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83 lines
2.6 KiB
Diff
83 lines
2.6 KiB
Diff
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From 7446da6910f1368273a55ca99acba18828306a6e Mon Sep 17 00:00:00 2001
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From: Gabor Juhos <juhosg@openwrt.org>
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Date: Sun, 21 Jun 2009 16:59:53 +0200
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Subject: [PATCH 3/3] ath9k: serialize ath9k_ps_{wakeup,restore} calls
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These functions are changing the power mode of the chip, but this may
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have unpredictable effects, if another code are trying to set the power
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mode via 'ath9k_hw_setpower' in the same time from another context.
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Changes-licensed-under: ISC
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Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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---
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drivers/net/wireless/ath/ath9k/ath9k.h | 2 +-
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drivers/net/wireless/ath/ath9k/hw.c | 42 ++++++++++++++++++++++----------
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2 files changed, 30 insertions(+), 14 deletions(-)
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--- a/drivers/net/wireless/ath/ath9k/ath9k.h
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+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
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@@ -561,7 +561,7 @@ struct ath_softc {
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u32 keymax;
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DECLARE_BITMAP(keymap, ATH_KEYMAX);
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u8 splitmic;
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- atomic_t ps_usecount;
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+ unsigned long ps_usecount;
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enum ath9k_int imask;
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enum ath9k_ht_extprotspacing ht_extprotspacing;
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enum ath9k_ht_macmode tx_chan_width;
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--- a/drivers/net/wireless/ath/ath9k/hw.c
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+++ b/drivers/net/wireless/ath/ath9k/hw.c
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@@ -2787,23 +2787,39 @@ bool ath9k_hw_setpower(struct ath_hw *ah
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void ath9k_ps_wakeup(struct ath_softc *sc)
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{
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- if (atomic_inc_return(&sc->ps_usecount) == 1)
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- if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
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- sc->sc_ah->restore_mode = sc->sc_ah->power_mode;
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- ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
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- }
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&sc->sc_pm_lock, flags);
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+ if (++sc->ps_usecount != 1)
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+ goto unlock;
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+
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+ if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
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+ sc->sc_ah->restore_mode = sc->sc_ah->power_mode;
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+ ath9k_hw_setpower_nolock(sc->sc_ah, ATH9K_PM_AWAKE);
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+ }
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+
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+ unlock:
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+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
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}
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void ath9k_ps_restore(struct ath_softc *sc)
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{
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- if (atomic_dec_and_test(&sc->ps_usecount))
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- if ((sc->hw->conf.flags & IEEE80211_CONF_PS) &&
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- !(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
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- SC_OP_WAIT_FOR_CAB |
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- SC_OP_WAIT_FOR_PSPOLL_DATA |
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- SC_OP_WAIT_FOR_TX_ACK)))
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- ath9k_hw_setpower(sc->sc_ah,
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- sc->sc_ah->restore_mode);
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+ unsigned long flags;
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+
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+ spin_lock_irqsave(&sc->sc_pm_lock, flags);
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+ if (--sc->ps_usecount != 0)
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+ goto unlock;
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+
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+ if ((sc->hw->conf.flags & IEEE80211_CONF_PS) &&
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+ !(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
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+ SC_OP_WAIT_FOR_CAB |
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+ SC_OP_WAIT_FOR_PSPOLL_DATA |
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+ SC_OP_WAIT_FOR_TX_ACK)))
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+ ath9k_hw_setpower_nolock(sc->sc_ah,
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+ sc->sc_ah->restore_mode);
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+
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+ unlock:
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+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
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}
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/*
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