From c6c539f023423a7a730f5759be1b3b45c2d1d1ca Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 14 Sep 2011 21:24:24 +0200
Subject: [PATCH] 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>
---
drivers/net/wireless/ath/ath9k/main.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 8149511e8f7e4..7910165cf0e68 100644
--- 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);
--
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