
1208         int ret, node_id = device->node_id;
1209         bool changed;
1210
1211         ret = reread_config_rom(device, device->generation, &changed);
1212         if (ret != RCODE_COMPLETE)
1213                 goto failed_config_rom;
1214
1215         if (!changed) {
1216                 if (atomic_cmpxchg(&device->state,
1217                                    FW_DEVICE_INITIALIZING,
1218                                    FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1219                         goto gone;
1220
1221                 fw_device_update(work);
1222                 device->config_rom_retries = 0;
1223                 goto out;
1224         }
1225
1226         /*
1227          * Something changed.  We keep things simple and don't investigate
1228          * further.  We just destroy all previous units and create new ones.
1229          */
1230         device_for_each_child(&device->device, NULL, shutdown_unit);
1231
1232         ret = read_config_rom(device, device->generation);
1233         if (ret != RCODE_COMPLETE)
1234                 goto failed_config_rom;
1235
1236         fw_device_cdev_update(device);
1237         create_units(device);
1238
1239         /* Userspace may want to re-read attributes. */
1240         kobject_uevent(&device->device.kobj, KOBJ_CHANGE);
1241
1242         if (atomic_cmpxchg(&device->state,
1243                            FW_DEVICE_INITIALIZING,
1244                            FW_DEVICE_RUNNING) == FW_DEVICE_GONE)
1245                 goto gone;
1246
1247         fw_notice(card, "refreshed device %s\n", dev_name(&device->device));
1248         device->config_rom_retries = 0;
1249         goto out;
1250
1251  failed_config_rom:
1252         if (device->config_rom_retries < MAX_RETRIES &&
1253             atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
1254                 device->config_rom_retries++;
1255                 fw_schedule_device_work(device, RETRY_DELAY);
1256                 return;
1257         }
1258
1259         fw_notice(card, "giving up on refresh of device %s: %s\n",
1260                   dev_name(&device->device), fw_rcode_string(ret));
1261  gone:
1262         atomic_set(&device->state, FW_DEVICE_GONE);
1263         device->workfn = fw_device_shutdown;
1264         fw_schedule_device_work(device, SHUTDOWN_DELAY);
1265  out:
1266         if (node_id == card->root_node->node_id)
1267                 fw_schedule_bm_work(card, 0);
1268 }
1269
1270 static void fw_device_workfn(struct work_struct *work)
1271 {
1272         struct fw_device *device = container_of(to_delayed_work(work),
1273                                                 struct fw_device, work);
1274         device->workfn(work);
1275 }
1276
1277 void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
1278 {
1279         struct fw_device *device;
1280
1281         switch (event) {
1282         case FW_NODE_CREATED:
1283                 /*
1284                  * Attempt to scan the node, regardless whether its self ID has
1285                  * the L (link active) flag set or not.  Some broken devices
1286                  * send L=0 but have an up-and-running link; others send L=1
1287                  * without actually having a link.
1288                  */
1289  create:
1290                 device = kzalloc(sizeof(*device), GFP_ATOMIC);
1291                 if (device == NULL)
1292                         break;
1293
1294                 /*
1295                  * Do minimal initialization of the device here, the
1296                  * rest will happen in fw_device_init().
1297                  *
1298                  * Attention:  A lot of things, even fw_device_get(),
1299                  * cannot be done before fw_device_init() finished!
1300                  * You can basically just check device->state and
1301                  * schedule work until then, but only while holding
1302                  * card->lock.
1303                  */
1304                 atomic_set(&device->state, FW_DEVICE_INITIALIZING);
1305                 device->card = fw_card_get(card);
1306                 device->node = fw_node_get(node);
1307                 device->node_id = node->node_id;
1308                 device->generation = card->generation;
1309                 device->is_local = node == card->local_node;
1310                 mutex_init(&device->client_list_mutex);
1311                 INIT_LIST_HEAD(&device->client_list);
1312
1313                 /*
1314                  * Set the node data to point back to this device so
1315                  * FW_NODE_UPDATED callbacks can update the node_id
1316                  * and generation for the device.
1317                  */
1318                 node->data = device;
1319
1320                 /*
1321                  * Many devices are slow to respond after bus resets,
1322                  * especially if they are bus powered and go through
1323                  * power-up after getting plugged in.  We schedule the
1324                  * first config rom scan half a second after bus reset.
1325                  */
1326                 device->workfn = fw_device_init;
1327                 INIT_DELAYED_WORK(&device->work, fw_device_workfn);
1328                 fw_schedule_device_work(device, INITIAL_DELAY);
1329                 break;
1330
1331         case FW_NODE_INITIATED_RESET:
1332         case FW_NODE_LINK_ON:
1333                 device = node->data;
1334                 if (device == NULL)
1335                         goto create;
1336
1337                 device->node_id = node->node_id;
1338                 smp_wmb();  /* update node_id before generation */
1339                 device->generation = card->generation;
1340                 if (atomic_cmpxchg(&device->state,
1341                             FW_DEVICE_RUNNING,
1342                             FW_DEVICE_INITIALIZING) == FW_DEVICE_RUNNING) {
1343                         device->workfn = fw_device_refresh;
1344                         fw_schedule_device_work(device,
1345                                 device->is_local ? 0 : INITIAL_DELAY);
1346                 }
1347                 break;
1348
1349         case FW_NODE_UPDATED:
1350                 device = node->data;
1351                 if (device == NULL)
1352                         break;
1353
1354                 device->node_id = node->node_id;
1355                 smp_wmb();  /* update node_id before generation */
1356                 device->generation = card->generation;
1357                 if (atomic_read(&device->state) == FW_DEVICE_RUNNING) {
1358                         device->workfn = fw_device_update;
1359                         fw_schedule_device_work(device, 0);
1360                 }
1361                 break;
1362
1363         case FW_NODE_DESTROYED:
1364         case FW_NODE_LINK_OFF:
1365                 if (!node->data)
1366                         break;
1367
1368                 /*
1369                  * Destroy the device associated with the node.  There
1370                  * are two cases here: either the device is fully
1371                  * initialized (FW_DEVICE_RUNNING) or we're in the
1372                  * process of reading its config rom
1373                  * (FW_DEVICE_INITIALIZING).  If it is fully
1374                  * initialized we can reuse device->work to schedule a
1375                  * full fw_device_shutdown().  If not, there's work
1376                  * scheduled to read it's config rom, and we just put
1377                  * the device in shutdown state to have that code fail
1378                  * to create the device.
1379                  */
1380                 device = node->data;
1381                 if (atomic_xchg(&device->state,
1382                                 FW_DEVICE_GONE) == FW_DEVICE_RUNNING) {
1383                         device->workfn = fw_device_shutdown;
1384                         fw_schedule_device_work(device,
1385                                 list_empty(&card->link) ? 0 : SHUTDOWN_DELAY);
1386                 }
1387                 break;
1388         }
1389 }
1390
1391 #ifdef CONFIG_FIREWIRE_KUNIT_DEVICE_ATTRIBUTE_TEST
1392 #include "device-attribute-test.c"
1393 #endif