ath9k: optimize ath9k_ps_restore

ath_hw_cycle_counters_update only needs to be called if the power state
changes. Most of the time this does not happen, even when ps_usecount
goes down to 0.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 8149511..7910165 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -111,24 +111,29 @@ void ath9k_ps_wakeup(struct ath_softc *sc)
 void ath9k_ps_restore(struct ath_softc *sc)
 {
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+       enum ath9k_power_mode mode;
        unsigned long flags;
 
        spin_lock_irqsave(&sc->sc_pm_lock, flags);
        if (--sc->ps_usecount != 0)
                goto unlock;
 
-       spin_lock(&common->cc_lock);
-       ath_hw_cycle_counters_update(common);
-       spin_unlock(&common->cc_lock);
-
        if (sc->ps_idle)
-               ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_FULL_SLEEP);
+               mode = ATH9K_PM_FULL_SLEEP;
        else if (sc->ps_enabled &&
                 !(sc->ps_flags & (PS_WAIT_FOR_BEACON |
                              PS_WAIT_FOR_CAB |
                              PS_WAIT_FOR_PSPOLL_DATA |
                              PS_WAIT_FOR_TX_ACK)))
-               ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
+               mode = ATH9K_PM_NETWORK_SLEEP;
+       else
+               goto unlock;
+
+       spin_lock(&common->cc_lock);
+       ath_hw_cycle_counters_update(common);
+       spin_unlock(&common->cc_lock);
+
+       ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_NETWORK_SLEEP);
 
  unlock:
        spin_unlock_irqrestore(&sc->sc_pm_lock, flags);