util-linux/mdev.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * mdev - Mini udev for busybox
   4  *
   5  * Copyright 2005 Rob Landley <rob@landley.net>
   6  * Copyright 2005 Frank Sorenson <frank@tuxrocks.com>
   7  *
   8  * Licensed under GPL version 2, see file LICENSE in this tarball for details.
   9  */
  10 #include "libbb.h"
  11 #include "xregex.h"
  12
  13 /* "mdev -s" scans /sys/class/xxx, looking for directories which have dev
  14  * file (it is of the form "M:m\n"). Example: /sys/class/tty/tty0/dev
  15  * contains "4:0\n". Directory name is taken as device name, path component
  16  * directly after /sys/class/ as subsystem. In this example, "tty0" and "tty".
  17  * Then mdev creates the /dev/device_name node.
  18  * If /sys/class/.../dev file does not exist, mdev still may act
  19  * on this device: see "@|$|*command args..." parameter in config file.
  20  *
  21  * mdev w/o parameters is called as hotplug helper. It takes device
  22  * and subsystem names from $DEVPATH and $SUBSYSTEM, extracts
  23  * maj,min from "/sys/$DEVPATH/dev" and also examines
  24  * $ACTION ("add"/"delete") and $FIRMWARE.
  25  *
  26  * If action is "add", mdev creates /dev/device_name similarly to mdev -s.
  27  * (todo: explain "delete" and $FIRMWARE)
  28  *
  29  * If /etc/mdev.conf exists, it may modify /dev/device_name's properties.
  30  * /etc/mdev.conf file format:
  31  *
  32  * [-][subsystem/]device  user:grp  mode  [>|=path] [@|$|*command args...]
  33  * [-]@maj,min[-min2]     user:grp  mode  [>|=path] [@|$|*command args...]
  34  * [-]$envvar=val         user:grp  mode  [>|=path] [@|$|*command args...]
  35  *
  36  * Leading minus in 1st field means "don't stop on this line", otherwise
  37  * search is stopped after the matching line is encountered.
  38  *
  39  * The device name or "subsystem/device" combo is matched against 1st field
  40  * (which is a regex), or maj,min is matched against 1st field,
  41  * or specified environment variable (as regex) is matched against 1st field.
  42  *
  43  * $envvar=val format is useful for loading modules for hot-plugged devices
  44  * which do not have driver loaded yet. In this case /sys/class/.../dev
  45  * does not exist, but $MODALIAS is set to needed module's name
  46  * (actually, an alias to it) by kernel. This rule instructs mdev
  47  * to load the module and exit:
  48  *    $MODALIAS=.* 0:0 660 @modprobe "$MODALIAS"
  49  * The kernel will generate another hotplug event when /sys/class/.../dev
  50  * file appears.
  51  *
  52  * When line matches, the device node is created, chmod'ed and chown'ed,
  53  * moved to path, and if >path, a symlink to moved node is created,
  54  * all this if /sys/class/.../dev exists.
  55  *    Examples:
  56  *    =loop/      - moves to /dev/loop
  57  *    >disk/sda%1 - moves to /dev/disk/sdaN, makes /dev/sdaN a symlink
  58  *
  59  * Then "command args..." is executed (via sh -c 'command args...').
  60  * @:execute on creation, $:on deletion, *:on both.
  61  * This happens regardless of /sys/class/.../dev existence.
  62  */
  63
  64 struct globals {
  65         int root_major, root_minor;
  66         char *subsystem;
  67 } FIX_ALIASING;
  68 #define G (*(struct globals*)&bb_common_bufsiz1)
  69
  70 /* Prevent infinite loops in /sys symlinks */
  71 #define MAX_SYSFS_DEPTH 3
  72
  73 /* We use additional 64+ bytes in make_device() */
  74 #define SCRATCH_SIZE 80
  75
  76 /* Builds an alias path.
  77  * This function potentionally reallocates the alias parameter.
  78  * Only used for ENABLE_FEATURE_MDEV_RENAME
  79  */
  80 static char *build_alias(char *alias, const char *device_name)
  81 {
  82         char *dest;
  83
  84         /* ">bar/": rename to bar/device_name */
  85         /* ">bar[/]baz": rename to bar[/]baz */
  86         dest = strrchr(alias, '/');
  87         if (dest) { /* ">bar/[baz]" ? */
  88                 *dest = '\0'; /* mkdir bar */
  89                 bb_make_directory(alias, 0755, FILEUTILS_RECUR);
  90                 *dest = '/';
  91                 if (dest[1] == '\0') { /* ">bar/" => ">bar/device_name" */
  92                         dest = alias;
  93                         alias = concat_path_file(alias, device_name);
  94                         free(dest);
  95                 }
  96         }
  97
  98         return alias;
  99 }
 100
 101 /* mknod in /dev based on a path like "/sys/block/hda/hda1"
 102  * NB1: path parameter needs to have SCRATCH_SIZE scratch bytes
 103  * after NUL, but we promise to not mangle (IOW: to restore if needed)
 104  * path string.
 105  * NB2: "mdev -s" may call us many times, do not leak memory/fds!
 106  */
 107 static void make_device(char *path, int delete)
 108 {
 109         char *device_name, *subsystem_slash_devname;
 110         int major, minor, type, len;
 111         mode_t mode;
 112         parser_t *parser;
 113
 114         /* Try to read major/minor string.  Note that the kernel puts \n after
 115          * the data, so we don't need to worry about null terminating the string
 116          * because sscanf() will stop at the first nondigit, which \n is.
 117          * We also depend on path having writeable space after it.
 118          */
 119         major = -1;
 120         if (!delete) {
 121                 char *dev_maj_min = path + strlen(path);
 122
 123                 strcpy(dev_maj_min, "/dev");
 124                 len = open_read_close(path, dev_maj_min + 1, 64);
 125                 *dev_maj_min = '\0';
 126                 if (len < 1) {
 127                         if (!ENABLE_FEATURE_MDEV_EXEC)
 128                                 return;
 129                         /* no "dev" file, but we can still run scripts
 130                          * based on device name */
 131                 } else if (sscanf(++dev_maj_min, "%u:%u", &major, &minor) != 2) {
 132                         major = -1;
 133                 }
 134         }
 135
 136         /* Determine device name, type, major and minor */
 137         device_name = (char*) bb_basename(path);
 138         /* http://kernel.org/doc/pending/hotplug.txt says that only
 139          * "/sys/block/..." is for block devices. "/sys/bus" etc is not.
 140          * But since 2.6.25 block devices are also in /sys/class/block.
 141          * We use strstr("/block/") to forestall future surprises. */
 142         type = S_IFCHR;
 143         if (strstr(path, "/block/") || (G.subsystem && strncmp(G.subsystem, "block", 5) == 0))
 144                 type = S_IFBLK;
 145
 146         /* Make path point to "subsystem/device_name" */
 147         subsystem_slash_devname = NULL;
 148         /* Check for coldplug invocations first */
 149         if (strncmp(path, "/sys/block/", 11) == 0) /* legacy case */
 150                 path += sizeof("/sys/") - 1;
 151         else if (strncmp(path, "/sys/class/", 11) == 0)
 152                 path += sizeof("/sys/class/") - 1;
 153         else {
 154                 /* Example of a hotplug invocation:
 155                  * SUBSYSTEM="block"
 156                  * DEVPATH="/sys" + "/devices/virtual/mtd/mtd3/mtdblock3"
 157                  * ("/sys" is added by mdev_main)
 158                  * - path does not contain subsystem
 159                  */
 160                 subsystem_slash_devname = concat_path_file(G.subsystem, device_name);
 161                 path = subsystem_slash_devname;
 162         }
 163
 164         /* If we have config file, look up user settings */
 165         if (ENABLE_FEATURE_MDEV_CONF)
 166                 parser = config_open2("/etc/mdev.conf", fopen_for_read);
 167
 168         do {
 169                 int keep_matching;
 170                 struct bb_uidgid_t ugid;
 171                 char *tokens[4];
 172                 char *command = NULL;
 173                 char *alias = NULL;
 174                 char aliaslink = aliaslink; /* for compiler */
 175
 176                 /* Defaults in case we won't match any line */
 177                 ugid.uid = ugid.gid = 0;
 178                 keep_matching = 0;
 179                 mode = 0660;
 180
 181                 if (ENABLE_FEATURE_MDEV_CONF
 182                  && config_read(parser, tokens, 4, 3, "# \t", PARSE_NORMAL)
 183                 ) {
 184                         char *val;
 185                         char *str_to_match;
 186                         regmatch_t off[1 + 9 * ENABLE_FEATURE_MDEV_RENAME_REGEXP];
 187
 188                         val = tokens[0];
 189                         keep_matching = ('-' == val[0]);
 190                         val += keep_matching; /* swallow leading dash */
 191
 192                         /* Match against either "subsystem/device_name"
 193                          * or "device_name" alone */
 194                         str_to_match = strchr(val, '/') ? path : device_name;
 195
 196                         /* Fields: regex uid:gid mode [alias] [cmd] */
 197
 198                         if (val[0] == '@') {
 199                                 /* @major,minor[-minor2] */
 200                                 /* (useful when name is ambiguous:
 201                                  * "/sys/class/usb/lp0" and
 202                                  * "/sys/class/printer/lp0") */
 203                                 int cmaj, cmin0, cmin1, sc;
 204                                 if (major < 0)
 205                                         continue; /* no dev, no match */
 206                                 sc = sscanf(val, "@%u,%u-%u", &cmaj, &cmin0, &cmin1);
 207                                 if (sc < 1 || major != cmaj
 208                                  || (sc == 2 && minor != cmin0)
 209                                  || (sc == 3 && (minor < cmin0 || minor > cmin1))
 210                                 ) {
 211                                         continue; /* this line doesn't match */
 212                                 }
 213                                 goto line_matches;
 214                         }
 215                         if (val[0] == '$') {
 216                                 /* regex to match an environment variable */
 217                                 char *eq = strchr(++val, '=');
 218                                 if (!eq)
 219                                         continue;
 220                                 *eq = '\0';
 221                                 str_to_match = getenv(val);
 222                                 if (!str_to_match)
 223                                         continue;
 224                                 str_to_match -= strlen(val) + 1;
 225                                 *eq = '=';
 226                         }
 227                         /* else: regex to match [subsystem/]device_name */
 228
 229                         {
 230                                 regex_t match;
 231                                 int result;
 232
 233                                 xregcomp(&match, val, REG_EXTENDED);
 234                                 result = regexec(&match, str_to_match, ARRAY_SIZE(off), off, 0);
 235                                 regfree(&match);
 236                                 //bb_error_msg("matches:");
 237                                 //for (int i = 0; i < ARRAY_SIZE(off); i++) {
 238                                 //      if (off[i].rm_so < 0) continue;
 239                                 //      bb_error_msg("match %d: '%.*s'\n", i,
 240                                 //              (int)(off[i].rm_eo - off[i].rm_so),
 241                                 //              device_name + off[i].rm_so);
 242                                 //}
 243
 244                                 /* If no match, skip rest of line */
 245                                 /* (regexec returns whole pattern as "range" 0) */
 246                                 if (result || off[0].rm_so
 247                                  || ((int)off[0].rm_eo != (int)strlen(str_to_match))
 248                                 ) {
 249                                         continue; /* this line doesn't match */
 250                                 }
 251                         }
 252  line_matches:
 253                         /* This line matches. Stop parsing after parsing
 254                          * the rest the line unless keep_matching == 1 */
 255
 256                         /* 2nd field: uid:gid - device ownership */
 257                         if (get_uidgid(&ugid, tokens[1], 1) == 0)
 258                                 bb_error_msg("unknown user/group %s on line %d", tokens[1], parser->lineno);
 259
 260                         /* 3rd field: mode - device permissions */
 261                         /* mode = strtoul(tokens[2], NULL, 8); */
 262                         bb_parse_mode(tokens[2], &mode);
 263
 264                         val = tokens[3];
 265                         /* 4th field (opt): >|=alias */
 266
 267                         if (ENABLE_FEATURE_MDEV_RENAME && val) {
 268                                 aliaslink = val[0];
 269                                 if (aliaslink == '>' || aliaslink == '=') {
 270                                         char *a, *s, *st;
 271                                         char *p;
 272                                         unsigned i, n;
 273
 274                                         a = val;
 275                                         s = strchrnul(val, ' ');
 276                                         st = strchrnul(val, '\t');
 277                                         if (st < s)
 278                                                 s = st;
 279                                         val = (s[0] && s[1]) ? s+1 : NULL;
 280                                         s[0] = '\0';
 281
 282                                         if (ENABLE_FEATURE_MDEV_RENAME_REGEXP) {
 283                                                 /* substitute %1..9 with off[1..9], if any */
 284                                                 n = 0;
 285                                                 s = a;
 286                                                 while (*s)
 287                                                         if (*s++ == '%')
 288                                                                 n++;
 289
 290                                                 p = alias = xzalloc(strlen(a) + n * strlen(str_to_match));
 291                                                 s = a + 1;
 292                                                 while (*s) {
 293                                                         *p = *s;
 294                                                         if ('%' == *s) {
 295                                                                 i = (s[1] - '0');
 296                                                                 if (i <= 9 && off[i].rm_so >= 0) {
 297                                                                         n = off[i].rm_eo - off[i].rm_so;
 298                                                                         strncpy(p, str_to_match + off[i].rm_so, n);
 299                                                                         p += n - 1;
 300                                                                         s++;
 301                                                                 }
 302                                                         }
 303                                                         p++;
 304                                                         s++;
 305                                                 }
 306                                         } else {
 307                                                 alias = xstrdup(a + 1);
 308                                         }
 309                                 }
 310                         }
 311
 312                         if (ENABLE_FEATURE_MDEV_EXEC && val) {
 313                                 const char *s = "$@*";
 314                                 const char *s2 = strchr(s, val[0]);
 315
 316                                 if (!s2) {
 317                                         bb_error_msg("bad line %u", parser->lineno);
 318                                         if (ENABLE_FEATURE_MDEV_RENAME)
 319                                                 free(alias);
 320                                         continue;
 321                                 }
 322
 323                                 /* Are we running this command now?
 324                                  * Run $cmd on delete, @cmd on create, *cmd on both
 325                                  */
 326                                 if (s2-s != delete)
 327                                         command = xstrdup(val + 1);
 328                         }
 329                 }
 330
 331                 /* End of field parsing */
 332
 333                 /* "Execute" the line we found */
 334                 {
 335                         const char *node_name;
 336
 337                         node_name = device_name;
 338                         if (ENABLE_FEATURE_MDEV_RENAME && alias)
 339                                 node_name = alias = build_alias(alias, device_name);
 340
 341                         if (!delete && major >= 0) {
 342                                 if (mknod(node_name, mode | type, makedev(major, minor)) && errno != EEXIST)
 343                                         bb_perror_msg("can't create %s", node_name);
 344                                 if (major == G.root_major && minor == G.root_minor)
 345                                         symlink(node_name, "root");
 346                                 if (ENABLE_FEATURE_MDEV_CONF) {
 347                                         chmod(node_name, mode);
 348                                         chown(node_name, ugid.uid, ugid.gid);
 349                                 }
 350                                 if (ENABLE_FEATURE_MDEV_RENAME && alias) {
 351                                         if (aliaslink == '>')
 352                                                 symlink(node_name, device_name);
 353                                 }
 354                         }
 355
 356                         if (ENABLE_FEATURE_MDEV_EXEC && command) {
 357                                 /* setenv will leak memory, use putenv/unsetenv/free */
 358                                 char *s = xasprintf("%s=%s", "MDEV", node_name);
 359                                 char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
 360                                 putenv(s);
 361                                 putenv(s1);
 362                                 if (system(command) == -1)
 363                                         bb_perror_msg("can't run '%s'", command);
 364                                 unsetenv("SUBSYSTEM");
 365                                 free(s1);
 366                                 unsetenv("MDEV");
 367                                 free(s);
 368                                 free(command);
 369                         }
 370
 371                         if (delete) {
 372                                 if (ENABLE_FEATURE_MDEV_RENAME && alias) {
 373                                         if (aliaslink == '>')
 374                                                 unlink(device_name);
 375                                 }
 376                                 unlink(node_name);
 377                         }
 378
 379                         if (ENABLE_FEATURE_MDEV_RENAME)
 380                                 free(alias);
 381                 }
 382
 383                 /* We found matching line.
 384                  * Stop unless it was prefixed with '-' */
 385                 if (ENABLE_FEATURE_MDEV_CONF && !keep_matching)
 386                         break;
 387
 388         /* end of "while line is read from /etc/mdev.conf" */
 389         } while (ENABLE_FEATURE_MDEV_CONF);
 390
 391         if (ENABLE_FEATURE_MDEV_CONF)
 392                 config_close(parser);
 393         free(subsystem_slash_devname);
 394 }
 395
 396 /* File callback for /sys/ traversal */
 397 static int FAST_FUNC fileAction(const char *fileName,
 398                 struct stat *statbuf UNUSED_PARAM,
 399                 void *userData,
 400                 int depth UNUSED_PARAM)
 401 {
 402         size_t len = strlen(fileName) - 4; /* can't underflow */
 403         char *scratch = userData;
 404
 405         /* len check is for paranoid reasons */
 406         if (strcmp(fileName + len, "/dev") != 0 || len >= PATH_MAX)
 407                 return FALSE;
 408
 409         strcpy(scratch, fileName);
 410         scratch[len] = '\0';
 411         make_device(scratch, /*delete:*/ 0);
 412
 413         return TRUE;
 414 }
 415
 416 /* Directory callback for /sys/ traversal */
 417 static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
 418                 struct stat *statbuf UNUSED_PARAM,
 419                 void *userData UNUSED_PARAM,
 420                 int depth)
 421 {
 422         /* Extract device subsystem -- the name of the directory
 423          * under /sys/class/ */
 424         if (1 == depth) {
 425                 free(G.subsystem);
 426                 G.subsystem = strrchr(fileName, '/');
 427                 if (G.subsystem)
 428                         G.subsystem = xstrdup(G.subsystem + 1);
 429         }
 430
 431         return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
 432 }
 433
 434 /* For the full gory details, see linux/Documentation/firmware_class/README
 435  *
 436  * Firmware loading works like this:
 437  * - kernel sets FIRMWARE env var
 438  * - userspace checks /lib/firmware/$FIRMWARE
 439  * - userspace waits for /sys/$DEVPATH/loading to appear
 440  * - userspace writes "1" to /sys/$DEVPATH/loading
 441  * - userspace copies /lib/firmware/$FIRMWARE into /sys/$DEVPATH/data
 442  * - userspace writes "0" (worked) or "-1" (failed) to /sys/$DEVPATH/loading
 443  * - kernel loads firmware into device
 444  */
 445 static void load_firmware(const char *firmware, const char *sysfs_path)
 446 {
 447         int cnt;
 448         int firmware_fd, loading_fd, data_fd;
 449
 450         /* check for /lib/firmware/$FIRMWARE */
 451         xchdir("/lib/firmware");
 452         firmware_fd = xopen(firmware, O_RDONLY);
 453
 454         /* in case we goto out ... */
 455         data_fd = -1;
 456
 457         /* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
 458         xchdir(sysfs_path);
 459         for (cnt = 0; cnt < 30; ++cnt) {
 460                 loading_fd = open("loading", O_WRONLY);
 461                 if (loading_fd != -1)
 462                         goto loading;
 463                 sleep(1);
 464         }
 465         goto out;
 466
 467  loading:
 468         /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
 469         if (full_write(loading_fd, "1", 1) != 1)
 470                 goto out;
 471
 472         /* load firmware into /sys/$DEVPATH/data */
 473         data_fd = open("data", O_WRONLY);
 474         if (data_fd == -1)
 475                 goto out;
 476         cnt = bb_copyfd_eof(firmware_fd, data_fd);
 477
 478         /* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */
 479         if (cnt > 0)
 480                 full_write(loading_fd, "0", 1);
 481         else
 482                 full_write(loading_fd, "-1", 2);
 483
 484  out:
 485         if (ENABLE_FEATURE_CLEAN_UP) {
 486                 close(firmware_fd);
 487                 close(loading_fd);
 488                 close(data_fd);
 489         }
 490 }
 491
 492 int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 493 int mdev_main(int argc UNUSED_PARAM, char **argv)
 494 {
 495         RESERVE_CONFIG_BUFFER(temp, PATH_MAX + SCRATCH_SIZE);
 496
 497         /* We can be called as hotplug helper */
 498         /* Kernel cannot provide suitable stdio fds for us, do it ourself */
 499         bb_sanitize_stdio();
 500
 501         /* Force the configuration file settings exactly */
 502         umask(0);
 503
 504         xchdir("/dev");
 505
 506         if (argv[1] && strcmp(argv[1], "-s") == 0) {
 507                 /* Scan:
 508                  * mdev -s
 509                  */
 510                 struct stat st;
 511
 512                 xstat("/", &st);
 513                 G.root_major = major(st.st_dev);
 514                 G.root_minor = minor(st.st_dev);
 515
 516                 /* ACTION_FOLLOWLINKS is needed since in newer kernels
 517                  * /sys/block/loop* (for example) are symlinks to dirs,
 518                  * not real directories.
 519                  * (kernel's CONFIG_SYSFS_DEPRECATED makes them real dirs,
 520                  * but we can't enforce that on users)
 521                  */
 522                 if (access("/sys/class/block", F_OK) != 0) {
 523                         /* Scan obsolete /sys/block only if /sys/class/block
 524                          * doesn't exist. Otherwise we'll have dupes.
 525                          * Also, do not complain if it doesn't exist.
 526                          * Some people configure kernel to have no blockdevs.
 527                          */
 528                         recursive_action("/sys/block",
 529                                 ACTION_RECURSE | ACTION_FOLLOWLINKS | ACTION_QUIET,
 530                                 fileAction, dirAction, temp, 0);
 531                 }
 532                 recursive_action("/sys/class",
 533                         ACTION_RECURSE | ACTION_FOLLOWLINKS,
 534                         fileAction, dirAction, temp, 0);
 535         } else {
 536                 char *fw;
 537                 char *seq;
 538                 char *action;
 539                 char *env_path;
 540                 static const char keywords[] ALIGN1 = "remove\0add\0";
 541                 enum { OP_remove = 0, OP_add };
 542                 smalluint op;
 543
 544                 /* Hotplug:
 545                  * env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
 546                  * ACTION can be "add" or "remove"
 547                  * DEVPATH is like "/block/sda" or "/class/input/mice"
 548                  */
 549                 action = getenv("ACTION");
 550                 env_path = getenv("DEVPATH");
 551                 G.subsystem = getenv("SUBSYSTEM");
 552                 if (!action || !env_path /*|| !G.subsystem*/)
 553                         bb_show_usage();
 554                 fw = getenv("FIRMWARE");
 555                 op = index_in_strings(keywords, action);
 556                 /* If it exists, does /dev/mdev.seq match $SEQNUM?
 557                  * If it does not match, earlier mdev is running
 558                  * in parallel, and we need to wait */
 559                 seq = getenv("SEQNUM");
 560                 if (seq) {
 561                         int timeout = 2000 / 32; /* 2000 msec */
 562                         do {
 563                                 int seqlen;
 564                                 char seqbuf[sizeof(int)*3 + 2];
 565
 566                                 seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf-1));
 567                                 if (seqlen < 0) {
 568                                         seq = NULL;
 569                                         break;
 570                                 }
 571                                 seqbuf[seqlen] = '\0';
 572                                 if (seqbuf[0] == '\n' /* seed file? */
 573                                  || strcmp(seq, seqbuf) == 0 /* correct idx? */
 574                                 ) {
 575                                         break;
 576                                 }
 577                                 usleep(32*1000);
 578                         } while (--timeout);
 579                 }
 580
 581                 snprintf(temp, PATH_MAX, "/sys%s", env_path);
 582                 if (op == OP_remove) {
 583                         /* Ignoring "remove firmware". It was reported
 584                          * to happen and to cause erroneous deletion
 585                          * of device nodes. */
 586                         if (!fw)
 587                                 make_device(temp, /*delete:*/ 1);
 588                 }
 589                 else if (op == OP_add) {
 590                         make_device(temp, /*delete:*/ 0);
 591                         if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
 592                                 if (fw)
 593                                         load_firmware(fw, temp);
 594                         }
 595                 }
 596
 597                 if (seq) {
 598                         xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
 599                 }
 600         }
 601
 602         if (ENABLE_FEATURE_CLEAN_UP)
 603                 RELEASE_CONFIG_BUFFER(temp);
 604
 605         return EXIT_SUCCESS;
 606 }