+static ieee80211_txrx_result
+ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
+{
+ struct ieee80211_local *local = rx->local;
+ struct ieee80211_hw *hw = &local->hw;
+ struct sk_buff *skb = rx->skb;
+ struct ieee80211_bar *bar = (struct ieee80211_bar *) skb->data;
+ struct tid_ampdu_rx *tid_agg_rx;
+ u16 start_seq_num;
+ u16 tid;
+
+ if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
+ return TXRX_CONTINUE;
+
+ if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
+ if (!rx->sta)
+ return TXRX_CONTINUE;
+ tid = le16_to_cpu(bar->control) >> 12;
+ tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]);
+ if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
+ return TXRX_CONTINUE;
+
+ start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
+
+ /* reset session timer */
+ if (tid_agg_rx->timeout) {
+ unsigned long expires =
+ jiffies + (tid_agg_rx->timeout / 1000) * HZ;
+ mod_timer(&tid_agg_rx->session_timer, expires);
+ }
+
+ /* manage reordering buffer according to requested */
+ /* sequence number */
+ rcu_read_lock();
+ ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
+ start_seq_num, 1);
+ rcu_read_unlock();
+ return TXRX_DROP;
+ }
+
+ return TXRX_CONTINUE;
+}
+