net/wimax/stack.c

   1 /*
   2  * Linux WiMAX
   3  * Initialization, addition and removal of wimax devices
   4  *
   5  *
   6  * Copyright (C) 2005-2006 Intel Corporation <linux-wimax@intel.com>
   7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License version
  11  * 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301, USA.
  22  *
  23  *
  24  * This implements:
  25  *
  26  *   - basic life cycle of 'struct wimax_dev' [wimax_dev_*()]; on
  27  *     addition/registration initialize all subfields and allocate
  28  *     generic netlink resources for user space communication. On
  29  *     removal/unregistration, undo all that.
  30  *
  31  *   - device state machine [wimax_state_change()] and support to send
  32  *     reports to user space when the state changes
  33  *     [wimax_gnl_re_state_change*()].
  34  *
  35  * See include/net/wimax.h for rationales and design.
  36  *
  37  * ROADMAP
  38  *
  39  * [__]wimax_state_change()     Called by drivers to update device's state
  40  *   wimax_gnl_re_state_change_alloc()
  41  *   wimax_gnl_re_state_change_send()
  42  *
  43  * wimax_dev_init()             Init a device
  44  * wimax_dev_add()              Register
  45  *   wimax_rfkill_add()
  46  *   wimax_gnl_add()            Register all the generic netlink resources.
  47  *   wimax_id_table_add()
  48  * wimax_dev_rm()               Unregister
  49  *   wimax_id_table_rm()
  50  *   wimax_gnl_rm()
  51  *   wimax_rfkill_rm()
  52  */
  53 #include <linux/device.h>
  54 #include <linux/gfp.h>
  55 #include <net/genetlink.h>
  56 #include <linux/netdevice.h>
  57 #include <linux/wimax.h>
  58 #include <linux/module.h>
  59 #include "wimax-internal.h"
  60
  61
  62 #define D_SUBMODULE stack
  63 #include "debug-levels.h"
  64
  65 static char wimax_debug_params[128];
  66 module_param_string(debug, wimax_debug_params, sizeof(wimax_debug_params),
  67                     0644);
  68 MODULE_PARM_DESC(debug,
  69                  "String of space-separated NAME:VALUE pairs, where NAMEs "
  70                  "are the different debug submodules and VALUE are the "
  71                  "initial debug value to set.");
  72
  73 /*
  74  * Authoritative source for the RE_STATE_CHANGE attribute policy
  75  *
  76  * We don't really use it here, but /me likes to keep the definition
  77  * close to where the data is generated.
  78  */
  79 /*
  80 static const struct nla_policy wimax_gnl_re_status_change[WIMAX_GNL_ATTR_MAX + 1] = {
  81         [WIMAX_GNL_STCH_STATE_OLD] = { .type = NLA_U8 },
  82         [WIMAX_GNL_STCH_STATE_NEW] = { .type = NLA_U8 },
  83 };
  84 */
  85
  86
  87 /*
  88  * Allocate a Report State Change message
  89  *
  90  * @header: save it, you need it for _send()
  91  *
  92  * Creates and fills a basic state change message; different code
  93  * paths can then add more attributes to the message as needed.
  94  *
  95  * Use wimax_gnl_re_state_change_send() to send the returned skb.
  96  *
  97  * Returns: skb with the genl message if ok, IS_ERR() ptr on error
  98  *     with an errno code.
  99  */
 100 static
 101 struct sk_buff *wimax_gnl_re_state_change_alloc(
 102         struct wimax_dev *wimax_dev,
 103         enum wimax_st new_state, enum wimax_st old_state,
 104         void **header)
 105 {
 106         int result;
 107         struct device *dev = wimax_dev_to_dev(wimax_dev);
 108         void *data;
 109         struct sk_buff *report_skb;
 110
 111         d_fnstart(3, dev, "(wimax_dev %p new_state %u old_state %u)\n",
 112                   wimax_dev, new_state, old_state);
 113         result = -ENOMEM;
 114         report_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 115         if (report_skb == NULL) {
 116                 dev_err(dev, "RE_STCH: can't create message\n");
 117                 goto error_new;
 118         }
 119         data = genlmsg_put(report_skb, 0, wimax_gnl_mcg.id, &wimax_gnl_family,
 120                            0, WIMAX_GNL_RE_STATE_CHANGE);
 121         if (data == NULL) {
 122                 dev_err(dev, "RE_STCH: can't put data into message\n");
 123                 goto error_put;
 124         }
 125         *header = data;
 126
 127         result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_OLD, old_state);
 128         if (result < 0) {
 129                 dev_err(dev, "RE_STCH: Error adding OLD attr: %d\n", result);
 130                 goto error_put;
 131         }
 132         result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_NEW, new_state);
 133         if (result < 0) {
 134                 dev_err(dev, "RE_STCH: Error adding NEW attr: %d\n", result);
 135                 goto error_put;
 136         }
 137         result = nla_put_u32(report_skb, WIMAX_GNL_STCH_IFIDX,
 138                              wimax_dev->net_dev->ifindex);
 139         if (result < 0) {
 140                 dev_err(dev, "RE_STCH: Error adding IFINDEX attribute\n");
 141                 goto error_put;
 142         }
 143         d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %p\n",
 144                 wimax_dev, new_state, old_state, report_skb);
 145         return report_skb;
 146
 147 error_put:
 148         nlmsg_free(report_skb);
 149 error_new:
 150         d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %d\n",
 151                 wimax_dev, new_state, old_state, result);
 152         return ERR_PTR(result);
 153 }
 154
 155
 156 /*
 157  * Send a Report State Change message (as created with _alloc).
 158  *
 159  * @report_skb: as returned by wimax_gnl_re_state_change_alloc()
 160  * @header: as returned by wimax_gnl_re_state_change_alloc()
 161  *
 162  * Returns: 0 if ok, < 0 errno code on error.
 163  *
 164  * If the message is  NULL, pretend it didn't happen.
 165  */
 166 static
 167 int wimax_gnl_re_state_change_send(
 168         struct wimax_dev *wimax_dev, struct sk_buff *report_skb,
 169         void *header)
 170 {
 171         int result = 0;
 172         struct device *dev = wimax_dev_to_dev(wimax_dev);
 173         d_fnstart(3, dev, "(wimax_dev %p report_skb %p)\n",
 174                   wimax_dev, report_skb);
 175         if (report_skb == NULL) {
 176                 result = -ENOMEM;
 177                 goto out;
 178         }
 179         genlmsg_end(report_skb, header);
 180         genlmsg_multicast(report_skb, 0, wimax_gnl_mcg.id, GFP_KERNEL);
 181 out:
 182         d_fnend(3, dev, "(wimax_dev %p report_skb %p) = %d\n",
 183                 wimax_dev, report_skb, result);
 184         return result;
 185 }
 186
 187
 188 static
 189 void __check_new_state(enum wimax_st old_state, enum wimax_st new_state,
 190                        unsigned int allowed_states_bm)
 191 {
 192         if (WARN_ON(((1 << new_state) & allowed_states_bm) == 0)) {
 193                 printk(KERN_ERR "SW BUG! Forbidden state change %u -> %u\n",
 194                         old_state, new_state);
 195         }
 196 }
 197
 198
 199 /*
 200  * Set the current state of a WiMAX device [unlocking version of
 201  * wimax_state_change().
 202  */
 203 void __wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
 204 {
 205         struct device *dev = wimax_dev_to_dev(wimax_dev);
 206         enum wimax_st old_state = wimax_dev->state;
 207         struct sk_buff *stch_skb;
 208         void *header;
 209
 210         d_fnstart(3, dev, "(wimax_dev %p new_state %u [old %u])\n",
 211                   wimax_dev, new_state, old_state);
 212
 213         if (WARN_ON(new_state >= __WIMAX_ST_INVALID)) {
 214                 dev_err(dev, "SW BUG: requesting invalid state %u\n",
 215                         new_state);
 216                 goto out;
 217         }
 218         if (old_state == new_state)
 219                 goto out;
 220         header = NULL;  /* gcc complains? can't grok why */
 221         stch_skb = wimax_gnl_re_state_change_alloc(
 222                 wimax_dev, new_state, old_state, &header);
 223
 224         /* Verify the state transition and do exit-from-state actions */
 225         switch (old_state) {
 226         case __WIMAX_ST_NULL:
 227                 __check_new_state(old_state, new_state,
 228                                   1 << WIMAX_ST_DOWN);
 229                 break;
 230         case WIMAX_ST_DOWN:
 231                 __check_new_state(old_state, new_state,
 232                                   1 << __WIMAX_ST_QUIESCING
 233                                   | 1 << WIMAX_ST_UNINITIALIZED
 234                                   | 1 << WIMAX_ST_RADIO_OFF);
 235                 break;
 236         case __WIMAX_ST_QUIESCING:
 237                 __check_new_state(old_state, new_state, 1 << WIMAX_ST_DOWN);
 238                 break;
 239         case WIMAX_ST_UNINITIALIZED:
 240                 __check_new_state(old_state, new_state,
 241                                   1 << __WIMAX_ST_QUIESCING
 242                                   | 1 << WIMAX_ST_RADIO_OFF);
 243                 break;
 244         case WIMAX_ST_RADIO_OFF:
 245                 __check_new_state(old_state, new_state,
 246                                   1 << __WIMAX_ST_QUIESCING
 247                                   | 1 << WIMAX_ST_READY);
 248                 break;
 249         case WIMAX_ST_READY:
 250                 __check_new_state(old_state, new_state,
 251                                   1 << __WIMAX_ST_QUIESCING
 252                                   | 1 << WIMAX_ST_RADIO_OFF
 253                                   | 1 << WIMAX_ST_SCANNING
 254                                   | 1 << WIMAX_ST_CONNECTING
 255                                   | 1 << WIMAX_ST_CONNECTED);
 256                 break;
 257         case WIMAX_ST_SCANNING:
 258                 __check_new_state(old_state, new_state,
 259                                   1 << __WIMAX_ST_QUIESCING
 260                                   | 1 << WIMAX_ST_RADIO_OFF
 261                                   | 1 << WIMAX_ST_READY
 262                                   | 1 << WIMAX_ST_CONNECTING
 263                                   | 1 << WIMAX_ST_CONNECTED);
 264                 break;
 265         case WIMAX_ST_CONNECTING:
 266                 __check_new_state(old_state, new_state,
 267                                   1 << __WIMAX_ST_QUIESCING
 268                                   | 1 << WIMAX_ST_RADIO_OFF
 269                                   | 1 << WIMAX_ST_READY
 270                                   | 1 << WIMAX_ST_SCANNING
 271                                   | 1 << WIMAX_ST_CONNECTED);
 272                 break;
 273         case WIMAX_ST_CONNECTED:
 274                 __check_new_state(old_state, new_state,
 275                                   1 << __WIMAX_ST_QUIESCING
 276                                   | 1 << WIMAX_ST_RADIO_OFF
 277                                   | 1 << WIMAX_ST_READY);
 278                 netif_tx_disable(wimax_dev->net_dev);
 279                 netif_carrier_off(wimax_dev->net_dev);
 280                 break;
 281         case __WIMAX_ST_INVALID:
 282         default:
 283                 dev_err(dev, "SW BUG: wimax_dev %p is in unknown state %u\n",
 284                         wimax_dev, wimax_dev->state);
 285                 WARN_ON(1);
 286                 goto out;
 287         }
 288
 289         /* Execute the actions of entry to the new state */
 290         switch (new_state) {
 291         case __WIMAX_ST_NULL:
 292                 dev_err(dev, "SW BUG: wimax_dev %p entering NULL state "
 293                         "from %u\n", wimax_dev, wimax_dev->state);
 294                 WARN_ON(1);             /* Nobody can enter this state */
 295                 break;
 296         case WIMAX_ST_DOWN:
 297                 break;
 298         case __WIMAX_ST_QUIESCING:
 299                 break;
 300         case WIMAX_ST_UNINITIALIZED:
 301                 break;
 302         case WIMAX_ST_RADIO_OFF:
 303                 break;
 304         case WIMAX_ST_READY:
 305                 break;
 306         case WIMAX_ST_SCANNING:
 307                 break;
 308         case WIMAX_ST_CONNECTING:
 309                 break;
 310         case WIMAX_ST_CONNECTED:
 311                 netif_carrier_on(wimax_dev->net_dev);
 312                 netif_wake_queue(wimax_dev->net_dev);
 313                 break;
 314         case __WIMAX_ST_INVALID:
 315         default:
 316                 BUG();
 317         }
 318         __wimax_state_set(wimax_dev, new_state);
 319         if (!IS_ERR(stch_skb))
 320                 wimax_gnl_re_state_change_send(wimax_dev, stch_skb, header);
 321 out:
 322         d_fnend(3, dev, "(wimax_dev %p new_state %u [old %u]) = void\n",
 323                 wimax_dev, new_state, old_state);
 324 }
 325
 326
 327 /**
 328  * wimax_state_change - Set the current state of a WiMAX device
 329  *
 330  * @wimax_dev: WiMAX device descriptor (properly referenced)
 331  * @new_state: New state to switch to
 332  *
 333  * This implements the state changes for the wimax devices. It will
 334  *
 335  * - verify that the state transition is legal (for now it'll just
 336  *   print a warning if not) according to the table in
 337  *   linux/wimax.h's documentation for 'enum wimax_st'.
 338  *
 339  * - perform the actions needed for leaving the current state and
 340  *   whichever are needed for entering the new state.
 341  *
 342  * - issue a report to user space indicating the new state (and an
 343  *   optional payload with information about the new state).
 344  *
 345  * NOTE: @wimax_dev must be locked
 346  */
 347 void wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
 348 {
 349         /*
 350          * A driver cannot take the wimax_dev out of the
 351          * __WIMAX_ST_NULL state unless by calling wimax_dev_add(). If
 352          * the wimax_dev's state is still NULL, we ignore any request
 353          * to change its state because it means it hasn't been yet
 354          * registered.
 355          *
 356          * There is no need to complain about it, as routines that
 357          * call this might be shared from different code paths that
 358          * are called before or after wimax_dev_add() has done its
 359          * job.
 360          */
 361         mutex_lock(&wimax_dev->mutex);
 362         if (wimax_dev->state > __WIMAX_ST_NULL)
 363                 __wimax_state_change(wimax_dev, new_state);
 364         mutex_unlock(&wimax_dev->mutex);
 365 }
 366 EXPORT_SYMBOL_GPL(wimax_state_change);
 367
 368
 369 /**
 370  * wimax_state_get() - Return the current state of a WiMAX device
 371  *
 372  * @wimax_dev: WiMAX device descriptor
 373  *
 374  * Returns: Current state of the device according to its driver.
 375  */
 376 enum wimax_st wimax_state_get(struct wimax_dev *wimax_dev)
 377 {
 378         enum wimax_st state;
 379         mutex_lock(&wimax_dev->mutex);
 380         state = wimax_dev->state;
 381         mutex_unlock(&wimax_dev->mutex);
 382         return state;
 383 }
 384 EXPORT_SYMBOL_GPL(wimax_state_get);
 385
 386
 387 /**
 388  * wimax_dev_init - initialize a newly allocated instance
 389  *
 390  * @wimax_dev: WiMAX device descriptor to initialize.
 391  *
 392  * Initializes fields of a freshly allocated @wimax_dev instance. This
 393  * function assumes that after allocation, the memory occupied by
 394  * @wimax_dev was zeroed.
 395  */
 396 void wimax_dev_init(struct wimax_dev *wimax_dev)
 397 {
 398         INIT_LIST_HEAD(&wimax_dev->id_table_node);
 399         __wimax_state_set(wimax_dev, __WIMAX_ST_NULL);
 400         mutex_init(&wimax_dev->mutex);
 401         mutex_init(&wimax_dev->mutex_reset);
 402 }
 403 EXPORT_SYMBOL_GPL(wimax_dev_init);
 404
 405 /*
 406  * This extern is declared here because it's easier to keep track --
 407  * both declarations are a list of the same
 408  */
 409 extern struct genl_ops
 410         wimax_gnl_msg_from_user,
 411         wimax_gnl_reset,
 412         wimax_gnl_rfkill,
 413         wimax_gnl_state_get;
 414
 415 static
 416 struct genl_ops *wimax_gnl_ops[] = {
 417         &wimax_gnl_msg_from_user,
 418         &wimax_gnl_reset,
 419         &wimax_gnl_rfkill,
 420         &wimax_gnl_state_get,
 421 };
 422
 423
 424 static
 425 size_t wimax_addr_scnprint(char *addr_str, size_t addr_str_size,
 426                            unsigned char *addr, size_t addr_len)
 427 {
 428         unsigned int cnt, total;
 429
 430         for (total = cnt = 0; cnt < addr_len; cnt++)
 431                 total += scnprintf(addr_str + total, addr_str_size - total,
 432                                    "%02x%c", addr[cnt],
 433                                    cnt == addr_len - 1 ? '\0' : ':');
 434         return total;
 435 }
 436
 437
 438 /**
 439  * wimax_dev_add - Register a new WiMAX device
 440  *
 441  * @wimax_dev: WiMAX device descriptor (as embedded in your @net_dev's
 442  *     priv data). You must have called wimax_dev_init() on it before.
 443  *
 444  * @net_dev: net device the @wimax_dev is associated with. The
 445  *     function expects SET_NETDEV_DEV() and register_netdev() were
 446  *     already called on it.
 447  *
 448  * Registers the new WiMAX device, sets up the user-kernel control
 449  * interface (generic netlink) and common WiMAX infrastructure.
 450  *
 451  * Note that the parts that will allow interaction with user space are
 452  * setup at the very end, when the rest is in place, as once that
 453  * happens, the driver might get user space control requests via
 454  * netlink or from debugfs that might translate into calls into
 455  * wimax_dev->op_*().
 456  */
 457 int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
 458 {
 459         int result;
 460         struct device *dev = net_dev->dev.parent;
 461         char addr_str[32];
 462
 463         d_fnstart(3, dev, "(wimax_dev %p net_dev %p)\n", wimax_dev, net_dev);
 464
 465         /* Do the RFKILL setup before locking, as RFKILL will call
 466          * into our functions. */
 467         wimax_dev->net_dev = net_dev;
 468         result = wimax_rfkill_add(wimax_dev);
 469         if (result < 0)
 470                 goto error_rfkill_add;
 471
 472         /* Set up user-space interaction */
 473         mutex_lock(&wimax_dev->mutex);
 474         wimax_id_table_add(wimax_dev);
 475         result = wimax_debugfs_add(wimax_dev);
 476         if (result < 0) {
 477                 dev_err(dev, "cannot initialize debugfs: %d\n",
 478                         result);
 479                 goto error_debugfs_add;
 480         }
 481
 482         __wimax_state_set(wimax_dev, WIMAX_ST_DOWN);
 483         mutex_unlock(&wimax_dev->mutex);
 484
 485         wimax_addr_scnprint(addr_str, sizeof(addr_str),
 486                             net_dev->dev_addr, net_dev->addr_len);
 487         dev_err(dev, "WiMAX interface %s (%s) ready\n",
 488                 net_dev->name, addr_str);
 489         d_fnend(3, dev, "(wimax_dev %p net_dev %p) = 0\n", wimax_dev, net_dev);
 490         return 0;
 491
 492 error_debugfs_add:
 493         wimax_id_table_rm(wimax_dev);
 494         mutex_unlock(&wimax_dev->mutex);
 495         wimax_rfkill_rm(wimax_dev);
 496 error_rfkill_add:
 497         d_fnend(3, dev, "(wimax_dev %p net_dev %p) = %d\n",
 498                 wimax_dev, net_dev, result);
 499         return result;
 500 }
 501 EXPORT_SYMBOL_GPL(wimax_dev_add);
 502
 503
 504 /**
 505  * wimax_dev_rm - Unregister an existing WiMAX device
 506  *
 507  * @wimax_dev: WiMAX device descriptor
 508  *
 509  * Unregisters a WiMAX device previously registered for use with
 510  * wimax_add_rm().
 511  *
 512  * IMPORTANT! Must call before calling unregister_netdev().
 513  *
 514  * After this function returns, you will not get any more user space
 515  * control requests (via netlink or debugfs) and thus to wimax_dev->ops.
 516  *
 517  * Reentrancy control is ensured by setting the state to
 518  * %__WIMAX_ST_QUIESCING. rfkill operations coming through
 519  * wimax_*rfkill*() will be stopped by the quiescing state; ops coming
 520  * from the rfkill subsystem will be stopped by the support being
 521  * removed by wimax_rfkill_rm().
 522  */
 523 void wimax_dev_rm(struct wimax_dev *wimax_dev)
 524 {
 525         d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev);
 526
 527         mutex_lock(&wimax_dev->mutex);
 528         __wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
 529         wimax_debugfs_rm(wimax_dev);
 530         wimax_id_table_rm(wimax_dev);
 531         __wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
 532         mutex_unlock(&wimax_dev->mutex);
 533         wimax_rfkill_rm(wimax_dev);
 534         d_fnend(3, NULL, "(wimax_dev %p) = void\n", wimax_dev);
 535 }
 536 EXPORT_SYMBOL_GPL(wimax_dev_rm);
 537
 538
 539 /* Debug framework control of debug levels */
 540 struct d_level D_LEVEL[] = {
 541         D_SUBMODULE_DEFINE(debugfs),
 542         D_SUBMODULE_DEFINE(id_table),
 543         D_SUBMODULE_DEFINE(op_msg),
 544         D_SUBMODULE_DEFINE(op_reset),
 545         D_SUBMODULE_DEFINE(op_rfkill),
 546         D_SUBMODULE_DEFINE(op_state_get),
 547         D_SUBMODULE_DEFINE(stack),
 548 };
 549 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
 550
 551
 552 struct genl_family wimax_gnl_family = {
 553         .id = GENL_ID_GENERATE,
 554         .name = "WiMAX",
 555         .version = WIMAX_GNL_VERSION,
 556         .hdrsize = 0,
 557         .maxattr = WIMAX_GNL_ATTR_MAX,
 558 };
 559
 560 struct genl_multicast_group wimax_gnl_mcg = {
 561         .name = "msg",
 562 };
 563
 564
 565
 566 /* Shutdown the wimax stack */
 567 static
 568 int __init wimax_subsys_init(void)
 569 {
 570         int result, cnt;
 571
 572         d_fnstart(4, NULL, "()\n");
 573         d_parse_params(D_LEVEL, D_LEVEL_SIZE, wimax_debug_params,
 574                        "wimax.debug");
 575
 576         snprintf(wimax_gnl_family.name, sizeof(wimax_gnl_family.name),
 577                  "WiMAX");
 578         result = genl_register_family(&wimax_gnl_family);
 579         if (unlikely(result < 0)) {
 580                 printk(KERN_ERR "cannot register generic netlink family: %d\n",
 581                        result);
 582                 goto error_register_family;
 583         }
 584
 585         for (cnt = 0; cnt < ARRAY_SIZE(wimax_gnl_ops); cnt++) {
 586                 result = genl_register_ops(&wimax_gnl_family,
 587                                            wimax_gnl_ops[cnt]);
 588                 d_printf(4, NULL, "registering generic netlink op code "
 589                          "%u: %d\n", wimax_gnl_ops[cnt]->cmd, result);
 590                 if (unlikely(result < 0)) {
 591                         printk(KERN_ERR "cannot register generic netlink op "
 592                                "code %u: %d\n",
 593                                wimax_gnl_ops[cnt]->cmd, result);
 594                         goto error_register_ops;
 595                 }
 596         }
 597
 598         result = genl_register_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
 599         if (result < 0)
 600                 goto error_mc_group;
 601         d_fnend(4, NULL, "() = 0\n");
 602         return 0;
 603
 604 error_mc_group:
 605 error_register_ops:
 606         for (cnt--; cnt >= 0; cnt--)
 607                 genl_unregister_ops(&wimax_gnl_family,
 608                                     wimax_gnl_ops[cnt]);
 609         genl_unregister_family(&wimax_gnl_family);
 610 error_register_family:
 611         d_fnend(4, NULL, "() = %d\n", result);
 612         return result;
 613
 614 }
 615 module_init(wimax_subsys_init);
 616
 617
 618 /* Shutdown the wimax stack */
 619 static
 620 void __exit wimax_subsys_exit(void)
 621 {
 622         int cnt;
 623         wimax_id_table_release();
 624         genl_unregister_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
 625         for (cnt = ARRAY_SIZE(wimax_gnl_ops) - 1; cnt >= 0; cnt--)
 626                 genl_unregister_ops(&wimax_gnl_family,
 627                                     wimax_gnl_ops[cnt]);
 628         genl_unregister_family(&wimax_gnl_family);
 629 }
 630 module_exit(wimax_subsys_exit);
 631
 632 MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
 633 MODULE_DESCRIPTION("Linux WiMAX stack");
 634 MODULE_LICENSE("GPL");
 635