267 lines
8.0 KiB
C
267 lines
8.0 KiB
C
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/*
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* Off-channel operation helpers
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2004, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-trace.h"
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/*
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* Tell our hardware to disable PS.
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* Optionally inform AP that we will go to sleep so that it will buffer
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* the frames while we are doing off-channel work. This is optional
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* because we *may* be doing work on-operating channel, and want our
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* hardware unconditionally awake, but still let the AP send us normal frames.
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*/
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static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata,
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bool tell_ap)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
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local->offchannel_ps_enabled = false;
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/* FIXME: what to do when local->pspolling is true? */
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del_timer_sync(&local->dynamic_ps_timer);
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del_timer_sync(&ifmgd->bcn_mon_timer);
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del_timer_sync(&ifmgd->conn_mon_timer);
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cancel_work_sync(&local->dynamic_ps_enable_work);
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if (local->hw.conf.flags & IEEE80211_CONF_PS) {
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local->offchannel_ps_enabled = true;
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local->hw.conf.flags &= ~IEEE80211_CONF_PS;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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}
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if (tell_ap && (!local->offchannel_ps_enabled ||
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!(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)))
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/*
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* If power save was enabled, no need to send a nullfunc
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* frame because AP knows that we are sleeping. But if the
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* hardware is creating the nullfunc frame for power save
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* status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
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* enabled) and power save was enabled, the firmware just
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* sent a null frame with power save disabled. So we need
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* to send a new nullfunc frame to inform the AP that we
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* are again sleeping.
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*/
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ieee80211_send_nullfunc(local, sdata, 1);
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}
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/* inform AP that we are awake again, unless power save is enabled */
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static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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if (!local->ps_sdata)
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ieee80211_send_nullfunc(local, sdata, 0);
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else if (local->offchannel_ps_enabled) {
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/*
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* In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
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* will send a nullfunc frame with the powersave bit set
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* even though the AP already knows that we are sleeping.
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* This could be avoided by sending a null frame with power
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* save bit disabled before enabling the power save, but
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* this doesn't gain anything.
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*
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* When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
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* to send a nullfunc frame because AP already knows that
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* we are sleeping, let's just enable power save mode in
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* hardware.
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*/
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/* TODO: Only set hardware if CONF_PS changed?
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* TODO: Should we set offchannel_ps_enabled to false?
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*/
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local->hw.conf.flags |= IEEE80211_CONF_PS;
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ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
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} else if (local->hw.conf.dynamic_ps_timeout > 0) {
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/*
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* If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
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* had been running before leaving the operating channel,
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* restart the timer now and send a nullfunc frame to inform
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* the AP that we are awake.
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*/
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ieee80211_send_nullfunc(local, sdata, 0);
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mod_timer(&local->dynamic_ps_timer, jiffies +
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msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
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}
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ieee80211_sta_reset_beacon_monitor(sdata);
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ieee80211_sta_reset_conn_monitor(sdata);
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}
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void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local,
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bool offchannel_ps_enable)
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{
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struct ieee80211_sub_if_data *sdata;
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/*
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* notify the AP about us leaving the channel and stop all
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* STA interfaces.
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*/
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (!ieee80211_sdata_running(sdata))
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continue;
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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/* Check to see if we should disable beaconing. */
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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ieee80211_bss_info_change_notify(
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sdata, BSS_CHANGED_BEACON_ENABLED);
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
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netif_tx_stop_all_queues(sdata->dev);
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if (offchannel_ps_enable &&
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(sdata->vif.type == NL80211_IFTYPE_STATION) &&
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sdata->u.mgd.associated)
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ieee80211_offchannel_ps_enable(sdata, true);
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}
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}
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mutex_unlock(&local->iflist_mtx);
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}
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void ieee80211_offchannel_return(struct ieee80211_local *local,
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bool offchannel_ps_disable)
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{
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
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clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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if (!ieee80211_sdata_running(sdata))
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continue;
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/* Tell AP we're back */
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if (offchannel_ps_disable &&
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sdata->vif.type == NL80211_IFTYPE_STATION) {
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if (sdata->u.mgd.associated)
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ieee80211_offchannel_ps_disable(sdata);
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}
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if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
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/*
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* This may wake up queues even though the driver
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* currently has them stopped. This is not very
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* likely, since the driver won't have gotten any
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* (or hardly any) new packets while we weren't
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* on the right channel, and even if it happens
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* it will at most lead to queueing up one more
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* packet per queue in mac80211 rather than on
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* the interface qdisc.
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*/
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netif_tx_wake_all_queues(sdata->dev);
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}
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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ieee80211_bss_info_change_notify(
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sdata, BSS_CHANGED_BEACON_ENABLED);
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}
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mutex_unlock(&local->iflist_mtx);
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}
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static void ieee80211_hw_roc_start(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, hw_roc_start);
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struct ieee80211_sub_if_data *sdata;
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mutex_lock(&local->mtx);
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if (!local->hw_roc_channel) {
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mutex_unlock(&local->mtx);
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return;
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}
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if (local->hw_roc_skb) {
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sdata = IEEE80211_DEV_TO_SUB_IF(local->hw_roc_dev);
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ieee80211_tx_skb(sdata, local->hw_roc_skb);
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local->hw_roc_skb = NULL;
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} else {
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cfg80211_ready_on_channel(local->hw_roc_dev,
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local->hw_roc_cookie,
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local->hw_roc_channel,
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local->hw_roc_channel_type,
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local->hw_roc_duration,
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GFP_KERNEL);
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}
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ieee80211_recalc_idle(local);
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mutex_unlock(&local->mtx);
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}
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void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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trace_api_ready_on_channel(local);
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ieee80211_queue_work(hw, &local->hw_roc_start);
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}
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EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
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static void ieee80211_hw_roc_done(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, hw_roc_done);
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mutex_lock(&local->mtx);
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if (!local->hw_roc_channel) {
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mutex_unlock(&local->mtx);
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return;
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}
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if (!local->hw_roc_for_tx)
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cfg80211_remain_on_channel_expired(local->hw_roc_dev,
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local->hw_roc_cookie,
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local->hw_roc_channel,
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local->hw_roc_channel_type,
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GFP_KERNEL);
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local->hw_roc_channel = NULL;
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local->hw_roc_cookie = 0;
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ieee80211_recalc_idle(local);
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mutex_unlock(&local->mtx);
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}
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void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
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{
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struct ieee80211_local *local = hw_to_local(hw);
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trace_api_remain_on_channel_expired(local);
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ieee80211_queue_work(hw, &local->hw_roc_done);
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}
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EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
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void ieee80211_hw_roc_setup(struct ieee80211_local *local)
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{
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INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
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INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
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}
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