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mac80211: enable power save only if DTIM period is available

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Generally, the DTIM period is available after a beacon has
been received, and if no beacon has been received enabling
powersave is problematic anyway for synchronisation. Since
some drivers may require the DTIM period for powersave,
don't enable powersave until it becomes available in case
the scan/association managed to not receive a beacon.

Signed-off-by: Alexander Bondar <alexander.bondar@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alexander Bondar 2013-05-06 17:17:04 +03:00 committed by Johannes Berg
parent 0d4261ad5d
commit ce85788846
1 changed files with 4 additions and 0 deletions
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4
net/mac80211/mlme.c
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@ -1390,6 +1390,9 @@ static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
IEEE80211_STA_CONNECTION_POLL))
return false;
if (!sdata->vif.bss_conf.dtim_period)
return false;
rcu_read_lock();
sta = sta_info_get(sdata, mgd->bssid);
if (sta)
@ -3126,6 +3129,7 @@ ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
}
changed |= BSS_CHANGED_DTIM_PERIOD;
ieee80211_recalc_ps_vif(sdata);
}
if (elems.erp_info) {