--- net/mac80211/main.c

+++ net/mac80211/main.c

@@ -441,6 +441,7 @@ void ieee80211_tx_status(struct ieee8021

rcu_read_lock();

sband = local->hw.wiphy->bands[info->band];

+ fc = hdr->frame_control;

sta = sta_info_get(local, hdr->addr1);

@@ -522,6 +523,20 @@ void ieee80211_tx_status(struct ieee8021

local->dot11FailedCount++;

}

+ if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&

+ (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&

+ !(info->flags & IEEE80211_TX_CTL_INJECTED) &&

+ local->ps_sdata && !(local->scanning)) {

+ if (info->flags & IEEE80211_TX_STAT_ACK) {

+ local->ps_sdata->u.mgd.flags |=

+ IEEE80211_STA_NULLFUNC_ACKED;

+ ieee80211_queue_work(&local->hw,

+ &local->dynamic_ps_enable_work);

+ } else

+ mod_timer(&local->dynamic_ps_timer, jiffies +

+ msecs_to_jiffies(10));

+ }

+

/* this was a transmitted frame, but now we want to reuse it */

skb_orphan(skb);