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
wimax_gnl_re_state_change_alloc(struct wimax_dev * wimax_dev,enum wimax_st new_state,enum wimax_st old_state,void ** header)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 /* FIXME: sending a group ID as the seq is wrong */
120 data = genlmsg_put(report_skb, 0, wimax_gnl_family.mcgrp_offset,
121 &wimax_gnl_family, 0, WIMAX_GNL_RE_STATE_CHANGE);
122 if (data == NULL) {
123 dev_err(dev, "RE_STCH: can't put data into message\n");
124 goto error_put;
125 }
126 *header = data;
127
128 result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_OLD, old_state);
129 if (result < 0) {
130 dev_err(dev, "RE_STCH: Error adding OLD attr: %d\n", result);
131 goto error_put;
132 }
133 result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_NEW, new_state);
134 if (result < 0) {
135 dev_err(dev, "RE_STCH: Error adding NEW attr: %d\n", result);
136 goto error_put;
137 }
138 result = nla_put_u32(report_skb, WIMAX_GNL_STCH_IFIDX,
139 wimax_dev->net_dev->ifindex);
140 if (result < 0) {
141 dev_err(dev, "RE_STCH: Error adding IFINDEX attribute\n");
142 goto error_put;
143 }
144 d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %p\n",
145 wimax_dev, new_state, old_state, report_skb);
146 return report_skb;
147
148 error_put:
149 nlmsg_free(report_skb);
150 error_new:
151 d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %d\n",
152 wimax_dev, new_state, old_state, result);
153 return ERR_PTR(result);
154 }
155
156
157 /*
158 * Send a Report State Change message (as created with _alloc).
159 *
160 * @report_skb: as returned by wimax_gnl_re_state_change_alloc()
161 * @header: as returned by wimax_gnl_re_state_change_alloc()
162 *
163 * Returns: 0 if ok, < 0 errno code on error.
164 *
165 * If the message is NULL, pretend it didn't happen.
166 */
167 static
wimax_gnl_re_state_change_send(struct wimax_dev * wimax_dev,struct sk_buff * report_skb,void * header)168 int wimax_gnl_re_state_change_send(
169 struct wimax_dev *wimax_dev, struct sk_buff *report_skb,
170 void *header)
171 {
172 int result = 0;
173 struct device *dev = wimax_dev_to_dev(wimax_dev);
174 d_fnstart(3, dev, "(wimax_dev %p report_skb %p)\n",
175 wimax_dev, report_skb);
176 if (report_skb == NULL) {
177 result = -ENOMEM;
178 goto out;
179 }
180 genlmsg_end(report_skb, header);
181 genlmsg_multicast(&wimax_gnl_family, report_skb, 0, 0, GFP_KERNEL);
182 out:
183 d_fnend(3, dev, "(wimax_dev %p report_skb %p) = %d\n",
184 wimax_dev, report_skb, result);
185 return result;
186 }
187
188
189 static
__check_new_state(enum wimax_st old_state,enum wimax_st new_state,unsigned int allowed_states_bm)190 void __check_new_state(enum wimax_st old_state, enum wimax_st new_state,
191 unsigned int allowed_states_bm)
192 {
193 if (WARN_ON(((1 << new_state) & allowed_states_bm) == 0)) {
194 pr_err("SW BUG! Forbidden state change %u -> %u\n",
195 old_state, new_state);
196 }
197 }
198
199
200 /*
201 * Set the current state of a WiMAX device [unlocking version of
202 * wimax_state_change().
203 */
__wimax_state_change(struct wimax_dev * wimax_dev,enum wimax_st new_state)204 void __wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
205 {
206 struct device *dev = wimax_dev_to_dev(wimax_dev);
207 enum wimax_st old_state = wimax_dev->state;
208 struct sk_buff *stch_skb;
209 void *header;
210
211 d_fnstart(3, dev, "(wimax_dev %p new_state %u [old %u])\n",
212 wimax_dev, new_state, old_state);
213
214 if (WARN_ON(new_state >= __WIMAX_ST_INVALID)) {
215 dev_err(dev, "SW BUG: requesting invalid state %u\n",
216 new_state);
217 goto out;
218 }
219 if (old_state == new_state)
220 goto out;
221 header = NULL; /* gcc complains? can't grok why */
222 stch_skb = wimax_gnl_re_state_change_alloc(
223 wimax_dev, new_state, old_state, &header);
224
225 /* Verify the state transition and do exit-from-state actions */
226 switch (old_state) {
227 case __WIMAX_ST_NULL:
228 __check_new_state(old_state, new_state,
229 1 << WIMAX_ST_DOWN);
230 break;
231 case WIMAX_ST_DOWN:
232 __check_new_state(old_state, new_state,
233 1 << __WIMAX_ST_QUIESCING
234 | 1 << WIMAX_ST_UNINITIALIZED
235 | 1 << WIMAX_ST_RADIO_OFF);
236 break;
237 case __WIMAX_ST_QUIESCING:
238 __check_new_state(old_state, new_state, 1 << WIMAX_ST_DOWN);
239 break;
240 case WIMAX_ST_UNINITIALIZED:
241 __check_new_state(old_state, new_state,
242 1 << __WIMAX_ST_QUIESCING
243 | 1 << WIMAX_ST_RADIO_OFF);
244 break;
245 case WIMAX_ST_RADIO_OFF:
246 __check_new_state(old_state, new_state,
247 1 << __WIMAX_ST_QUIESCING
248 | 1 << WIMAX_ST_READY);
249 break;
250 case WIMAX_ST_READY:
251 __check_new_state(old_state, new_state,
252 1 << __WIMAX_ST_QUIESCING
253 | 1 << WIMAX_ST_RADIO_OFF
254 | 1 << WIMAX_ST_SCANNING
255 | 1 << WIMAX_ST_CONNECTING
256 | 1 << WIMAX_ST_CONNECTED);
257 break;
258 case WIMAX_ST_SCANNING:
259 __check_new_state(old_state, new_state,
260 1 << __WIMAX_ST_QUIESCING
261 | 1 << WIMAX_ST_RADIO_OFF
262 | 1 << WIMAX_ST_READY
263 | 1 << WIMAX_ST_CONNECTING
264 | 1 << WIMAX_ST_CONNECTED);
265 break;
266 case WIMAX_ST_CONNECTING:
267 __check_new_state(old_state, new_state,
268 1 << __WIMAX_ST_QUIESCING
269 | 1 << WIMAX_ST_RADIO_OFF
270 | 1 << WIMAX_ST_READY
271 | 1 << WIMAX_ST_SCANNING
272 | 1 << WIMAX_ST_CONNECTED);
273 break;
274 case WIMAX_ST_CONNECTED:
275 __check_new_state(old_state, new_state,
276 1 << __WIMAX_ST_QUIESCING
277 | 1 << WIMAX_ST_RADIO_OFF
278 | 1 << WIMAX_ST_READY);
279 netif_tx_disable(wimax_dev->net_dev);
280 netif_carrier_off(wimax_dev->net_dev);
281 break;
282 case __WIMAX_ST_INVALID:
283 default:
284 dev_err(dev, "SW BUG: wimax_dev %p is in unknown state %u\n",
285 wimax_dev, wimax_dev->state);
286 WARN_ON(1);
287 goto out;
288 }
289
290 /* Execute the actions of entry to the new state */
291 switch (new_state) {
292 case __WIMAX_ST_NULL:
293 dev_err(dev, "SW BUG: wimax_dev %p entering NULL state "
294 "from %u\n", wimax_dev, wimax_dev->state);
295 WARN_ON(1); /* Nobody can enter this state */
296 break;
297 case WIMAX_ST_DOWN:
298 break;
299 case __WIMAX_ST_QUIESCING:
300 break;
301 case WIMAX_ST_UNINITIALIZED:
302 break;
303 case WIMAX_ST_RADIO_OFF:
304 break;
305 case WIMAX_ST_READY:
306 break;
307 case WIMAX_ST_SCANNING:
308 break;
309 case WIMAX_ST_CONNECTING:
310 break;
311 case WIMAX_ST_CONNECTED:
312 netif_carrier_on(wimax_dev->net_dev);
313 netif_wake_queue(wimax_dev->net_dev);
314 break;
315 case __WIMAX_ST_INVALID:
316 default:
317 BUG();
318 }
319 __wimax_state_set(wimax_dev, new_state);
320 if (!IS_ERR(stch_skb))
321 wimax_gnl_re_state_change_send(wimax_dev, stch_skb, header);
322 out:
323 d_fnend(3, dev, "(wimax_dev %p new_state %u [old %u]) = void\n",
324 wimax_dev, new_state, old_state);
325 }
326
327
328 /**
329 * wimax_state_change - Set the current state of a WiMAX device
330 *
331 * @wimax_dev: WiMAX device descriptor (properly referenced)
332 * @new_state: New state to switch to
333 *
334 * This implements the state changes for the wimax devices. It will
335 *
336 * - verify that the state transition is legal (for now it'll just
337 * print a warning if not) according to the table in
338 * linux/wimax.h's documentation for 'enum wimax_st'.
339 *
340 * - perform the actions needed for leaving the current state and
341 * whichever are needed for entering the new state.
342 *
343 * - issue a report to user space indicating the new state (and an
344 * optional payload with information about the new state).
345 *
346 * NOTE: @wimax_dev must be locked
347 */
wimax_state_change(struct wimax_dev * wimax_dev,enum wimax_st new_state)348 void wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
349 {
350 /*
351 * A driver cannot take the wimax_dev out of the
352 * __WIMAX_ST_NULL state unless by calling wimax_dev_add(). If
353 * the wimax_dev's state is still NULL, we ignore any request
354 * to change its state because it means it hasn't been yet
355 * registered.
356 *
357 * There is no need to complain about it, as routines that
358 * call this might be shared from different code paths that
359 * are called before or after wimax_dev_add() has done its
360 * job.
361 */
362 mutex_lock(&wimax_dev->mutex);
363 if (wimax_dev->state > __WIMAX_ST_NULL)
364 __wimax_state_change(wimax_dev, new_state);
365 mutex_unlock(&wimax_dev->mutex);
366 }
367 EXPORT_SYMBOL_GPL(wimax_state_change);
368
369
370 /**
371 * wimax_state_get() - Return the current state of a WiMAX device
372 *
373 * @wimax_dev: WiMAX device descriptor
374 *
375 * Returns: Current state of the device according to its driver.
376 */
wimax_state_get(struct wimax_dev * wimax_dev)377 enum wimax_st wimax_state_get(struct wimax_dev *wimax_dev)
378 {
379 enum wimax_st state;
380 mutex_lock(&wimax_dev->mutex);
381 state = wimax_dev->state;
382 mutex_unlock(&wimax_dev->mutex);
383 return state;
384 }
385 EXPORT_SYMBOL_GPL(wimax_state_get);
386
387
388 /**
389 * wimax_dev_init - initialize a newly allocated instance
390 *
391 * @wimax_dev: WiMAX device descriptor to initialize.
392 *
393 * Initializes fields of a freshly allocated @wimax_dev instance. This
394 * function assumes that after allocation, the memory occupied by
395 * @wimax_dev was zeroed.
396 */
wimax_dev_init(struct wimax_dev * wimax_dev)397 void wimax_dev_init(struct wimax_dev *wimax_dev)
398 {
399 INIT_LIST_HEAD(&wimax_dev->id_table_node);
400 __wimax_state_set(wimax_dev, __WIMAX_ST_NULL);
401 mutex_init(&wimax_dev->mutex);
402 mutex_init(&wimax_dev->mutex_reset);
403 }
404 EXPORT_SYMBOL_GPL(wimax_dev_init);
405
406 static const struct nla_policy wimax_gnl_policy[WIMAX_GNL_ATTR_MAX + 1] = {
407 [WIMAX_GNL_RESET_IFIDX] = { .type = NLA_U32, },
408 [WIMAX_GNL_RFKILL_IFIDX] = { .type = NLA_U32, },
409 [WIMAX_GNL_RFKILL_STATE] = {
410 .type = NLA_U32 /* enum wimax_rf_state */
411 },
412 [WIMAX_GNL_STGET_IFIDX] = { .type = NLA_U32, },
413 [WIMAX_GNL_MSG_IFIDX] = { .type = NLA_U32, },
414 [WIMAX_GNL_MSG_DATA] = {
415 .type = NLA_UNSPEC, /* libnl doesn't grok BINARY yet */
416 },
417 };
418
419 static const struct genl_ops wimax_gnl_ops[] = {
420 {
421 .cmd = WIMAX_GNL_OP_MSG_FROM_USER,
422 .flags = GENL_ADMIN_PERM,
423 .policy = wimax_gnl_policy,
424 .doit = wimax_gnl_doit_msg_from_user,
425 },
426 {
427 .cmd = WIMAX_GNL_OP_RESET,
428 .flags = GENL_ADMIN_PERM,
429 .policy = wimax_gnl_policy,
430 .doit = wimax_gnl_doit_reset,
431 },
432 {
433 .cmd = WIMAX_GNL_OP_RFKILL,
434 .flags = GENL_ADMIN_PERM,
435 .policy = wimax_gnl_policy,
436 .doit = wimax_gnl_doit_rfkill,
437 },
438 {
439 .cmd = WIMAX_GNL_OP_STATE_GET,
440 .flags = GENL_ADMIN_PERM,
441 .policy = wimax_gnl_policy,
442 .doit = wimax_gnl_doit_state_get,
443 },
444 };
445
446
447 static
wimax_addr_scnprint(char * addr_str,size_t addr_str_size,unsigned char * addr,size_t addr_len)448 size_t wimax_addr_scnprint(char *addr_str, size_t addr_str_size,
449 unsigned char *addr, size_t addr_len)
450 {
451 unsigned int cnt, total;
452
453 for (total = cnt = 0; cnt < addr_len; cnt++)
454 total += scnprintf(addr_str + total, addr_str_size - total,
455 "%02x%c", addr[cnt],
456 cnt == addr_len - 1 ? '\0' : ':');
457 return total;
458 }
459
460
461 /**
462 * wimax_dev_add - Register a new WiMAX device
463 *
464 * @wimax_dev: WiMAX device descriptor (as embedded in your @net_dev's
465 * priv data). You must have called wimax_dev_init() on it before.
466 *
467 * @net_dev: net device the @wimax_dev is associated with. The
468 * function expects SET_NETDEV_DEV() and register_netdev() were
469 * already called on it.
470 *
471 * Registers the new WiMAX device, sets up the user-kernel control
472 * interface (generic netlink) and common WiMAX infrastructure.
473 *
474 * Note that the parts that will allow interaction with user space are
475 * setup at the very end, when the rest is in place, as once that
476 * happens, the driver might get user space control requests via
477 * netlink or from debugfs that might translate into calls into
478 * wimax_dev->op_*().
479 */
wimax_dev_add(struct wimax_dev * wimax_dev,struct net_device * net_dev)480 int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
481 {
482 int result;
483 struct device *dev = net_dev->dev.parent;
484 char addr_str[32];
485
486 d_fnstart(3, dev, "(wimax_dev %p net_dev %p)\n", wimax_dev, net_dev);
487
488 /* Do the RFKILL setup before locking, as RFKILL will call
489 * into our functions.
490 */
491 wimax_dev->net_dev = net_dev;
492 result = wimax_rfkill_add(wimax_dev);
493 if (result < 0)
494 goto error_rfkill_add;
495
496 /* Set up user-space interaction */
497 mutex_lock(&wimax_dev->mutex);
498 wimax_id_table_add(wimax_dev);
499 result = wimax_debugfs_add(wimax_dev);
500 if (result < 0) {
501 dev_err(dev, "cannot initialize debugfs: %d\n",
502 result);
503 goto error_debugfs_add;
504 }
505
506 __wimax_state_set(wimax_dev, WIMAX_ST_DOWN);
507 mutex_unlock(&wimax_dev->mutex);
508
509 wimax_addr_scnprint(addr_str, sizeof(addr_str),
510 net_dev->dev_addr, net_dev->addr_len);
511 dev_err(dev, "WiMAX interface %s (%s) ready\n",
512 net_dev->name, addr_str);
513 d_fnend(3, dev, "(wimax_dev %p net_dev %p) = 0\n", wimax_dev, net_dev);
514 return 0;
515
516 error_debugfs_add:
517 wimax_id_table_rm(wimax_dev);
518 mutex_unlock(&wimax_dev->mutex);
519 wimax_rfkill_rm(wimax_dev);
520 error_rfkill_add:
521 d_fnend(3, dev, "(wimax_dev %p net_dev %p) = %d\n",
522 wimax_dev, net_dev, result);
523 return result;
524 }
525 EXPORT_SYMBOL_GPL(wimax_dev_add);
526
527
528 /**
529 * wimax_dev_rm - Unregister an existing WiMAX device
530 *
531 * @wimax_dev: WiMAX device descriptor
532 *
533 * Unregisters a WiMAX device previously registered for use with
534 * wimax_add_rm().
535 *
536 * IMPORTANT! Must call before calling unregister_netdev().
537 *
538 * After this function returns, you will not get any more user space
539 * control requests (via netlink or debugfs) and thus to wimax_dev->ops.
540 *
541 * Reentrancy control is ensured by setting the state to
542 * %__WIMAX_ST_QUIESCING. rfkill operations coming through
543 * wimax_*rfkill*() will be stopped by the quiescing state; ops coming
544 * from the rfkill subsystem will be stopped by the support being
545 * removed by wimax_rfkill_rm().
546 */
wimax_dev_rm(struct wimax_dev * wimax_dev)547 void wimax_dev_rm(struct wimax_dev *wimax_dev)
548 {
549 d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev);
550
551 mutex_lock(&wimax_dev->mutex);
552 __wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
553 wimax_debugfs_rm(wimax_dev);
554 wimax_id_table_rm(wimax_dev);
555 __wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
556 mutex_unlock(&wimax_dev->mutex);
557 wimax_rfkill_rm(wimax_dev);
558 d_fnend(3, NULL, "(wimax_dev %p) = void\n", wimax_dev);
559 }
560 EXPORT_SYMBOL_GPL(wimax_dev_rm);
561
562
563 /* Debug framework control of debug levels */
564 struct d_level D_LEVEL[] = {
565 D_SUBMODULE_DEFINE(debugfs),
566 D_SUBMODULE_DEFINE(id_table),
567 D_SUBMODULE_DEFINE(op_msg),
568 D_SUBMODULE_DEFINE(op_reset),
569 D_SUBMODULE_DEFINE(op_rfkill),
570 D_SUBMODULE_DEFINE(op_state_get),
571 D_SUBMODULE_DEFINE(stack),
572 };
573 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
574
575
576 static const struct genl_multicast_group wimax_gnl_mcgrps[] = {
577 { .name = "msg", },
578 };
579
580 struct genl_family wimax_gnl_family __ro_after_init = {
581 .name = "WiMAX",
582 .version = WIMAX_GNL_VERSION,
583 .hdrsize = 0,
584 .maxattr = WIMAX_GNL_ATTR_MAX,
585 .module = THIS_MODULE,
586 .ops = wimax_gnl_ops,
587 .n_ops = ARRAY_SIZE(wimax_gnl_ops),
588 .mcgrps = wimax_gnl_mcgrps,
589 .n_mcgrps = ARRAY_SIZE(wimax_gnl_mcgrps),
590 };
591
592
593
594 /* Shutdown the wimax stack */
595 static
wimax_subsys_init(void)596 int __init wimax_subsys_init(void)
597 {
598 int result;
599
600 d_fnstart(4, NULL, "()\n");
601 d_parse_params(D_LEVEL, D_LEVEL_SIZE, wimax_debug_params,
602 "wimax.debug");
603
604 result = genl_register_family(&wimax_gnl_family);
605 if (unlikely(result < 0)) {
606 pr_err("cannot register generic netlink family: %d\n", result);
607 goto error_register_family;
608 }
609
610 d_fnend(4, NULL, "() = 0\n");
611 return 0;
612
613 error_register_family:
614 d_fnend(4, NULL, "() = %d\n", result);
615 return result;
616
617 }
618 module_init(wimax_subsys_init);
619
620
621 /* Shutdown the wimax stack */
622 static
wimax_subsys_exit(void)623 void __exit wimax_subsys_exit(void)
624 {
625 wimax_id_table_release();
626 genl_unregister_family(&wimax_gnl_family);
627 }
628 module_exit(wimax_subsys_exit);
629
630 MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
631 MODULE_DESCRIPTION("Linux WiMAX stack");
632 MODULE_LICENSE("GPL");
633
