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mac80211: fix multi-use timer

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We have, sometimes, multiple things that want to
run but don't have their own timer. Introduce a
new function to mac80211's mlme run_again() that
makes sure that the timer will run again at the
_first_ needed time, use that function and also
properly reprogram the timer once it fired.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-07-10 02:39:48 +02:00 committed by John W. Linville
parent 01a7e08436
commit ca386f3137
1 changed files with 33 additions and 7 deletions
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40
net/mac80211/mlme.c
View file

@ -72,6 +72,26 @@ static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
WARN_ON(!mutex_is_locked(&ifmgd->mtx));
}
/*
* We can have multiple work items (and connection probing)
* scheduling this timer, but we need to take care to only
* reschedule it when it should fire _earlier_ than it was
* asked for before, or if it's not pending right now. This
* function ensures that. Note that it then is required to
* run this function for all timeouts after the first one
* has happened -- the work that runs from this timer will
* do that.
*/
static void run_again(struct ieee80211_if_managed *ifmgd,
unsigned long timeout)
{
ASSERT_MGD_MTX(ifmgd);
if (!timer_pending(&ifmgd->timer) ||
time_before(timeout, ifmgd->timer.expires))
mod_timer(&ifmgd->timer, timeout);
}
static int ecw2cw(int ecw)
{
return (1 << ecw) - 1;
@ -916,7 +936,7 @@ ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
ieee80211_send_probe_req(sdata, NULL, wk->ssid, wk->ssid_len, NULL, 0);
wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
mod_timer(&ifmgd->timer, wk->timeout);
run_again(ifmgd, wk->timeout);
return RX_MGMT_NONE;
}
@ -958,7 +978,7 @@ ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
wk->auth_transaction = 2;
wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
mod_timer(&ifmgd->timer, wk->timeout);
run_again(ifmgd, wk->timeout);
return RX_MGMT_NONE;
}
@ -1079,7 +1099,7 @@ ieee80211_associate(struct ieee80211_sub_if_data *sdata,
ieee80211_send_assoc(sdata, wk);
wk->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
mod_timer(&ifmgd->timer, wk->timeout);
run_again(ifmgd, wk->timeout);
return RX_MGMT_NONE;
}
@ -1140,7 +1160,7 @@ void ieee80211_beacon_loss_work(struct work_struct *work)
ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
ssid + 2, ssid[1], NULL, 0);
mod_timer(&ifmgd->timer, jiffies + IEEE80211_PROBE_WAIT);
run_again(ifmgd, jiffies + IEEE80211_PROBE_WAIT);
out:
mutex_unlock(&ifmgd->mtx);
}
@ -1350,8 +1370,7 @@ ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
sdata->dev->name, tu, ms);
wk->timeout = jiffies + msecs_to_jiffies(ms);
if (ms > IEEE80211_ASSOC_TIMEOUT)
mod_timer(&ifmgd->timer,
jiffies + msecs_to_jiffies(ms));
run_again(ifmgd, jiffies + msecs_to_jiffies(ms));
return RX_MGMT_NONE;
}
@ -1981,8 +2000,15 @@ static void ieee80211_sta_work(struct work_struct *work)
}
list_for_each_entry_safe(wk, tmp, &ifmgd->work_list, list) {
if (time_before(jiffies, wk->timeout))
if (time_is_after_jiffies(wk->timeout)) {
/*
* This work item isn't supposed to be worked on
* right now, but take care to adjust the timer
* properly.
*/
run_again(ifmgd, wk->timeout);
continue;
}
switch (wk->state) {
default: