[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / wireless / core.c

/*
 * This is the linux wireless configuration interface.
 *
 * Copyright 2006-2008		Johannes Berg <johannes@sipsolutions.net>
 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/list.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include <net/wireless.h>
#include "nl80211.h"
#include "core.h"
#include "sysfs.h"
#include "reg.h"

/* name for sysfs, %d is appended */
#define PHY_NAME "phy"

MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");

/* RCU might be appropriate here since we usually
 * only read the list, and that can happen quite
 * often because we need to do it for each command */
LIST_HEAD(cfg80211_drv_list);
DEFINE_MUTEX(cfg80211_drv_mutex);
static int wiphy_counter;

/* for debugfs */
static struct dentry *ieee80211_debugfs_dir;

/* requires cfg80211_drv_mutex to be held! */
static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
{
	struct cfg80211_registered_device *result = NULL, *drv;

	list_for_each_entry(drv, &cfg80211_drv_list, list) {
		if (drv->idx == wiphy) {
			result = drv;
			break;
		}
	}

	return result;
}

/* requires cfg80211_drv_mutex to be held! */
static struct cfg80211_registered_device *
__cfg80211_drv_from_info(struct genl_info *info)
{
	int ifindex;
	struct cfg80211_registered_device *bywiphy = NULL, *byifidx = NULL;
	struct net_device *dev;
	int err = -EINVAL;

	if (info->attrs[NL80211_ATTR_WIPHY]) {
		bywiphy = cfg80211_drv_by_wiphy(
				nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
		err = -ENODEV;
	}

	if (info->attrs[NL80211_ATTR_IFINDEX]) {
		ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
		dev = dev_get_by_index(&init_net, ifindex);
		if (dev) {
			if (dev->ieee80211_ptr)
				byifidx =
					wiphy_to_dev(dev->ieee80211_ptr->wiphy);
			dev_put(dev);
		}
		err = -ENODEV;
	}

	if (bywiphy && byifidx) {
		if (bywiphy != byifidx)
			return ERR_PTR(-EINVAL);
		else
			return bywiphy; /* == byifidx */
	}
	if (bywiphy)
		return bywiphy;

	if (byifidx)
		return byifidx;

	return ERR_PTR(err);
}

struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info)
{
	struct cfg80211_registered_device *drv;

	mutex_lock(&cfg80211_drv_mutex);
	drv = __cfg80211_drv_from_info(info);

	/* if it is not an error we grab the lock on
	 * it to assure it won't be going away while
	 * we operate on it */
	if (!IS_ERR(drv))
		mutex_lock(&drv->mtx);

	mutex_unlock(&cfg80211_drv_mutex);

	return drv;
}

struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(int ifindex)
{
	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
	struct net_device *dev;

	mutex_lock(&cfg80211_drv_mutex);
	dev = dev_get_by_index(&init_net, ifindex);
	if (!dev)
		goto out;
	if (dev->ieee80211_ptr) {
		drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
		mutex_lock(&drv->mtx);
	} else
		drv = ERR_PTR(-ENODEV);
	dev_put(dev);
 out:
	mutex_unlock(&cfg80211_drv_mutex);
	return drv;
}

void cfg80211_put_dev(struct cfg80211_registered_device *drv)
{
	BUG_ON(IS_ERR(drv));
	mutex_unlock(&drv->mtx);
}

int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
			char *newname)
{
	struct cfg80211_registered_device *drv;
	int idx, taken = -1, result, digits;

	mutex_lock(&cfg80211_drv_mutex);

	/* prohibit calling the thing phy%d when %d is not its number */
	sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
	if (taken == strlen(newname) && idx != rdev->idx) {
		/* count number of places needed to print idx */
		digits = 1;
		while (idx /= 10)
			digits++;
		/*
		 * deny the name if it is phy<idx> where <idx> is printed
		 * without leading zeroes. taken == strlen(newname) here
		 */
		result = -EINVAL;
		if (taken == strlen(PHY_NAME) + digits)
			goto out_unlock;
	}


	/* Ignore nop renames */
	result = 0;
	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
		goto out_unlock;

	/* Ensure another device does not already have this name. */
	list_for_each_entry(drv, &cfg80211_drv_list, list) {
		result = -EINVAL;
		if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
			goto out_unlock;
	}

	/* this will only check for collisions in sysfs
	 * which is not even always compiled in.
	 */
	result = device_rename(&rdev->wiphy.dev, newname);
	if (result)
		goto out_unlock;

	if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
			    rdev->wiphy.debugfsdir,
			    rdev->wiphy.debugfsdir->d_parent,
			    newname))
		printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
		       newname);

	result = 0;
out_unlock:
	mutex_unlock(&cfg80211_drv_mutex);
	if (result == 0)
		nl80211_notify_dev_rename(rdev);

	return result;
}

/* exported functions */

struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
{
	struct cfg80211_registered_device *drv;
	int alloc_size;

	WARN_ON(!ops->add_key && ops->del_key);
	WARN_ON(ops->add_key && !ops->del_key);

	alloc_size = sizeof(*drv) + sizeof_priv;

	drv = kzalloc(alloc_size, GFP_KERNEL);
	if (!drv)
		return NULL;

	drv->ops = ops;

	mutex_lock(&cfg80211_drv_mutex);

	drv->idx = wiphy_counter;

	/* now increase counter for the next device unless
	 * it has wrapped previously */
	if (wiphy_counter >= 0)
		wiphy_counter++;

	mutex_unlock(&cfg80211_drv_mutex);

	if (unlikely(drv->idx < 0)) {
		/* ugh, wrapped! */
		kfree(drv);
		return NULL;
	}

	/* give it a proper name */
	snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
		 PHY_NAME "%d", drv->idx);

	mutex_init(&drv->mtx);
	mutex_init(&drv->devlist_mtx);
	INIT_LIST_HEAD(&drv->netdev_list);

	device_initialize(&drv->wiphy.dev);
	drv->wiphy.dev.class = &ieee80211_class;
	drv->wiphy.dev.platform_data = drv;

	return &drv->wiphy;
}
EXPORT_SYMBOL(wiphy_new);

int wiphy_register(struct wiphy *wiphy)
{
	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	int res;
	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	bool have_band = false;
	int i;
	u16 ifmodes = wiphy->interface_modes;

	/* sanity check ifmodes */
	WARN_ON(!ifmodes);
	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	if (WARN_ON(ifmodes != wiphy->interface_modes))
		wiphy->interface_modes = ifmodes;

	/* sanity check supported bands/channels */
	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		sband = wiphy->bands[band];
		if (!sband)
			continue;

		sband->band = band;

		if (!sband->n_channels || !sband->n_bitrates) {
			WARN_ON(1);
			return -EINVAL;
		}

		for (i = 0; i < sband->n_channels; i++) {
			sband->channels[i].orig_flags =
				sband->channels[i].flags;
			sband->channels[i].orig_mag =
				sband->channels[i].max_antenna_gain;
			sband->channels[i].orig_mpwr =
				sband->channels[i].max_power;
			sband->channels[i].band = band;
		}

		have_band = true;
	}

	if (!have_band) {
		WARN_ON(1);
		return -EINVAL;
	}

	/* check and set up bitrates */
	ieee80211_set_bitrate_flags(wiphy);

	/* set up regulatory info */
	mutex_lock(&cfg80211_reg_mutex);
	wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
	mutex_unlock(&cfg80211_reg_mutex);

	mutex_lock(&cfg80211_drv_mutex);

	res = device_add(&drv->wiphy.dev);
	if (res)
		goto out_unlock;

	list_add(&drv->list, &cfg80211_drv_list);

	/* add to debugfs */
	drv->wiphy.debugfsdir =
		debugfs_create_dir(wiphy_name(&drv->wiphy),
				   ieee80211_debugfs_dir);

	res = 0;
out_unlock:
	mutex_unlock(&cfg80211_drv_mutex);
	return res;
}
EXPORT_SYMBOL(wiphy_register);

void wiphy_unregister(struct wiphy *wiphy)
{
	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);

	/* protect the device list */
	mutex_lock(&cfg80211_drv_mutex);

	BUG_ON(!list_empty(&drv->netdev_list));

	/*
	 * Try to grab drv->mtx. If a command is still in progress,
	 * hopefully the driver will refuse it since it's tearing
	 * down the device already. We wait for this command to complete
	 * before unlinking the item from the list.
	 * Note: as codified by the BUG_ON above we cannot get here if
	 * a virtual interface is still associated. Hence, we can only
	 * get to lock contention here if userspace issues a command
	 * that identified the hardware by wiphy index.
	 */
	mutex_lock(&drv->mtx);
	/* unlock again before freeing */
	mutex_unlock(&drv->mtx);

	list_del(&drv->list);
	device_del(&drv->wiphy.dev);
	debugfs_remove(drv->wiphy.debugfsdir);

	mutex_unlock(&cfg80211_drv_mutex);
}
EXPORT_SYMBOL(wiphy_unregister);

void cfg80211_dev_free(struct cfg80211_registered_device *drv)
{
	mutex_destroy(&drv->mtx);
	mutex_destroy(&drv->devlist_mtx);
	kfree(drv);
}

void wiphy_free(struct wiphy *wiphy)
{
	put_device(&wiphy->dev);
}
EXPORT_SYMBOL(wiphy_free);

static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
					 unsigned long state,
					 void *ndev)
{
	struct net_device *dev = ndev;
	struct cfg80211_registered_device *rdev;

	if (!dev->ieee80211_ptr)
		return 0;

	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);

	switch (state) {
	case NETDEV_REGISTER:
		mutex_lock(&rdev->devlist_mtx);
		list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
		if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
				      "phy80211")) {
			printk(KERN_ERR "wireless: failed to add phy80211 "
				"symlink to netdev!\n");
		}
		dev->ieee80211_ptr->netdev = dev;
		mutex_unlock(&rdev->devlist_mtx);
		break;
	case NETDEV_UNREGISTER:
		mutex_lock(&rdev->devlist_mtx);
		if (!list_empty(&dev->ieee80211_ptr->list)) {
			sysfs_remove_link(&dev->dev.kobj, "phy80211");
			list_del_init(&dev->ieee80211_ptr->list);
		}
		mutex_unlock(&rdev->devlist_mtx);
		break;
	}

	return 0;
}

static struct notifier_block cfg80211_netdev_notifier = {
	.notifier_call = cfg80211_netdev_notifier_call,
};

static int cfg80211_init(void)
{
	int err;

	err = wiphy_sysfs_init();
	if (err)
		goto out_fail_sysfs;

	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	if (err)
		goto out_fail_notifier;

	err = nl80211_init();
	if (err)
		goto out_fail_nl80211;

	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);

	err = regulatory_init();
	if (err)
		goto out_fail_reg;

	return 0;

out_fail_reg:
	debugfs_remove(ieee80211_debugfs_dir);
out_fail_nl80211:
	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
out_fail_notifier:
	wiphy_sysfs_exit();
out_fail_sysfs:
	return err;
}

subsys_initcall(cfg80211_init);

static void cfg80211_exit(void)
{
	debugfs_remove(ieee80211_debugfs_dir);
	nl80211_exit();
	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
	wiphy_sysfs_exit();
	regulatory_exit();
}
module_exit(cfg80211_exit);
Commit	Line	Data
704232c2 JB	1	/*
	2	* This is the linux wireless configuration interface.
	3	*
f59ac048	4	* Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
704232c2 JB	5	*/
	6
	7	#include <linux/if.h>
	8	#include <linux/module.h>
	9	#include <linux/err.h>
	10	#include <linux/mutex.h>
	11	#include <linux/list.h>
	12	#include <linux/nl80211.h>
	13	#include <linux/debugfs.h>
	14	#include <linux/notifier.h>
	15	#include <linux/device.h>
b2e1b302	16	#include <linux/list.h>
704232c2 JB	17	#include <net/genetlink.h>
	18	#include <net/cfg80211.h>
	19	#include <net/wireless.h>
55682965	20	#include "nl80211.h"
704232c2 JB	21	#include "core.h"
704232c2 JB	22	#include "sysfs.h"
b2e1b302	23	#include "reg.h"
704232c2 JB	24
	25	/* name for sysfs, %d is appended */
	26	#define PHY_NAME "phy"
	27
	28	MODULE_AUTHOR("Johannes Berg");
	29	MODULE_LICENSE("GPL");
	30	MODULE_DESCRIPTION("wireless configuration support");
	31
	32	/* RCU might be appropriate here since we usually
	33	* only read the list, and that can happen quite
	34	* often because we need to do it for each command */
	35	LIST_HEAD(cfg80211_drv_list);
	36	DEFINE_MUTEX(cfg80211_drv_mutex);
	37	static int wiphy_counter;
	38
	39	/* for debugfs */
	40	static struct dentry *ieee80211_debugfs_dir;
	41
55682965 JB	42	/* requires cfg80211_drv_mutex to be held! */
	43	static struct cfg80211_registered_device *cfg80211_drv_by_wiphy(int wiphy)
	44	{
	45	struct cfg80211_registered_device result = NULL, drv;
	46
	47	list_for_each_entry(drv, &cfg80211_drv_list, list) {
	48	if (drv->idx == wiphy) {
	49	result = drv;
	50	break;
	51	}
	52	}
	53
	54	return result;
	55	}
	56
	57	/* requires cfg80211_drv_mutex to be held! */
	58	static struct cfg80211_registered_device *
	59	__cfg80211_drv_from_info(struct genl_info *info)
	60	{
	61	int ifindex;
	62	struct cfg80211_registered_device bywiphy = NULL, byifidx = NULL;
	63	struct net_device *dev;
	64	int err = -EINVAL;
	65
	66	if (info->attrs[NL80211_ATTR_WIPHY]) {
	67	bywiphy = cfg80211_drv_by_wiphy(
	68	nla_get_u32(info->attrs[NL80211_ATTR_WIPHY]));
	69	err = -ENODEV;
	70	}
	71
	72	if (info->attrs[NL80211_ATTR_IFINDEX]) {
	73	ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
	74	dev = dev_get_by_index(&init_net, ifindex);
	75	if (dev) {
	76	if (dev->ieee80211_ptr)
	77	byifidx =
	78	wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	79	dev_put(dev);
	80	}
	81	err = -ENODEV;
	82	}
	83
	84	if (bywiphy && byifidx) {
	85	if (bywiphy != byifidx)
	86	return ERR_PTR(-EINVAL);
	87	else
	88	return bywiphy; /* == byifidx */
	89	}
	90	if (bywiphy)
	91	return bywiphy;
	92
	93	if (byifidx)
	94	return byifidx;
	95
	96	return ERR_PTR(err);
	97	}
	98
	99	struct cfg80211_registered_device *
	100	cfg80211_get_dev_from_info(struct genl_info *info)
	101	{
	102	struct cfg80211_registered_device *drv;
	103
	104	mutex_lock(&cfg80211_drv_mutex);
	105	drv = __cfg80211_drv_from_info(info);
106
107	/* if it is not an error we grab the lock on
108	* it to assure it won't be going away while
109	* we operate on it */
110	if (!IS_ERR(drv))
111	mutex_lock(&drv->mtx);
112
113	mutex_unlock(&cfg80211_drv_mutex);
114
115	return drv;
116	}
117
118	struct cfg80211_registered_device *
119	cfg80211_get_dev_from_ifindex(int ifindex)
120	{
121	struct cfg80211_registered_device *drv = ERR_PTR(-ENODEV);
122	struct net_device *dev;
123
124	mutex_lock(&cfg80211_drv_mutex);
125	dev = dev_get_by_index(&init_net, ifindex);
126	if (!dev)
127	goto out;
128	if (dev->ieee80211_ptr) {
129	drv = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
130	mutex_lock(&drv->mtx);
131	} else
132	drv = ERR_PTR(-ENODEV);
133	dev_put(dev);
134	out:
135	mutex_unlock(&cfg80211_drv_mutex);
136	return drv;
137	}
138
139	void cfg80211_put_dev(struct cfg80211_registered_device *drv)
140	{
141	BUG_ON(IS_ERR(drv));
142	mutex_unlock(&drv->mtx);
143	}
144
145	int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
146	char *newname)
147	{
2940bb69	148	struct cfg80211_registered_device *drv;
55682965 JB	149	int idx, taken = -1, result, digits;
55682965 JB	150
2940bb69 EB	151	mutex_lock(&cfg80211_drv_mutex);
2940bb69 EB	152
55682965 JB	153	/* prohibit calling the thing phy%d when %d is not its number */
	154	sscanf(newname, PHY_NAME "%d%n", &idx, &taken);
	155	if (taken == strlen(newname) && idx != rdev->idx) {
	156	/* count number of places needed to print idx */
	157	digits = 1;
	158	while (idx /= 10)
	159	digits++;
	160	/*
	161	* deny the name if it is phy<idx> where <idx> is printed
	162	* without leading zeroes. taken == strlen(newname) here
	163	*/
2940bb69	164	result = -EINVAL;
55682965	165	if (taken == strlen(PHY_NAME) + digits)
2940bb69 EB	166	goto out_unlock;
	167	}
	168
	169
	170	/* Ignore nop renames */
	171	result = 0;
	172	if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
	173	goto out_unlock;
	174
	175	/* Ensure another device does not already have this name. */
	176	list_for_each_entry(drv, &cfg80211_drv_list, list) {
	177	result = -EINVAL;
	178	if (strcmp(newname, dev_name(&drv->wiphy.dev)) == 0)
	179	goto out_unlock;
55682965 JB	180	}
55682965 JB	181
2940bb69 EB	182	/* this will only check for collisions in sysfs
	183	* which is not even always compiled in.
	184	*/
55682965 JB	185	result = device_rename(&rdev->wiphy.dev, newname);
55682965 JB	186	if (result)
2940bb69	187	goto out_unlock;
55682965 JB	188
	189	if (!debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
	190	rdev->wiphy.debugfsdir,
	191	rdev->wiphy.debugfsdir->d_parent,
	192	newname))
	193	printk(KERN_ERR "cfg80211: failed to rename debugfs dir to %s!\n",
	194	newname);
	195
2940bb69 EB	196	result = 0;
	197	out_unlock:
	198	mutex_unlock(&cfg80211_drv_mutex);
	199	if (result == 0)
	200	nl80211_notify_dev_rename(rdev);
55682965	201
2940bb69	202	return result;
55682965 JB	203	}
55682965 JB	204
704232c2 JB	205	/* exported functions */
	206
	207	struct wiphy wiphy_new(struct cfg80211_ops ops, int sizeof_priv)
	208	{
	209	struct cfg80211_registered_device *drv;
	210	int alloc_size;
	211
41ade00f JB	212	WARN_ON(!ops->add_key && ops->del_key);
	213	WARN_ON(ops->add_key && !ops->del_key);
	214
704232c2 JB	215	alloc_size = sizeof(*drv) + sizeof_priv;
	216
	217	drv = kzalloc(alloc_size, GFP_KERNEL);
	218	if (!drv)
	219	return NULL;
	220
	221	drv->ops = ops;
	222
	223	mutex_lock(&cfg80211_drv_mutex);
	224
a4d73ee1 JB	225	drv->idx = wiphy_counter;
	226
	227	/* now increase counter for the next device unless
	228	* it has wrapped previously */
	229	if (wiphy_counter >= 0)
	230	wiphy_counter++;
	231
	232	mutex_unlock(&cfg80211_drv_mutex);
	233
	234	if (unlikely(drv->idx < 0)) {
704232c2 JB	235	/* ugh, wrapped! */
	236	kfree(drv);
	237	return NULL;
	238	}
704232c2 JB	239
	240	/* give it a proper name */
	241	snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
	242	PHY_NAME "%d", drv->idx);
	243
704232c2 JB	244	mutex_init(&drv->mtx);
	245	mutex_init(&drv->devlist_mtx);
	246	INIT_LIST_HEAD(&drv->netdev_list);
	247
	248	device_initialize(&drv->wiphy.dev);
	249	drv->wiphy.dev.class = &ieee80211_class;
	250	drv->wiphy.dev.platform_data = drv;
	251
	252	return &drv->wiphy;
	253	}
	254	EXPORT_SYMBOL(wiphy_new);
	255
	256	int wiphy_register(struct wiphy *wiphy)
	257	{
	258	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	259	int res;
8318d78a JB	260	enum ieee80211_band band;
	261	struct ieee80211_supported_band *sband;
	262	bool have_band = false;
	263	int i;
f59ac048 LR	264	u16 ifmodes = wiphy->interface_modes;
	265
	266	/* sanity check ifmodes */
	267	WARN_ON(!ifmodes);
	268	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
	269	if (WARN_ON(ifmodes != wiphy->interface_modes))
	270	wiphy->interface_modes = ifmodes;
8318d78a JB	271
	272	/* sanity check supported bands/channels */
	273	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
	274	sband = wiphy->bands[band];
	275	if (!sband)
	276	continue;
	277
	278	sband->band = band;
	279
	280	if (!sband->n_channels \|\| !sband->n_bitrates) {
	281	WARN_ON(1);
	282	return -EINVAL;
	283	}
	284
	285	for (i = 0; i < sband->n_channels; i++) {
	286	sband->channels[i].orig_flags =
	287	sband->channels[i].flags;
	288	sband->channels[i].orig_mag =
	289	sband->channels[i].max_antenna_gain;
	290	sband->channels[i].orig_mpwr =
	291	sband->channels[i].max_power;
	292	sband->channels[i].band = band;
	293	}
	294
	295	have_band = true;
	296	}
	297
	298	if (!have_band) {
	299	WARN_ON(1);
	300	return -EINVAL;
	301	}
	302
	303	/* check and set up bitrates */
	304	ieee80211_set_bitrate_flags(wiphy);
	305
	306	/* set up regulatory info */
b2e1b302 LR	307	mutex_lock(&cfg80211_reg_mutex);
	308	wiphy_update_regulatory(wiphy, REGDOM_SET_BY_CORE);
	309	mutex_unlock(&cfg80211_reg_mutex);
704232c2 JB	310
	311	mutex_lock(&cfg80211_drv_mutex);
	312
704232c2 JB	313	res = device_add(&drv->wiphy.dev);
	314	if (res)
	315	goto out_unlock;
	316
	317	list_add(&drv->list, &cfg80211_drv_list);
	318
	319	/* add to debugfs */
	320	drv->wiphy.debugfsdir =
	321	debugfs_create_dir(wiphy_name(&drv->wiphy),
	322	ieee80211_debugfs_dir);
	323
	324	res = 0;
	325	out_unlock:
	326	mutex_unlock(&cfg80211_drv_mutex);
	327	return res;
	328	}
	329	EXPORT_SYMBOL(wiphy_register);
	330
	331	void wiphy_unregister(struct wiphy *wiphy)
	332	{
	333	struct cfg80211_registered_device *drv = wiphy_to_dev(wiphy);
	334
f16bfc1c	335	/* protect the device list */
704232c2 JB	336	mutex_lock(&cfg80211_drv_mutex);
704232c2 JB	337
f16bfc1c JB	338	BUG_ON(!list_empty(&drv->netdev_list));
	339
	340	/*
	341	* Try to grab drv->mtx. If a command is still in progress,
	342	* hopefully the driver will refuse it since it's tearing
	343	* down the device already. We wait for this command to complete
	344	* before unlinking the item from the list.
	345	* Note: as codified by the BUG_ON above we cannot get here if
	346	* a virtual interface is still associated. Hence, we can only
	347	* get to lock contention here if userspace issues a command
	348	* that identified the hardware by wiphy index.
	349	*/
704232c2	350	mutex_lock(&drv->mtx);
f16bfc1c	351	/* unlock again before freeing */
704232c2 JB	352	mutex_unlock(&drv->mtx);
704232c2 JB	353
f16bfc1c	354	list_del(&drv->list);
704232c2 JB	355	device_del(&drv->wiphy.dev);
	356	debugfs_remove(drv->wiphy.debugfsdir);
	357
	358	mutex_unlock(&cfg80211_drv_mutex);
	359	}
	360	EXPORT_SYMBOL(wiphy_unregister);
	361
	362	void cfg80211_dev_free(struct cfg80211_registered_device *drv)
	363	{
	364	mutex_destroy(&drv->mtx);
	365	mutex_destroy(&drv->devlist_mtx);
	366	kfree(drv);
	367	}
	368
	369	void wiphy_free(struct wiphy *wiphy)
	370	{
	371	put_device(&wiphy->dev);
	372	}
	373	EXPORT_SYMBOL(wiphy_free);
	374
	375	static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
	376	unsigned long state,
	377	void *ndev)
	378	{
	379	struct net_device *dev = ndev;
	380	struct cfg80211_registered_device *rdev;
	381
	382	if (!dev->ieee80211_ptr)
	383	return 0;
	384
	385	rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
	386
	387	switch (state) {
	388	case NETDEV_REGISTER:
	389	mutex_lock(&rdev->devlist_mtx);
	390	list_add(&dev->ieee80211_ptr->list, &rdev->netdev_list);
	391	if (sysfs_create_link(&dev->dev.kobj, &rdev->wiphy.dev.kobj,
	392	"phy80211")) {
	393	printk(KERN_ERR "wireless: failed to add phy80211 "
	394	"symlink to netdev!\n");
	395	}
	396	dev->ieee80211_ptr->netdev = dev;
	397	mutex_unlock(&rdev->devlist_mtx);
	398	break;
	399	case NETDEV_UNREGISTER:
	400	mutex_lock(&rdev->devlist_mtx);
	401	if (!list_empty(&dev->ieee80211_ptr->list)) {
	402	sysfs_remove_link(&dev->dev.kobj, "phy80211");
	403	list_del_init(&dev->ieee80211_ptr->list);
	404	}
	405	mutex_unlock(&rdev->devlist_mtx);
	406	break;
	407	}
	408
	409	return 0;
	410	}
	411
	412	static struct notifier_block cfg80211_netdev_notifier = {
	413	.notifier_call = cfg80211_netdev_notifier_call,
	414	};
	415
	416	static int cfg80211_init(void)
	417	{
b2e1b302 LR	418	int err;
b2e1b302 LR	419
b2e1b302	420	err = wiphy_sysfs_init();
704232c2 JB	421	if (err)
	422	goto out_fail_sysfs;
	423
	424	err = register_netdevice_notifier(&cfg80211_netdev_notifier);
	425	if (err)
	426	goto out_fail_notifier;
	427
55682965 JB	428	err = nl80211_init();
	429	if (err)
	430	goto out_fail_nl80211;
	431
704232c2 JB	432	ieee80211_debugfs_dir = debugfs_create_dir("ieee80211", NULL);
704232c2 JB	433
b2e1b302 LR	434	err = regulatory_init();
	435	if (err)
	436	goto out_fail_reg;
	437
704232c2 JB	438	return 0;
704232c2 JB	439
b2e1b302 LR	440	out_fail_reg:
b2e1b302 LR	441	debugfs_remove(ieee80211_debugfs_dir);
55682965 JB	442	out_fail_nl80211:
55682965 JB	443	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	444	out_fail_notifier:
	445	wiphy_sysfs_exit();
	446	out_fail_sysfs:
	447	return err;
	448	}
b2e1b302	449
3a462465	450	subsys_initcall(cfg80211_init);
704232c2 JB	451
	452	static void cfg80211_exit(void)
	453	{
	454	debugfs_remove(ieee80211_debugfs_dir);
55682965	455	nl80211_exit();
704232c2 JB	456	unregister_netdevice_notifier(&cfg80211_netdev_notifier);
704232c2 JB	457	wiphy_sysfs_exit();
b2e1b302	458	regulatory_exit();
704232c2 JB	459	}
704232c2 JB	460	module_exit(cfg80211_exit);