net/batman-adv/bat_sysfs.c

   1 /*
   2  * Copyright (C) 2010-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "bat_sysfs.h"
  24 #include "translation-table.h"
  25 #include "originator.h"
  26 #include "hard-interface.h"
  27 #include "gateway_common.h"
  28 #include "gateway_client.h"
  29 #include "vis.h"
  30
  31 static struct net_device *kobj_to_netdev(struct kobject *obj)
  32 {
  33         struct device *dev = container_of(obj->parent, struct device, kobj);
  34         return to_net_dev(dev);
  35 }
  36
  37 static struct bat_priv *kobj_to_batpriv(struct kobject *obj)
  38 {
  39         struct net_device *net_dev = kobj_to_netdev(obj);
  40         return netdev_priv(net_dev);
  41 }
  42
  43 /* Use this, if you have customized show and store functions */
  44 #define BAT_ATTR(_name, _mode, _show, _store)   \
  45 struct bat_attribute bat_attr_##_name = {       \
  46         .attr = {.name = __stringify(_name),    \
  47                  .mode = _mode },               \
  48         .show   = _show,                        \
  49         .store  = _store,                       \
  50 };
  51
  52 #define BAT_ATTR_STORE_BOOL(_name, _post_func)                          \
  53 ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,     \
  54                       char *buff, size_t count)                         \
  55 {                                                                       \
  56         struct net_device *net_dev = kobj_to_netdev(kobj);              \
  57         struct bat_priv *bat_priv = netdev_priv(net_dev);               \
  58         return __store_bool_attr(buff, count, _post_func, attr,         \
  59                                  &bat_priv->_name, net_dev);            \
  60 }
  61
  62 #define BAT_ATTR_SHOW_BOOL(_name)                                       \
  63 ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,      \
  64                             char *buff)                                 \
  65 {                                                                       \
  66         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);              \
  67         return sprintf(buff, "%s\n",                                    \
  68                        atomic_read(&bat_priv->_name) == 0 ?             \
  69                        "disabled" : "enabled");                         \
  70 }                                                                       \
  71
  72 /* Use this, if you are going to turn a [name] in bat_priv on or off */
  73 #define BAT_ATTR_BOOL(_name, _mode, _post_func)                         \
  74         static BAT_ATTR_STORE_BOOL(_name, _post_func)                   \
  75         static BAT_ATTR_SHOW_BOOL(_name)                                \
  76         static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
  77
  78
  79 #define BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)              \
  80 ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,     \
  81                              char *buff, size_t count)                  \
  82 {                                                                       \
  83         struct net_device *net_dev = kobj_to_netdev(kobj);              \
  84         struct bat_priv *bat_priv = netdev_priv(net_dev);               \
  85         return __store_uint_attr(buff, count, _min, _max, _post_func,   \
  86                                  attr, &bat_priv->_name, net_dev);      \
  87 }
  88
  89 #define BAT_ATTR_SHOW_UINT(_name)                                       \
  90 ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,      \
  91                             char *buff)                                 \
  92 {                                                                       \
  93         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);              \
  94         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name));    \
  95 }                                                                       \
  96
  97 /* Use this, if you are going to set [name] in bat_priv to unsigned integer
  98  * values only */
  99 #define BAT_ATTR_UINT(_name, _mode, _min, _max, _post_func)             \
 100         static BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)       \
 101         static BAT_ATTR_SHOW_UINT(_name)                                \
 102         static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
 103
 104
 105 static int store_bool_attr(char *buff, size_t count,
 106                            struct net_device *net_dev,
 107                            const char *attr_name, atomic_t *attr)
 108 {
 109         int enabled = -1;
 110
 111         if (buff[count - 1] == '\n')
 112                 buff[count - 1] = '\0';
 113
 114         if ((strncmp(buff, "1", 2) == 0) ||
 115             (strncmp(buff, "enable", 7) == 0) ||
 116             (strncmp(buff, "enabled", 8) == 0))
 117                 enabled = 1;
 118
 119         if ((strncmp(buff, "0", 2) == 0) ||
 120             (strncmp(buff, "disable", 8) == 0) ||
 121             (strncmp(buff, "disabled", 9) == 0))
 122                 enabled = 0;
 123
 124         if (enabled < 0) {
 125                 bat_info(net_dev,
 126                          "%s: Invalid parameter received: %s\n",
 127                          attr_name, buff);
 128                 return -EINVAL;
 129         }
 130
 131         if (atomic_read(attr) == enabled)
 132                 return count;
 133
 134         bat_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 135                  atomic_read(attr) == 1 ? "enabled" : "disabled",
 136                  enabled == 1 ? "enabled" : "disabled");
 137
 138         atomic_set(attr, (unsigned)enabled);
 139         return count;
 140 }
 141
 142 static inline ssize_t __store_bool_attr(char *buff, size_t count,
 143                         void (*post_func)(struct net_device *),
 144                         struct attribute *attr,
 145                         atomic_t *attr_store, struct net_device *net_dev)
 146 {
 147         int ret;
 148
 149         ret = store_bool_attr(buff, count, net_dev, attr->name, attr_store);
 150         if (post_func && ret)
 151                 post_func(net_dev);
 152
 153         return ret;
 154 }
 155
 156 static int store_uint_attr(const char *buff, size_t count,
 157                            struct net_device *net_dev, const char *attr_name,
 158                            unsigned int min, unsigned int max, atomic_t *attr)
 159 {
 160         unsigned long uint_val;
 161         int ret;
 162
 163         ret = strict_strtoul(buff, 10, &uint_val);
 164         if (ret) {
 165                 bat_info(net_dev,
 166                          "%s: Invalid parameter received: %s\n",
 167                          attr_name, buff);
 168                 return -EINVAL;
 169         }
 170
 171         if (uint_val < min) {
 172                 bat_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 173                          attr_name, uint_val, min);
 174                 return -EINVAL;
 175         }
 176
 177         if (uint_val > max) {
 178                 bat_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 179                          attr_name, uint_val, max);
 180                 return -EINVAL;
 181         }
 182
 183         if (atomic_read(attr) == uint_val)
 184                 return count;
 185
 186         bat_info(net_dev, "%s: Changing from: %i to: %lu\n",
 187                  attr_name, atomic_read(attr), uint_val);
 188
 189         atomic_set(attr, uint_val);
 190         return count;
 191 }
 192
 193 static inline ssize_t __store_uint_attr(const char *buff, size_t count,
 194                         int min, int max,
 195                         void (*post_func)(struct net_device *),
 196                         const struct attribute *attr,
 197                         atomic_t *attr_store, struct net_device *net_dev)
 198 {
 199         int ret;
 200
 201         ret = store_uint_attr(buff, count, net_dev, attr->name,
 202                               min, max, attr_store);
 203         if (post_func && ret)
 204                 post_func(net_dev);
 205
 206         return ret;
 207 }
 208
 209 static ssize_t show_vis_mode(struct kobject *kobj, struct attribute *attr,
 210                              char *buff)
 211 {
 212         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
 213         int vis_mode = atomic_read(&bat_priv->vis_mode);
 214
 215         return sprintf(buff, "%s\n",
 216                        vis_mode == VIS_TYPE_CLIENT_UPDATE ?
 217                                                         "client" : "server");
 218 }
 219
 220 static ssize_t store_vis_mode(struct kobject *kobj, struct attribute *attr,
 221                               char *buff, size_t count)
 222 {
 223         struct net_device *net_dev = kobj_to_netdev(kobj);
 224         struct bat_priv *bat_priv = netdev_priv(net_dev);
 225         unsigned long val;
 226         int ret, vis_mode_tmp = -1;
 227
 228         ret = strict_strtoul(buff, 10, &val);
 229
 230         if (((count == 2) && (!ret) && (val == VIS_TYPE_CLIENT_UPDATE)) ||
 231             (strncmp(buff, "client", 6) == 0) ||
 232             (strncmp(buff, "off", 3) == 0))
 233                 vis_mode_tmp = VIS_TYPE_CLIENT_UPDATE;
 234
 235         if (((count == 2) && (!ret) && (val == VIS_TYPE_SERVER_SYNC)) ||
 236             (strncmp(buff, "server", 6) == 0))
 237                 vis_mode_tmp = VIS_TYPE_SERVER_SYNC;
 238
 239         if (vis_mode_tmp < 0) {
 240                 if (buff[count - 1] == '\n')
 241                         buff[count - 1] = '\0';
 242
 243                 bat_info(net_dev,
 244                          "Invalid parameter for 'vis mode' setting received: "
 245                          "%s\n", buff);
 246                 return -EINVAL;
 247         }
 248
 249         if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp)
 250                 return count;
 251
 252         bat_info(net_dev, "Changing vis mode from: %s to: %s\n",
 253                  atomic_read(&bat_priv->vis_mode) == VIS_TYPE_CLIENT_UPDATE ?
 254                  "client" : "server", vis_mode_tmp == VIS_TYPE_CLIENT_UPDATE ?
 255                  "client" : "server");
 256
 257         atomic_set(&bat_priv->vis_mode, (unsigned)vis_mode_tmp);
 258         return count;
 259 }
 260
 261 static void post_gw_deselect(struct net_device *net_dev)
 262 {
 263         struct bat_priv *bat_priv = netdev_priv(net_dev);
 264         gw_deselect(bat_priv);
 265 }
 266
 267 static ssize_t show_gw_mode(struct kobject *kobj, struct attribute *attr,
 268                             char *buff)
 269 {
 270         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
 271         int bytes_written;
 272
 273         switch (atomic_read(&bat_priv->gw_mode)) {
 274         case GW_MODE_CLIENT:
 275                 bytes_written = sprintf(buff, "%s\n", GW_MODE_CLIENT_NAME);
 276                 break;
 277         case GW_MODE_SERVER:
 278                 bytes_written = sprintf(buff, "%s\n", GW_MODE_SERVER_NAME);
 279                 break;
 280         default:
 281                 bytes_written = sprintf(buff, "%s\n", GW_MODE_OFF_NAME);
 282                 break;
 283         }
 284
 285         return bytes_written;
 286 }
 287
 288 static ssize_t store_gw_mode(struct kobject *kobj, struct attribute *attr,
 289                              char *buff, size_t count)
 290 {
 291         struct net_device *net_dev = kobj_to_netdev(kobj);
 292         struct bat_priv *bat_priv = netdev_priv(net_dev);
 293         char *curr_gw_mode_str;
 294         int gw_mode_tmp = -1;
 295
 296         if (buff[count - 1] == '\n')
 297                 buff[count - 1] = '\0';
 298
 299         if (strncmp(buff, GW_MODE_OFF_NAME, strlen(GW_MODE_OFF_NAME)) == 0)
 300                 gw_mode_tmp = GW_MODE_OFF;
 301
 302         if (strncmp(buff, GW_MODE_CLIENT_NAME,
 303                    strlen(GW_MODE_CLIENT_NAME)) == 0)
 304                 gw_mode_tmp = GW_MODE_CLIENT;
 305
 306         if (strncmp(buff, GW_MODE_SERVER_NAME,
 307                    strlen(GW_MODE_SERVER_NAME)) == 0)
 308                 gw_mode_tmp = GW_MODE_SERVER;
 309
 310         if (gw_mode_tmp < 0) {
 311                 bat_info(net_dev,
 312                          "Invalid parameter for 'gw mode' setting received: "
 313                          "%s\n", buff);
 314                 return -EINVAL;
 315         }
 316
 317         if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
 318                 return count;
 319
 320         switch (atomic_read(&bat_priv->gw_mode)) {
 321         case GW_MODE_CLIENT:
 322                 curr_gw_mode_str = GW_MODE_CLIENT_NAME;
 323                 break;
 324         case GW_MODE_SERVER:
 325                 curr_gw_mode_str = GW_MODE_SERVER_NAME;
 326                 break;
 327         default:
 328                 curr_gw_mode_str = GW_MODE_OFF_NAME;
 329                 break;
 330         }
 331
 332         bat_info(net_dev, "Changing gw mode from: %s to: %s\n",
 333                  curr_gw_mode_str, buff);
 334
 335         gw_deselect(bat_priv);
 336         atomic_set(&bat_priv->gw_mode, (unsigned)gw_mode_tmp);
 337         return count;
 338 }
 339
 340 static ssize_t show_gw_bwidth(struct kobject *kobj, struct attribute *attr,
 341                               char *buff)
 342 {
 343         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
 344         int down, up;
 345         int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);
 346
 347         gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
 348         return sprintf(buff, "%i%s/%i%s\n",
 349                        (down > 2048 ? down / 1024 : down),
 350                        (down > 2048 ? "MBit" : "KBit"),
 351                        (up > 2048 ? up / 1024 : up),
 352                        (up > 2048 ? "MBit" : "KBit"));
 353 }
 354
 355 static ssize_t store_gw_bwidth(struct kobject *kobj, struct attribute *attr,
 356                                char *buff, size_t count)
 357 {
 358         struct net_device *net_dev = kobj_to_netdev(kobj);
 359
 360         if (buff[count - 1] == '\n')
 361                 buff[count - 1] = '\0';
 362
 363         return gw_bandwidth_set(net_dev, buff, count);
 364 }
 365
 366 BAT_ATTR_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 367 BAT_ATTR_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 368 BAT_ATTR_BOOL(fragmentation, S_IRUGO | S_IWUSR, update_min_mtu);
 369 static BAT_ATTR(vis_mode, S_IRUGO | S_IWUSR, show_vis_mode, store_vis_mode);
 370 static BAT_ATTR(gw_mode, S_IRUGO | S_IWUSR, show_gw_mode, store_gw_mode);
 371 BAT_ATTR_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * JITTER, INT_MAX, NULL);
 372 BAT_ATTR_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, TQ_MAX_VALUE, NULL);
 373 BAT_ATTR_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, TQ_MAX_VALUE,
 374               post_gw_deselect);
 375 static BAT_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, show_gw_bwidth,
 376                 store_gw_bwidth);
 377 #ifdef CONFIG_BATMAN_ADV_DEBUG
 378 BAT_ATTR_UINT(log_level, S_IRUGO | S_IWUSR, 0, 7, NULL);
 379 #endif
 380
 381 static struct bat_attribute *mesh_attrs[] = {
 382         &bat_attr_aggregated_ogms,
 383         &bat_attr_bonding,
 384         &bat_attr_fragmentation,
 385         &bat_attr_vis_mode,
 386         &bat_attr_gw_mode,
 387         &bat_attr_orig_interval,
 388         &bat_attr_hop_penalty,
 389         &bat_attr_gw_sel_class,
 390         &bat_attr_gw_bandwidth,
 391 #ifdef CONFIG_BATMAN_ADV_DEBUG
 392         &bat_attr_log_level,
 393 #endif
 394         NULL,
 395 };
 396
 397 int sysfs_add_meshif(struct net_device *dev)
 398 {
 399         struct kobject *batif_kobject = &dev->dev.kobj;
 400         struct bat_priv *bat_priv = netdev_priv(dev);
 401         struct bat_attribute **bat_attr;
 402         int err;
 403
 404         bat_priv->mesh_obj = kobject_create_and_add(SYSFS_IF_MESH_SUBDIR,
 405                                                     batif_kobject);
 406         if (!bat_priv->mesh_obj) {
 407                 bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 408                         SYSFS_IF_MESH_SUBDIR);
 409                 goto out;
 410         }
 411
 412         for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) {
 413                 err = sysfs_create_file(bat_priv->mesh_obj,
 414                                         &((*bat_attr)->attr));
 415                 if (err) {
 416                         bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 417                                 dev->name, SYSFS_IF_MESH_SUBDIR,
 418                                 ((*bat_attr)->attr).name);
 419                         goto rem_attr;
 420                 }
 421         }
 422
 423         return 0;
 424
 425 rem_attr:
 426         for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
 427                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 428
 429         kobject_put(bat_priv->mesh_obj);
 430         bat_priv->mesh_obj = NULL;
 431 out:
 432         return -ENOMEM;
 433 }
 434
 435 void sysfs_del_meshif(struct net_device *dev)
 436 {
 437         struct bat_priv *bat_priv = netdev_priv(dev);
 438         struct bat_attribute **bat_attr;
 439
 440         for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
 441                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 442
 443         kobject_put(bat_priv->mesh_obj);
 444         bat_priv->mesh_obj = NULL;
 445 }
 446
 447 static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr,
 448                                char *buff)
 449 {
 450         struct net_device *net_dev = kobj_to_netdev(kobj);
 451         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 452         ssize_t length;
 453
 454         if (!hard_iface)
 455                 return 0;
 456
 457         length = sprintf(buff, "%s\n", hard_iface->if_status == IF_NOT_IN_USE ?
 458                          "none" : hard_iface->soft_iface->name);
 459
 460         hardif_free_ref(hard_iface);
 461
 462         return length;
 463 }
 464
 465 static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
 466                                 char *buff, size_t count)
 467 {
 468         struct net_device *net_dev = kobj_to_netdev(kobj);
 469         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 470         int status_tmp = -1;
 471         int ret = count;
 472
 473         if (!hard_iface)
 474                 return count;
 475
 476         if (buff[count - 1] == '\n')
 477                 buff[count - 1] = '\0';
 478
 479         if (strlen(buff) >= IFNAMSIZ) {
 480                 pr_err("Invalid parameter for 'mesh_iface' setting received: "
 481                        "interface name too long '%s'\n", buff);
 482                 hardif_free_ref(hard_iface);
 483                 return -EINVAL;
 484         }
 485
 486         if (strncmp(buff, "none", 4) == 0)
 487                 status_tmp = IF_NOT_IN_USE;
 488         else
 489                 status_tmp = IF_I_WANT_YOU;
 490
 491         if (hard_iface->if_status == status_tmp)
 492                 goto out;
 493
 494         if ((hard_iface->soft_iface) &&
 495             (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
 496                 goto out;
 497
 498         if (!rtnl_trylock()) {
 499                 ret = -ERESTARTSYS;
 500                 goto out;
 501         }
 502
 503         if (status_tmp == IF_NOT_IN_USE) {
 504                 hardif_disable_interface(hard_iface);
 505                 goto unlock;
 506         }
 507
 508         /* if the interface already is in use */
 509         if (hard_iface->if_status != IF_NOT_IN_USE)
 510                 hardif_disable_interface(hard_iface);
 511
 512         ret = hardif_enable_interface(hard_iface, buff);
 513
 514 unlock:
 515         rtnl_unlock();
 516 out:
 517         hardif_free_ref(hard_iface);
 518         return ret;
 519 }
 520
 521 static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
 522                                  char *buff)
 523 {
 524         struct net_device *net_dev = kobj_to_netdev(kobj);
 525         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 526         ssize_t length;
 527
 528         if (!hard_iface)
 529                 return 0;
 530
 531         switch (hard_iface->if_status) {
 532         case IF_TO_BE_REMOVED:
 533                 length = sprintf(buff, "disabling\n");
 534                 break;
 535         case IF_INACTIVE:
 536                 length = sprintf(buff, "inactive\n");
 537                 break;
 538         case IF_ACTIVE:
 539                 length = sprintf(buff, "active\n");
 540                 break;
 541         case IF_TO_BE_ACTIVATED:
 542                 length = sprintf(buff, "enabling\n");
 543                 break;
 544         case IF_NOT_IN_USE:
 545         default:
 546                 length = sprintf(buff, "not in use\n");
 547                 break;
 548         }
 549
 550         hardif_free_ref(hard_iface);
 551
 552         return length;
 553 }
 554
 555 static BAT_ATTR(mesh_iface, S_IRUGO | S_IWUSR,
 556                 show_mesh_iface, store_mesh_iface);
 557 static BAT_ATTR(iface_status, S_IRUGO, show_iface_status, NULL);
 558
 559 static struct bat_attribute *batman_attrs[] = {
 560         &bat_attr_mesh_iface,
 561         &bat_attr_iface_status,
 562         NULL,
 563 };
 564
 565 int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
 566 {
 567         struct kobject *hardif_kobject = &dev->dev.kobj;
 568         struct bat_attribute **bat_attr;
 569         int err;
 570
 571         *hardif_obj = kobject_create_and_add(SYSFS_IF_BAT_SUBDIR,
 572                                                     hardif_kobject);
 573
 574         if (!*hardif_obj) {
 575                 bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 576                         SYSFS_IF_BAT_SUBDIR);
 577                 goto out;
 578         }
 579
 580         for (bat_attr = batman_attrs; *bat_attr; ++bat_attr) {
 581                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
 582                 if (err) {
 583                         bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 584                                 dev->name, SYSFS_IF_BAT_SUBDIR,
 585                                 ((*bat_attr)->attr).name);
 586                         goto rem_attr;
 587                 }
 588         }
 589
 590         return 0;
 591
 592 rem_attr:
 593         for (bat_attr = batman_attrs; *bat_attr; ++bat_attr)
 594                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
 595 out:
 596         return -ENOMEM;
 597 }
 598
 599 void sysfs_del_hardif(struct kobject **hardif_obj)
 600 {
 601         kobject_put(*hardif_obj);
 602         *hardif_obj = NULL;
 603 }