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mac80211: cancel/restart all timers across suspend/resume

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We forgot to cancel all timers in mac80211 when suspending.
In particular we forgot to deal with some things that can
cause hardware reconfiguration -- while it is down.

While at it we go ahead and add a warning in ieee80211_sta_work()
if its run while the suspend->resume cycle is in effect. This
should not happen and if it does it would indicate there is
a bug lurking in either mac80211 or mac80211 drivers.

With this now wpa_supplicant doesn't blink when I go to suspend
and resume where as before there where issues with some timers
running during the suspend->resume cycle. This caused a lot of
incorrect assumptions and would at times bring back the device
in an incoherent, but mostly recoverable, state.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2009-05-17 11:40:42 +02:00
committed by John W. Linville
parent cc32abd494
commit 5bb644a0fd
12 changed files with 321 additions and 19 deletions
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43
net/mac80211/util.c
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@@ -1034,6 +1034,13 @@ int ieee80211_reconfig(struct ieee80211_local *local)
struct sta_info *sta;
unsigned long flags;
int res;
bool from_suspend = local->suspended;
/*
* We're going to start the hardware, at that point
* we are no longer suspended and can RX frames.
*/
local->suspended = false;
/* restart hardware */
if (local->open_count) {
@@ -1058,6 +1065,7 @@ int ieee80211_reconfig(struct ieee80211_local *local)
if (local->ops->sta_notify) {
spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry(sta, &local->sta_list, list) {
sdata = sta->sdata;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
sdata = container_of(sdata->bss,
struct ieee80211_sub_if_data,
@@ -1128,5 +1136,40 @@ int ieee80211_reconfig(struct ieee80211_local *local)
ieee80211_wake_queues_by_reason(hw,
IEEE80211_QUEUE_STOP_REASON_SUSPEND);
/*
* If this is for hw restart things are still running.
* We may want to change that later, however.
*/
if (!from_suspend)
return 0;
#ifdef CONFIG_PM
local->suspended = false;
list_for_each_entry(sdata, &local->interfaces, list) {
switch(sdata->vif.type) {
case NL80211_IFTYPE_STATION:
ieee80211_sta_restart(sdata);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_restart(sdata);
break;
case NL80211_IFTYPE_MESH_POINT:
ieee80211_mesh_restart(sdata);
break;
default:
break;
}
}
add_timer(&local->sta_cleanup);
spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry(sta, &local->sta_list, list)
mesh_plink_restart(sta);
spin_unlock_irqrestore(&local->sta_lock, flags);
#else
WARN_ON(1);
#endif
return 0;
}