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linux-next/net/mac80211/pm.c
Sujith 722f069a6d mac80211: Tear down aggregation sessions for suspend/resume
When the driver has been notified with a STA_REMOVE, it tears down
the internal ADDBA state. On resume, trying to initiate aggregation would
fail because mac80211 has not cleared the operational state for that <TID,STA>.
This can be fixed by tearing down the existing sessions on a suspend.

Also, the driver can initiate a new BA session when suspend is in progress.
This is fixed by marking the station as being in suspend state and
denying ADDBA requests for such STAs.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-03-27 20:12:55 -04:00

151 lines
3.7 KiB
C

#include <net/mac80211.h>
#include <net/rtnetlink.h>
#include "ieee80211_i.h"
#include "led.h"
int __ieee80211_suspend(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_init_conf conf;
struct sta_info *sta;
unsigned long flags;
ieee80211_stop_queues_by_reason(hw,
IEEE80211_QUEUE_STOP_REASON_SUSPEND);
flush_workqueue(local->hw.workqueue);
/* disable keys */
list_for_each_entry(sdata, &local->interfaces, list)
ieee80211_disable_keys(sdata);
/* Tear down aggregation sessions */
rcu_read_lock();
if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
list_for_each_entry_rcu(sta, &local->sta_list, list) {
set_sta_flags(sta, WLAN_STA_SUSPEND);
ieee80211_sta_tear_down_BA_sessions(sta);
}
}
rcu_read_unlock();
/* remove STAs */
if (local->ops->sta_notify) {
spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry(sta, &local->sta_list, list) {
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
sdata = container_of(sdata->bss,
struct ieee80211_sub_if_data,
u.ap);
local->ops->sta_notify(hw, &sdata->vif,
STA_NOTIFY_REMOVE, &sta->sta);
}
spin_unlock_irqrestore(&local->sta_lock, flags);
}
/* remove all interfaces */
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
sdata->vif.type != NL80211_IFTYPE_MONITOR &&
netif_running(sdata->dev)) {
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = sdata->dev->dev_addr;
local->ops->remove_interface(hw, &conf);
}
}
/* flush again, in case driver queued work */
flush_workqueue(local->hw.workqueue);
/* stop hardware */
if (local->open_count) {
ieee80211_led_radio(local, false);
local->ops->stop(hw);
}
return 0;
}
int __ieee80211_resume(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
struct ieee80211_if_init_conf conf;
struct sta_info *sta;
unsigned long flags;
int res;
/* restart hardware */
if (local->open_count) {
res = local->ops->start(hw);
ieee80211_led_radio(local, hw->conf.radio_enabled);
}
/* add interfaces */
list_for_each_entry(sdata, &local->interfaces, list) {
if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
sdata->vif.type != NL80211_IFTYPE_MONITOR &&
netif_running(sdata->dev)) {
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = sdata->dev->dev_addr;
res = local->ops->add_interface(hw, &conf);
}
}
/* add STAs back */
if (local->ops->sta_notify) {
spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry(sta, &local->sta_list, list) {
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
sdata = container_of(sdata->bss,
struct ieee80211_sub_if_data,
u.ap);
local->ops->sta_notify(hw, &sdata->vif,
STA_NOTIFY_ADD, &sta->sta);
}
spin_unlock_irqrestore(&local->sta_lock, flags);
}
/* Clear Suspend state so that ADDBA requests can be processed */
rcu_read_lock();
if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
list_for_each_entry_rcu(sta, &local->sta_list, list) {
clear_sta_flags(sta, WLAN_STA_SUSPEND);
}
}
rcu_read_unlock();
/* add back keys */
list_for_each_entry(sdata, &local->interfaces, list)
if (netif_running(sdata->dev))
ieee80211_enable_keys(sdata);
/* setup RTS threshold */
if (local->ops->set_rts_threshold)
local->ops->set_rts_threshold(hw, local->rts_threshold);
/* reconfigure hardware */
ieee80211_hw_config(local, ~0);
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
ieee80211_wake_queues_by_reason(hw,
IEEE80211_QUEUE_STOP_REASON_SUSPEND);
return 0;
}