stack.c 17.8 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633
/*
 * Linux WiMAX
 * Initialization, addition and removal of wimax devices
 *
 *
 * Copyright (C) 2005-2006 Intel Corporation <linux-wimax@intel.com>
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 *
 * This implements:
 *
 *   - basic life cycle of 'struct wimax_dev' [wimax_dev_*()]; on
 *     addition/registration initialize all subfields and allocate
 *     generic netlink resources for user space communication. On
 *     removal/unregistration, undo all that.
 *
 *   - device state machine [wimax_state_change()] and support to send
 *     reports to user space when the state changes
 *     [wimax_gnl_re_state_change*()].
 *
 * See include/net/wimax.h for rationales and design.
 *
 * ROADMAP
 *
 * [__]wimax_state_change()     Called by drivers to update device's state
 *   wimax_gnl_re_state_change_alloc()
 *   wimax_gnl_re_state_change_send()
 *
 * wimax_dev_init()	        Init a device
 * wimax_dev_add()              Register
 *   wimax_rfkill_add()
 *   wimax_gnl_add()            Register all the generic netlink resources.
 *   wimax_id_table_add()
 * wimax_dev_rm()               Unregister
 *   wimax_id_table_rm()
 *   wimax_gnl_rm()
 *   wimax_rfkill_rm()
 */
#include <linux/device.h>
#include <linux/gfp.h>
#include <net/genetlink.h>
#include <linux/netdevice.h>
#include <linux/wimax.h>
#include "wimax-internal.h"


#define D_SUBMODULE stack
#include "debug-levels.h"

static char wimax_debug_params[128];
module_param_string(debug, wimax_debug_params, sizeof(wimax_debug_params),
		    0644);
MODULE_PARM_DESC(debug,
		 "String of space-separated NAME:VALUE pairs, where NAMEs "
		 "are the different debug submodules and VALUE are the "
		 "initial debug value to set.");

/*
 * Authoritative source for the RE_STATE_CHANGE attribute policy
 *
 * We don't really use it here, but /me likes to keep the definition
 * close to where the data is generated.
 */
/*
static const struct nla_policy wimax_gnl_re_status_change[WIMAX_GNL_ATTR_MAX + 1] = {
	[WIMAX_GNL_STCH_STATE_OLD] = { .type = NLA_U8 },
	[WIMAX_GNL_STCH_STATE_NEW] = { .type = NLA_U8 },
};
*/


/*
 * Allocate a Report State Change message
 *
 * @header: save it, you need it for _send()
 *
 * Creates and fills a basic state change message; different code
 * paths can then add more attributes to the message as needed.
 *
 * Use wimax_gnl_re_state_change_send() to send the returned skb.
 *
 * Returns: skb with the genl message if ok, IS_ERR() ptr on error
 *     with an errno code.
 */
static
struct sk_buff *wimax_gnl_re_state_change_alloc(
	struct wimax_dev *wimax_dev,
	enum wimax_st new_state, enum wimax_st old_state,
	void **header)
{
	int result;
	struct device *dev = wimax_dev_to_dev(wimax_dev);
	void *data;
	struct sk_buff *report_skb;

	d_fnstart(3, dev, "(wimax_dev %p new_state %u old_state %u)\n",
		  wimax_dev, new_state, old_state);
	result = -ENOMEM;
	report_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (report_skb == NULL) {
		dev_err(dev, "RE_STCH: can't create message\n");
		goto error_new;
	}
	data = genlmsg_put(report_skb, 0, wimax_gnl_mcg.id, &wimax_gnl_family,
			   0, WIMAX_GNL_RE_STATE_CHANGE);
	if (data == NULL) {
		dev_err(dev, "RE_STCH: can't put data into message\n");
		goto error_put;
	}
	*header = data;

	result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_OLD, old_state);
	if (result < 0) {
		dev_err(dev, "RE_STCH: Error adding OLD attr: %d\n", result);
		goto error_put;
	}
	result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_NEW, new_state);
	if (result < 0) {
		dev_err(dev, "RE_STCH: Error adding NEW attr: %d\n", result);
		goto error_put;
	}
	result = nla_put_u32(report_skb, WIMAX_GNL_STCH_IFIDX,
			     wimax_dev->net_dev->ifindex);
	if (result < 0) {
		dev_err(dev, "RE_STCH: Error adding IFINDEX attribute\n");
		goto error_put;
	}
	d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %p\n",
		wimax_dev, new_state, old_state, report_skb);
	return report_skb;

error_put:
	nlmsg_free(report_skb);
error_new:
	d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %d\n",
		wimax_dev, new_state, old_state, result);
	return ERR_PTR(result);
}


/*
 * Send a Report State Change message (as created with _alloc).
 *
 * @report_skb: as returned by wimax_gnl_re_state_change_alloc()
 * @header: as returned by wimax_gnl_re_state_change_alloc()
 *
 * Returns: 0 if ok, < 0 errno code on error.
 *
 * If the message is  NULL, pretend it didn't happen.
 */
static
int wimax_gnl_re_state_change_send(
	struct wimax_dev *wimax_dev, struct sk_buff *report_skb,
	void *header)
{
	int result = 0;
	struct device *dev = wimax_dev_to_dev(wimax_dev);
	d_fnstart(3, dev, "(wimax_dev %p report_skb %p)\n",
		  wimax_dev, report_skb);
	if (report_skb == NULL) {
		result = -ENOMEM;
		goto out;
	}
	genlmsg_end(report_skb, header);
	genlmsg_multicast(report_skb, 0, wimax_gnl_mcg.id, GFP_KERNEL);
out:
	d_fnend(3, dev, "(wimax_dev %p report_skb %p) = %d\n",
		wimax_dev, report_skb, result);
	return result;
}


static
void __check_new_state(enum wimax_st old_state, enum wimax_st new_state,
		       unsigned allowed_states_bm)
{
	if (WARN_ON(((1 << new_state) & allowed_states_bm) == 0)) {
		printk(KERN_ERR "SW BUG! Forbidden state change %u -> %u\n",
			old_state, new_state);
	}
}


/*
 * Set the current state of a WiMAX device [unlocking version of
 * wimax_state_change().
 */
void __wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
{
	struct device *dev = wimax_dev_to_dev(wimax_dev);
	enum wimax_st old_state = wimax_dev->state;
	struct sk_buff *stch_skb;
	void *header;

	d_fnstart(3, dev, "(wimax_dev %p new_state %u [old %u])\n",
		  wimax_dev, new_state, old_state);

	if (WARN_ON(new_state >= __WIMAX_ST_INVALID)) {
		dev_err(dev, "SW BUG: requesting invalid state %u\n",
			new_state);
		goto out;
	}
	if (old_state == new_state)
		goto out;
	header = NULL;	/* gcc complains? can't grok why */
	stch_skb = wimax_gnl_re_state_change_alloc(
		wimax_dev, new_state, old_state, &header);

	/* Verify the state transition and do exit-from-state actions */
	switch (old_state) {
	case __WIMAX_ST_NULL:
		__check_new_state(old_state, new_state,
				  1 << WIMAX_ST_DOWN);
		break;
	case WIMAX_ST_DOWN:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_UNINITIALIZED
				  | 1 << WIMAX_ST_RADIO_OFF);
		break;
	case __WIMAX_ST_QUIESCING:
		__check_new_state(old_state, new_state, 1 << WIMAX_ST_DOWN);
		break;
	case WIMAX_ST_UNINITIALIZED:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_RADIO_OFF);
		break;
	case WIMAX_ST_RADIO_OFF:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_READY);
		break;
	case WIMAX_ST_READY:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_RADIO_OFF
				  | 1 << WIMAX_ST_SCANNING
				  | 1 << WIMAX_ST_CONNECTING
				  | 1 << WIMAX_ST_CONNECTED);
		break;
	case WIMAX_ST_SCANNING:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_RADIO_OFF
				  | 1 << WIMAX_ST_READY
				  | 1 << WIMAX_ST_CONNECTING
				  | 1 << WIMAX_ST_CONNECTED);
		break;
	case WIMAX_ST_CONNECTING:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_RADIO_OFF
				  | 1 << WIMAX_ST_READY
				  | 1 << WIMAX_ST_SCANNING
				  | 1 << WIMAX_ST_CONNECTED);
		break;
	case WIMAX_ST_CONNECTED:
		__check_new_state(old_state, new_state,
				  1 << __WIMAX_ST_QUIESCING
				  | 1 << WIMAX_ST_RADIO_OFF
				  | 1 << WIMAX_ST_READY);
		netif_tx_disable(wimax_dev->net_dev);
		netif_carrier_off(wimax_dev->net_dev);
		break;
	case __WIMAX_ST_INVALID:
	default:
		dev_err(dev, "SW BUG: wimax_dev %p is in unknown state %u\n",
			wimax_dev, wimax_dev->state);
		WARN_ON(1);
		goto out;
	}

	/* Execute the actions of entry to the new state */
	switch (new_state) {
	case __WIMAX_ST_NULL:
		dev_err(dev, "SW BUG: wimax_dev %p entering NULL state "
			"from %u\n", wimax_dev, wimax_dev->state);
		WARN_ON(1);		/* Nobody can enter this state */
		break;
	case WIMAX_ST_DOWN:
		break;
	case __WIMAX_ST_QUIESCING:
		break;
	case WIMAX_ST_UNINITIALIZED:
		break;
	case WIMAX_ST_RADIO_OFF:
		break;
	case WIMAX_ST_READY:
		break;
	case WIMAX_ST_SCANNING:
		break;
	case WIMAX_ST_CONNECTING:
		break;
	case WIMAX_ST_CONNECTED:
		netif_carrier_on(wimax_dev->net_dev);
		netif_wake_queue(wimax_dev->net_dev);
		break;
	case __WIMAX_ST_INVALID:
	default:
		BUG();
	}
	__wimax_state_set(wimax_dev, new_state);
	if (!IS_ERR(stch_skb))
		wimax_gnl_re_state_change_send(wimax_dev, stch_skb, header);
out:
	d_fnend(3, dev, "(wimax_dev %p new_state %u [old %u]) = void\n",
		wimax_dev, new_state, old_state);
}


/**
 * wimax_state_change - Set the current state of a WiMAX device
 *
 * @wimax_dev: WiMAX device descriptor (properly referenced)
 * @new_state: New state to switch to
 *
 * This implements the state changes for the wimax devices. It will
 *
 * - verify that the state transition is legal (for now it'll just
 *   print a warning if not) according to the table in
 *   linux/wimax.h's documentation for 'enum wimax_st'.
 *
 * - perform the actions needed for leaving the current state and
 *   whichever are needed for entering the new state.
 *
 * - issue a report to user space indicating the new state (and an
 *   optional payload with information about the new state).
 *
 * NOTE: @wimax_dev must be locked
 */
void wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
{
	/*
	 * A driver cannot take the wimax_dev out of the
	 * __WIMAX_ST_NULL state unless by calling wimax_dev_add(). If
	 * the wimax_dev's state is still NULL, we ignore any request
	 * to change its state because it means it hasn't been yet
	 * registered.
	 *
	 * There is no need to complain about it, as routines that
	 * call this might be shared from different code paths that
	 * are called before or after wimax_dev_add() has done its
	 * job.
	 */
	mutex_lock(&wimax_dev->mutex);
	if (wimax_dev->state > __WIMAX_ST_NULL)
		__wimax_state_change(wimax_dev, new_state);
	mutex_unlock(&wimax_dev->mutex);
}
EXPORT_SYMBOL_GPL(wimax_state_change);


/**
 * wimax_state_get() - Return the current state of a WiMAX device
 *
 * @wimax_dev: WiMAX device descriptor
 *
 * Returns: Current state of the device according to its driver.
 */
enum wimax_st wimax_state_get(struct wimax_dev *wimax_dev)
{
	enum wimax_st state;
	mutex_lock(&wimax_dev->mutex);
	state = wimax_dev->state;
	mutex_unlock(&wimax_dev->mutex);
	return state;
}
EXPORT_SYMBOL_GPL(wimax_state_get);


/**
 * wimax_dev_init - initialize a newly allocated instance
 *
 * @wimax_dev: WiMAX device descriptor to initialize.
 *
 * Initializes fields of a freshly allocated @wimax_dev instance. This
 * function assumes that after allocation, the memory occupied by
 * @wimax_dev was zeroed.
 */
void wimax_dev_init(struct wimax_dev *wimax_dev)
{
	INIT_LIST_HEAD(&wimax_dev->id_table_node);
	__wimax_state_set(wimax_dev, __WIMAX_ST_NULL);
	mutex_init(&wimax_dev->mutex);
	mutex_init(&wimax_dev->mutex_reset);
}
EXPORT_SYMBOL_GPL(wimax_dev_init);

/*
 * This extern is declared here because it's easier to keep track --
 * both declarations are a list of the same
 */
extern struct genl_ops
	wimax_gnl_msg_from_user,
	wimax_gnl_reset,
	wimax_gnl_rfkill,
	wimax_gnl_state_get;

static
struct genl_ops *wimax_gnl_ops[] = {
	&wimax_gnl_msg_from_user,
	&wimax_gnl_reset,
	&wimax_gnl_rfkill,
	&wimax_gnl_state_get,
};


static
size_t wimax_addr_scnprint(char *addr_str, size_t addr_str_size,
			   unsigned char *addr, size_t addr_len)
{
	unsigned cnt, total;
	for (total = cnt = 0; cnt < addr_len; cnt++)
		total += scnprintf(addr_str + total, addr_str_size - total,
				   "%02x%c", addr[cnt],
				   cnt == addr_len - 1 ? '\0' : ':');
	return total;
}


/**
 * wimax_dev_add - Register a new WiMAX device
 *
 * @wimax_dev: WiMAX device descriptor (as embedded in your @net_dev's
 *     priv data). You must have called wimax_dev_init() on it before.
 *
 * @net_dev: net device the @wimax_dev is associated with. The
 *     function expects SET_NETDEV_DEV() and register_netdev() were
 *     already called on it.
 *
 * Registers the new WiMAX device, sets up the user-kernel control
 * interface (generic netlink) and common WiMAX infrastructure.
 *
 * Note that the parts that will allow interaction with user space are
 * setup at the very end, when the rest is in place, as once that
 * happens, the driver might get user space control requests via
 * netlink or from debugfs that might translate into calls into
 * wimax_dev->op_*().
 */
int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
{
	int result;
	struct device *dev = net_dev->dev.parent;
	char addr_str[32];

	d_fnstart(3, dev, "(wimax_dev %p net_dev %p)\n", wimax_dev, net_dev);

	/* Do the RFKILL setup before locking, as RFKILL will call
	 * into our functions. */
	wimax_dev->net_dev = net_dev;
	result = wimax_rfkill_add(wimax_dev);
	if (result < 0)
		goto error_rfkill_add;

	/* Set up user-space interaction */
	mutex_lock(&wimax_dev->mutex);
	wimax_id_table_add(wimax_dev);
	result = wimax_debugfs_add(wimax_dev);
	if (result < 0) {
		dev_err(dev, "cannot initialize debugfs: %d\n",
			result);
		goto error_debugfs_add;
	}

	__wimax_state_set(wimax_dev, WIMAX_ST_DOWN);
	mutex_unlock(&wimax_dev->mutex);

	wimax_addr_scnprint(addr_str, sizeof(addr_str),
			    net_dev->dev_addr, net_dev->addr_len);
	dev_err(dev, "WiMAX interface %s (%s) ready\n",
		net_dev->name, addr_str);
	d_fnend(3, dev, "(wimax_dev %p net_dev %p) = 0\n", wimax_dev, net_dev);
	return 0;

error_debugfs_add:
	wimax_id_table_rm(wimax_dev);
	mutex_unlock(&wimax_dev->mutex);
	wimax_rfkill_rm(wimax_dev);
error_rfkill_add:
	d_fnend(3, dev, "(wimax_dev %p net_dev %p) = %d\n",
		wimax_dev, net_dev, result);
	return result;
}
EXPORT_SYMBOL_GPL(wimax_dev_add);


/**
 * wimax_dev_rm - Unregister an existing WiMAX device
 *
 * @wimax_dev: WiMAX device descriptor
 *
 * Unregisters a WiMAX device previously registered for use with
 * wimax_add_rm().
 *
 * IMPORTANT! Must call before calling unregister_netdev().
 *
 * After this function returns, you will not get any more user space
 * control requests (via netlink or debugfs) and thus to wimax_dev->ops.
 *
 * Reentrancy control is ensured by setting the state to
 * %__WIMAX_ST_QUIESCING. rfkill operations coming through
 * wimax_*rfkill*() will be stopped by the quiescing state; ops coming
 * from the rfkill subsystem will be stopped by the support being
 * removed by wimax_rfkill_rm().
 */
void wimax_dev_rm(struct wimax_dev *wimax_dev)
{
	d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev);

	mutex_lock(&wimax_dev->mutex);
	__wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
	wimax_debugfs_rm(wimax_dev);
	wimax_id_table_rm(wimax_dev);
	__wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
	mutex_unlock(&wimax_dev->mutex);
	wimax_rfkill_rm(wimax_dev);
	d_fnend(3, NULL, "(wimax_dev %p) = void\n", wimax_dev);
}
EXPORT_SYMBOL_GPL(wimax_dev_rm);


/* Debug framework control of debug levels */
struct d_level D_LEVEL[] = {
	D_SUBMODULE_DEFINE(debugfs),
	D_SUBMODULE_DEFINE(id_table),
	D_SUBMODULE_DEFINE(op_msg),
	D_SUBMODULE_DEFINE(op_reset),
	D_SUBMODULE_DEFINE(op_rfkill),
	D_SUBMODULE_DEFINE(op_state_get),
	D_SUBMODULE_DEFINE(stack),
};
size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);


struct genl_family wimax_gnl_family = {
	.id = GENL_ID_GENERATE,
	.name = "WiMAX",
	.version = WIMAX_GNL_VERSION,
	.hdrsize = 0,
	.maxattr = WIMAX_GNL_ATTR_MAX,
};

struct genl_multicast_group wimax_gnl_mcg = {
	.name = "msg",
};



/* Shutdown the wimax stack */
static
int __init wimax_subsys_init(void)
{
	int result, cnt;

	d_fnstart(4, NULL, "()\n");
	d_parse_params(D_LEVEL, D_LEVEL_SIZE, wimax_debug_params,
		       "wimax.debug");

	snprintf(wimax_gnl_family.name, sizeof(wimax_gnl_family.name),
		 "WiMAX");
	result = genl_register_family(&wimax_gnl_family);
	if (unlikely(result < 0)) {
		printk(KERN_ERR "cannot register generic netlink family: %d\n",
		       result);
		goto error_register_family;
	}

	for (cnt = 0; cnt < ARRAY_SIZE(wimax_gnl_ops); cnt++) {
		result = genl_register_ops(&wimax_gnl_family,
					   wimax_gnl_ops[cnt]);
		d_printf(4, NULL, "registering generic netlink op code "
			 "%u: %d\n", wimax_gnl_ops[cnt]->cmd, result);
		if (unlikely(result < 0)) {
			printk(KERN_ERR "cannot register generic netlink op "
			       "code %u: %d\n",
			       wimax_gnl_ops[cnt]->cmd, result);
			goto error_register_ops;
		}
	}

	result = genl_register_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
	if (result < 0)
		goto error_mc_group;
	d_fnend(4, NULL, "() = 0\n");
	return 0;

error_mc_group:
error_register_ops:
	for (cnt--; cnt >= 0; cnt--)
		genl_unregister_ops(&wimax_gnl_family,
				    wimax_gnl_ops[cnt]);
	genl_unregister_family(&wimax_gnl_family);
error_register_family:
	d_fnend(4, NULL, "() = %d\n", result);
	return result;

}
module_init(wimax_subsys_init);


/* Shutdown the wimax stack */
static
void __exit wimax_subsys_exit(void)
{
	int cnt;
	wimax_id_table_release();
	genl_unregister_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
	for (cnt = ARRAY_SIZE(wimax_gnl_ops) - 1; cnt >= 0; cnt--)
		genl_unregister_ops(&wimax_gnl_family,
				    wimax_gnl_ops[cnt]);
	genl_unregister_family(&wimax_gnl_family);
}
module_exit(wimax_subsys_exit);

MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
MODULE_DESCRIPTION("Linux WiMAX stack");
MODULE_LICENSE("GPL");