1 files changed, 25 insertions, 0 deletions

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 6fcc85a2806a..daf81048c1f7 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -184,6 +184,7 @@ static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
 {
         struct ieee80211_local *local = tx->local;
+        struct ieee80211_if_managed *ifmgd;
 
         /* driver doesn't support power save */
         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
@@ -208,6 +209,30 @@ ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
         if (local->quiescing)
                 return TX_CONTINUE;
 
+        /* dynamic ps is supported only in managed mode */
+        if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
+                return TX_CONTINUE;
+
+        ifmgd = &tx->sdata->u.mgd;
+
+        /*
+         * Don't wakeup from power save if u-apsd is enabled, voip ac has
+         * u-apsd enabled and the frame is in voip class. This effectively
+         * means that even if all access categories have u-apsd enabled, in
+         * practise u-apsd is only used with the voip ac. This is a
+         * workaround for the case when received voip class packets do not
+         * have correct qos tag for some reason, due the network or the
+         * peer application.
+         *
+         * Note: local->uapsd_queues access is racy here. If the value is
+         * changed via debugfs, user needs to reassociate manually to have
+         * everything in sync.
+         */
+        if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
+            && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
+            && skb_get_queue_mapping(tx->skb) == 0)
+                return TX_CONTINUE;
+
         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
                 ieee80211_stop_queues_by_reason(&local->hw,
                                                 IEEE80211_QUEUE_STOP_REASON_PS);