ath9k: remove unnecessary power save flags.

drv_config callback is called only after the ack for the nullframe
is received and so driver need not do anything special for this.

So remove NULLFUNC_COMPLETED, PS_ENABLED flags and bf_isnullfunc
flags from ath9k as mac80211 already handles them properly.
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -241,7 +241,6 @@ struct ath_buf {
 	dma_addr_t bf_daddr;		/* physical addr of desc */
 	dma_addr_t bf_buf_addr;		/* physical addr of data buffer */
 	bool bf_stale;
-	bool bf_isnullfunc;
 	bool bf_tx_aborted;
 	u16 bf_flags;
 	struct ath_buf_state bf_state;
@@ -349,7 +348,6 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
 		      u16 tid, u16 *ssn);
 void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
 void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
-void ath9k_enable_ps(struct ath_softc *sc);
 
 /********/
 /* VIFs */
@@ -573,8 +571,6 @@ struct ath_ant_comb {
 #define PS_WAIT_FOR_PSPOLL_DATA   BIT(2)
 #define PS_WAIT_FOR_TX_ACK        BIT(3)
 #define PS_BEACON_SYNC            BIT(4)
-#define PS_NULLFUNC_COMPLETED     BIT(5)
-#define PS_ENABLED                BIT(6)
 
 struct ath_wiphy;
 struct ath_rate_table;

drivers/net/wireless/ath/ath9k/main.c

@@ -1484,7 +1484,7 @@ static void ath9k_remove_interface(struct ieee80211_hw *hw,
 	mutex_unlock(&sc->mutex);
 }
 
-void ath9k_enable_ps(struct ath_softc *sc)
+static void ath9k_enable_ps(struct ath_softc *sc)
 {
 	struct ath_hw *ah = sc->sc_ah;
 
@@ -1551,20 +1551,10 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 	if (changed & IEEE80211_CONF_CHANGE_PS) {
 		unsigned long flags;
 		spin_lock_irqsave(&sc->sc_pm_lock, flags);
-		if (conf->flags & IEEE80211_CONF_PS) {
-			sc->ps_flags |= PS_ENABLED;
-			/*
-			 * At this point we know hardware has received an ACK
-			 * of a previously sent null data frame.
-			 */
-			if ((sc->ps_flags & PS_NULLFUNC_COMPLETED)) {
-				sc->ps_flags &= ~PS_NULLFUNC_COMPLETED;
-				ath9k_enable_ps(sc);
-                        }
-		} else {
+		if (conf->flags & IEEE80211_CONF_PS)
+			ath9k_enable_ps(sc);
+		else {
 			sc->ps_enabled = false;
-			sc->ps_flags &= ~(PS_ENABLED |
-					  PS_NULLFUNC_COMPLETED);
 			ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
 			if (!(ah->caps.hw_caps &
 			      ATH9K_HW_CAP_AUTOSLEEP)) {

drivers/net/wireless/ath/ath9k/xmit.c

@@ -1648,13 +1648,6 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
 
 	bf->bf_buf_addr = bf->bf_dmacontext;
 
-	/* tag if this is a nullfunc frame to enable PS when AP acks it */
-	if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc)) {
-		bf->bf_isnullfunc = true;
-		sc->ps_flags &= ~PS_NULLFUNC_COMPLETED;
-	} else
-		bf->bf_isnullfunc = false;
-
 	bf->bf_tx_aborted = false;
 
 	return 0;
@@ -2081,18 +2074,6 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
 			break;
 		}
 
-		/*
-		 * We now know the nullfunc frame has been ACKed so we
-		 * can disable RX.
-		 */
-		if (bf->bf_isnullfunc &&
-		    (ts.ts_status & ATH9K_TX_ACKED)) {
-			if ((sc->ps_flags & PS_ENABLED))
-				ath9k_enable_ps(sc);
-			else
-				sc->ps_flags |= PS_NULLFUNC_COMPLETED;
-		}
-
 		/*
 		 * Remove ath_buf's of the same transmit unit from txq,
 		 * however leave the last descriptor back as the holding
@@ -2236,17 +2217,6 @@ void ath_tx_edma_tasklet(struct ath_softc *sc)
 
 		txok = !(txs.ts_status & ATH9K_TXERR_MASK);
 
-		/*
-		 * Make sure null func frame is acked before configuring
-		 * hw into ps mode.
-		 */
-		if (bf->bf_isnullfunc && txok) {
-			if ((sc->ps_flags & PS_ENABLED))
-				ath9k_enable_ps(sc);
-			else
-				sc->ps_flags |= PS_NULLFUNC_COMPLETED;
-		}
-
 		if (!bf_isampdu(bf)) {
 			if (txs.ts_status & ATH9K_TXERR_XRETRY)
 				bf->bf_state.bf_type |= BUF_XRETRY;