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alistair23-linux/net/mac80211/rate.c
Dan Streetman b51d23e4e9 module: add per-module param_lock 
Add a "param_lock" mutex to each module, and update params.c to use
the correct built-in or module mutex while locking kernel params.
Remove the kparam_block_sysfs_r/w() macros, replace them with direct
calls to kernel_param_[un]lock(module).

The kernel param code currently uses a single mutex to protect
modification of any and all kernel params.  While this generally works,
there is one specific problem with it; a module callback function
cannot safely load another module, i.e. with request_module() or even
with indirect calls such as crypto_has_alg().  If the module to be
loaded has any of its params configured (e.g. with a /etc/modprobe.d/*
config file), then the attempt will result in a deadlock between the
first module param callback waiting for modprobe, and modprobe trying to
lock the single kernel param mutex to set the new module's param.

This fixes that by using per-module mutexes, so that each individual module
is protected against concurrent changes in its own kernel params, but is
not blocked by changes to other module params.  All built-in modules
continue to use the built-in mutex, since they will always be loaded at
runtime and references (e.g. request_module(), crypto_has_alg()) to them
will never cause load-time param changing.

This also simplifies the interface used by modules to block sysfs access
to their params; while there are currently functions to block and unblock
sysfs param access which are split up by read and write and expect a single
kernel param to be passed, their actual operation is identical and applies
to all params, not just the one passed to them; they simply lock and unlock
the global param mutex.  They are replaced with direct calls to
kernel_param_[un]lock(THIS_MODULE), which locks THIS_MODULE's param_lock, or
if the module is built-in, it locks the built-in mutex.

Suggested-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2015-06-23 15:27:38 +09:30

765 lines
19 KiB
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/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "rate.h"
#include "ieee80211_i.h"
#include "debugfs.h"
struct rate_control_alg {
struct list_head list;
const struct rate_control_ops *ops;
};
static LIST_HEAD(rate_ctrl_algs);
static DEFINE_MUTEX(rate_ctrl_mutex);
static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
module_param(ieee80211_default_rc_algo, charp, 0644);
MODULE_PARM_DESC(ieee80211_default_rc_algo,
"Default rate control algorithm for mac80211 to use");
int ieee80211_rate_control_register(const struct rate_control_ops *ops)
{
struct rate_control_alg *alg;
if (!ops->name)
return -EINVAL;
mutex_lock(&rate_ctrl_mutex);
list_for_each_entry(alg, &rate_ctrl_algs, list) {
if (!strcmp(alg->ops->name, ops->name)) {
/* don't register an algorithm twice */
WARN_ON(1);
mutex_unlock(&rate_ctrl_mutex);
return -EALREADY;
}
}
alg = kzalloc(sizeof(*alg), GFP_KERNEL);
if (alg == NULL) {
mutex_unlock(&rate_ctrl_mutex);
return -ENOMEM;
}
alg->ops = ops;
list_add_tail(&alg->list, &rate_ctrl_algs);
mutex_unlock(&rate_ctrl_mutex);
return 0;
}
EXPORT_SYMBOL(ieee80211_rate_control_register);
void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
{
struct rate_control_alg *alg;
mutex_lock(&rate_ctrl_mutex);
list_for_each_entry(alg, &rate_ctrl_algs, list) {
if (alg->ops == ops) {
list_del(&alg->list);
kfree(alg);
break;
}
}
mutex_unlock(&rate_ctrl_mutex);
}
EXPORT_SYMBOL(ieee80211_rate_control_unregister);
static const struct rate_control_ops *
ieee80211_try_rate_control_ops_get(const char *name)
{
struct rate_control_alg *alg;
const struct rate_control_ops *ops = NULL;
if (!name)
return NULL;
mutex_lock(&rate_ctrl_mutex);
list_for_each_entry(alg, &rate_ctrl_algs, list) {
if (!strcmp(alg->ops->name, name)) {
ops = alg->ops;
break;
}
}
mutex_unlock(&rate_ctrl_mutex);
return ops;
}
/* Get the rate control algorithm. */
static const struct rate_control_ops *
ieee80211_rate_control_ops_get(const char *name)
{
const struct rate_control_ops *ops;
const char *alg_name;
kernel_param_lock(THIS_MODULE);
if (!name)
alg_name = ieee80211_default_rc_algo;
else
alg_name = name;
ops = ieee80211_try_rate_control_ops_get(alg_name);
if (!ops && name)
/* try default if specific alg requested but not found */
ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
/* try built-in one if specific alg requested but not found */
if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT))
ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
kernel_param_unlock(THIS_MODULE);
return ops;
}
#ifdef CONFIG_MAC80211_DEBUGFS
static ssize_t rcname_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct rate_control_ref *ref = file->private_data;
int len = strlen(ref->ops->name);
return simple_read_from_buffer(userbuf, count, ppos,
ref->ops->name, len);
}
static const struct file_operations rcname_ops = {
.read = rcname_read,
.open = simple_open,
.llseek = default_llseek,
};
#endif
static struct rate_control_ref *rate_control_alloc(const char *name,
struct ieee80211_local *local)
{
struct dentry *debugfsdir = NULL;
struct rate_control_ref *ref;
ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
if (!ref)
return NULL;
ref->local = local;
ref->ops = ieee80211_rate_control_ops_get(name);
if (!ref->ops)
goto free;
#ifdef CONFIG_MAC80211_DEBUGFS
debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
local->debugfs.rcdir = debugfsdir;
debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
#endif
ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
if (!ref->priv)
goto free;
return ref;
free:
kfree(ref);
return NULL;
}
static void rate_control_free(struct rate_control_ref *ctrl_ref)
{
ctrl_ref->ops->free(ctrl_ref->priv);
#ifdef CONFIG_MAC80211_DEBUGFS
debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir);
ctrl_ref->local->debugfs.rcdir = NULL;
#endif
kfree(ctrl_ref);
}
static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
{
struct sk_buff *skb = txrc->skb;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
__le16 fc;
fc = hdr->frame_control;
return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
IEEE80211_TX_CTL_USE_MINRATE)) ||
!ieee80211_is_data(fc);
}
static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
struct ieee80211_supported_band *sband)
{
u8 i;
if (basic_rates == 0)
return; /* assume basic rates unknown and accept rate */
if (*idx < 0)
return;
if (basic_rates & (1 << *idx))
return; /* selected rate is a basic rate */
for (i = *idx + 1; i <= sband->n_bitrates; i++) {
if (basic_rates & (1 << i)) {
*idx = i;
return;
}
}
/* could not find a basic rate; use original selection */
}
static void __rate_control_send_low(struct ieee80211_hw *hw,
struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta,
struct ieee80211_tx_info *info,
u32 rate_mask)
{
int i;
u32 rate_flags =
ieee80211_chandef_rate_flags(&hw->conf.chandef);
if ((sband->band == IEEE80211_BAND_2GHZ) &&
(info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
rate_flags |= IEEE80211_RATE_ERP_G;
info->control.rates[0].idx = 0;
for (i = 0; i < sband->n_bitrates; i++) {
if (!(rate_mask & BIT(i)))
continue;
if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
continue;
if (!rate_supported(sta, sband->band, i))
continue;
info->control.rates[0].idx = i;
break;
}
WARN_ON_ONCE(i == sband->n_bitrates);
info->control.rates[0].count =
(info->flags & IEEE80211_TX_CTL_NO_ACK) ?
1 : hw->max_rate_tries;
info->control.skip_table = 1;
}
bool rate_control_send_low(struct ieee80211_sta *pubsta,
void *priv_sta,
struct ieee80211_tx_rate_control *txrc)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
struct ieee80211_supported_band *sband = txrc->sband;
struct sta_info *sta;
int mcast_rate;
bool use_basicrate = false;
if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
__rate_control_send_low(txrc->hw, sband, pubsta, info,
txrc->rate_idx_mask);
if (!pubsta && txrc->bss) {
mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
if (mcast_rate > 0) {
info->control.rates[0].idx = mcast_rate - 1;
return true;
}
use_basicrate = true;
} else if (pubsta) {
sta = container_of(pubsta, struct sta_info, sta);
if (ieee80211_vif_is_mesh(&sta->sdata->vif))
use_basicrate = true;
}
if (use_basicrate)
rc_send_low_basicrate(&info->control.rates[0].idx,
txrc->bss_conf->basic_rates,
sband);
return true;
}
return false;
}
EXPORT_SYMBOL(rate_control_send_low);
static bool rate_idx_match_legacy_mask(struct ieee80211_tx_rate *rate,
int n_bitrates, u32 mask)
{
int j;
/* See whether the selected rate or anything below it is allowed. */
for (j = rate->idx; j >= 0; j--) {
if (mask & (1 << j)) {
/* Okay, found a suitable rate. Use it. */
rate->idx = j;
return true;
}
}
/* Try to find a higher rate that would be allowed */
for (j = rate->idx + 1; j < n_bitrates; j++) {
if (mask & (1 << j)) {
/* Okay, found a suitable rate. Use it. */
rate->idx = j;
return true;
}
}
return false;
}
static bool rate_idx_match_mcs_mask(struct ieee80211_tx_rate *rate,
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
{
int i, j;
int ridx, rbit;
ridx = rate->idx / 8;
rbit = rate->idx % 8;
/* sanity check */
if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
return false;
/* See whether the selected rate or anything below it is allowed. */
for (i = ridx; i >= 0; i--) {
for (j = rbit; j >= 0; j--)
if (mcs_mask[i] & BIT(j)) {
rate->idx = i * 8 + j;
return true;
}
rbit = 7;
}
/* Try to find a higher rate that would be allowed */
ridx = (rate->idx + 1) / 8;
rbit = (rate->idx + 1) % 8;
for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
for (j = rbit; j < 8; j++)
if (mcs_mask[i] & BIT(j)) {
rate->idx = i * 8 + j;
return true;
}
rbit = 0;
}
return false;
}
static void rate_idx_match_mask(struct ieee80211_tx_rate *rate,
struct ieee80211_supported_band *sband,
enum nl80211_chan_width chan_width,
u32 mask,
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN])
{
struct ieee80211_tx_rate alt_rate;
/* handle HT rates */
if (rate->flags & IEEE80211_TX_RC_MCS) {
if (rate_idx_match_mcs_mask(rate, mcs_mask))
return;
/* also try the legacy rates. */
alt_rate.idx = 0;
/* keep protection flags */
alt_rate.flags = rate->flags &
(IEEE80211_TX_RC_USE_RTS_CTS |
IEEE80211_TX_RC_USE_CTS_PROTECT |
IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
alt_rate.count = rate->count;
if (rate_idx_match_legacy_mask(&alt_rate,
sband->n_bitrates, mask)) {
*rate = alt_rate;
return;
}
} else if (!(rate->flags & IEEE80211_TX_RC_VHT_MCS)) {
/* handle legacy rates */
if (rate_idx_match_legacy_mask(rate, sband->n_bitrates, mask))
return;
/* if HT BSS, and we handle a data frame, also try HT rates */
switch (chan_width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_5:
case NL80211_CHAN_WIDTH_10:
return;
default:
break;
}
alt_rate.idx = 0;
/* keep protection flags */
alt_rate.flags = rate->flags &
(IEEE80211_TX_RC_USE_RTS_CTS |
IEEE80211_TX_RC_USE_CTS_PROTECT |
IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
alt_rate.count = rate->count;
alt_rate.flags |= IEEE80211_TX_RC_MCS;
if (chan_width == NL80211_CHAN_WIDTH_40)
alt_rate.flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
if (rate_idx_match_mcs_mask(&alt_rate, mcs_mask)) {
*rate = alt_rate;
return;
}
}
/*
* Uh.. No suitable rate exists. This should not really happen with
* sane TX rate mask configurations. However, should someone manage to
* configure supported rates and TX rate mask in incompatible way,
* allow the frame to be transmitted with whatever the rate control
* selected.
*/
}
static void rate_fixup_ratelist(struct ieee80211_vif *vif,
struct ieee80211_supported_band *sband,
struct ieee80211_tx_info *info,
struct ieee80211_tx_rate *rates,
int max_rates)
{
struct ieee80211_rate *rate;
bool inval = false;
int i;
/*
* Set up the RTS/CTS rate as the fastest basic rate
* that is not faster than the data rate unless there
* is no basic rate slower than the data rate, in which
* case we pick the slowest basic rate
*
* XXX: Should this check all retry rates?
*/
if (!(rates[0].flags &
(IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
u32 basic_rates = vif->bss_conf.basic_rates;
s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
rate = &sband->bitrates[rates[0].idx];
for (i = 0; i < sband->n_bitrates; i++) {
/* must be a basic rate */
if (!(basic_rates & BIT(i)))
continue;
/* must not be faster than the data rate */
if (sband->bitrates[i].bitrate > rate->bitrate)
continue;
/* maximum */
if (sband->bitrates[baserate].bitrate <
sband->bitrates[i].bitrate)
baserate = i;
}
info->control.rts_cts_rate_idx = baserate;
}
for (i = 0; i < max_rates; i++) {
/*
* make sure there's no valid rate following
* an invalid one, just in case drivers don't
* take the API seriously to stop at -1.
*/
if (inval) {
rates[i].idx = -1;
continue;
}
if (rates[i].idx < 0) {
inval = true;
continue;
}
/*
* For now assume MCS is already set up correctly, this
* needs to be fixed.
*/
if (rates[i].flags & IEEE80211_TX_RC_MCS) {
WARN_ON(rates[i].idx > 76);
if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
info->control.use_cts_prot)
rates[i].flags |=
IEEE80211_TX_RC_USE_CTS_PROTECT;
continue;
}
if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
continue;
}
/* set up RTS protection if desired */
if (info->control.use_rts) {
rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
info->control.use_cts_prot = false;
}
/* RC is busted */
if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
rates[i].idx = -1;
continue;
}
rate = &sband->bitrates[rates[i].idx];
/* set up short preamble */
if (info->control.short_preamble &&
rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
/* set up G protection */
if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
info->control.use_cts_prot &&
rate->flags & IEEE80211_RATE_ERP_G)
rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
}
}
static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
struct ieee80211_tx_info *info,
struct ieee80211_tx_rate *rates,
int max_rates)
{
struct ieee80211_sta_rates *ratetbl = NULL;
int i;
if (sta && !info->control.skip_table)
ratetbl = rcu_dereference(sta->rates);
/* Fill remaining rate slots with data from the sta rate table. */
max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
for (i = 0; i < max_rates; i++) {
if (i < ARRAY_SIZE(info->control.rates) &&
info->control.rates[i].idx >= 0 &&
info->control.rates[i].count) {
if (rates != info->control.rates)
rates[i] = info->control.rates[i];
} else if (ratetbl) {
rates[i].idx = ratetbl->rate[i].idx;
rates[i].flags = ratetbl->rate[i].flags;
if (info->control.use_rts)
rates[i].count = ratetbl->rate[i].count_rts;
else if (info->control.use_cts_prot)
rates[i].count = ratetbl->rate[i].count_cts;
else
rates[i].count = ratetbl->rate[i].count;
} else {
rates[i].idx = -1;
rates[i].count = 0;
}
if (rates[i].idx < 0 || !rates[i].count)
break;
}
}
static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *sta,
struct ieee80211_supported_band *sband,
struct ieee80211_tx_info *info,
struct ieee80211_tx_rate *rates,
int max_rates)
{
enum nl80211_chan_width chan_width;
u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
bool has_mcs_mask;
u32 mask;
u32 rate_flags;
int i;
/*
* Try to enforce the rateidx mask the user wanted. skip this if the
* default mask (allow all rates) is used to save some processing for
* the common case.
*/
mask = sdata->rc_rateidx_mask[info->band];
has_mcs_mask = sdata->rc_has_mcs_mask[info->band];
rate_flags =
ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
for (i = 0; i < sband->n_bitrates; i++)
if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
mask &= ~BIT(i);
if (mask == (1 << sband->n_bitrates) - 1 && !has_mcs_mask)
return;
if (has_mcs_mask)
memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[info->band],
sizeof(mcs_mask));
else
memset(mcs_mask, 0xff, sizeof(mcs_mask));
if (sta) {
/* Filter out rates that the STA does not support */
mask &= sta->supp_rates[info->band];
for (i = 0; i < sizeof(mcs_mask); i++)
mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
}
/*
* Make sure the rate index selected for each TX rate is
* included in the configured mask and change the rate indexes
* if needed.
*/
chan_width = sdata->vif.bss_conf.chandef.width;
for (i = 0; i < max_rates; i++) {
/* Skip invalid rates */
if (rates[i].idx < 0)
break;
rate_idx_match_mask(&rates[i], sband, chan_width, mask,
mcs_mask);
}
}
void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
struct ieee80211_sta *sta,
struct sk_buff *skb,
struct ieee80211_tx_rate *dest,
int max_rates)
{
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_supported_band *sband;
rate_control_fill_sta_table(sta, info, dest, max_rates);
if (!vif)
return;
sdata = vif_to_sdata(vif);
sband = sdata->local->hw.wiphy->bands[info->band];
if (ieee80211_is_data(hdr->frame_control))
rate_control_apply_mask(sdata, sta, sband, info, dest, max_rates);
if (dest[0].idx < 0)
__rate_control_send_low(&sdata->local->hw, sband, sta, info,
sdata->rc_rateidx_mask[info->band]);
if (sta)
rate_fixup_ratelist(vif, sband, info, dest, max_rates);
}
EXPORT_SYMBOL(ieee80211_get_tx_rates);
void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
struct ieee80211_tx_rate_control *txrc)
{
struct rate_control_ref *ref = sdata->local->rate_ctrl;
void *priv_sta = NULL;
struct ieee80211_sta *ista = NULL;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
int i;
if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
ista = &sta->sta;
priv_sta = sta->rate_ctrl_priv;
}
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
info->control.rates[i].idx = -1;
info->control.rates[i].flags = 0;
info->control.rates[i].count = 0;
}
if (sdata->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
return;
ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_RC_TABLE)
return;
ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
info->control.rates,
ARRAY_SIZE(info->control.rates));
}
int rate_control_set_rates(struct ieee80211_hw *hw,
struct ieee80211_sta *pubsta,
struct ieee80211_sta_rates *rates)
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
struct ieee80211_sta_rates *old;
/*
* mac80211 guarantees that this function will not be called
* concurrently, so the following RCU access is safe, even without
* extra locking. This can not be checked easily, so we just set
* the condition to true.
*/
old = rcu_dereference_protected(pubsta->rates, true);
rcu_assign_pointer(pubsta->rates, rates);
if (old)
kfree_rcu(old, rcu_head);
drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
return 0;
}
EXPORT_SYMBOL(rate_control_set_rates);
int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
const char *name)
{
struct rate_control_ref *ref;
ASSERT_RTNL();
if (local->open_count)
return -EBUSY;
if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) {
if (WARN_ON(!local->ops->set_rts_threshold))
return -EINVAL;
return 0;
}
ref = rate_control_alloc(name, local);
if (!ref) {
wiphy_warn(local->hw.wiphy,
"Failed to select rate control algorithm\n");
return -ENOENT;
}
WARN_ON(local->rate_ctrl);
local->rate_ctrl = ref;
wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
ref->ops->name);
return 0;
}
void rate_control_deinitialize(struct ieee80211_local *local)
{
struct rate_control_ref *ref;
ref = local->rate_ctrl;
if (!ref)
return;
local->rate_ctrl = NULL;
rate_control_free(ref);
}
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