diff options
Diffstat (limited to 'package/mac80211/patches/408-ath9k-serialize-ath9k_ps_-wakeup-restore-calls.patch')
| -rw-r--r-- | package/mac80211/patches/408-ath9k-serialize-ath9k_ps_-wakeup-restore-calls.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/package/mac80211/patches/408-ath9k-serialize-ath9k_ps_-wakeup-restore-calls.patch b/package/mac80211/patches/408-ath9k-serialize-ath9k_ps_-wakeup-restore-calls.patch new file mode 100644 index 0000000000..01318fb2f7 --- /dev/null +++ b/package/mac80211/patches/408-ath9k-serialize-ath9k_ps_-wakeup-restore-calls.patch @@ -0,0 +1,82 @@ +From 7446da6910f1368273a55ca99acba18828306a6e Mon Sep 17 00:00:00 2001 +From: Gabor Juhos <juhosg@openwrt.org> +Date: Sun, 21 Jun 2009 16:59:53 +0200 +Subject: [PATCH 3/3] ath9k: serialize ath9k_ps_{wakeup,restore} calls + +These functions are changing the power mode of the chip, but this may +have unpredictable effects, if another code are trying to set the power +mode via 'ath9k_hw_setpower' in the same time from another context. + +Changes-licensed-under: ISC +Signed-off-by: Gabor Juhos <juhosg@openwrt.org> +--- + drivers/net/wireless/ath/ath9k/ath9k.h | 2 +- + drivers/net/wireless/ath/ath9k/hw.c | 42 ++++++++++++++++++++++---------- + 2 files changed, 30 insertions(+), 14 deletions(-) + +--- a/drivers/net/wireless/ath/ath9k/ath9k.h ++++ b/drivers/net/wireless/ath/ath9k/ath9k.h +@@ -561,7 +561,7 @@ struct ath_softc { + u32 keymax; + DECLARE_BITMAP(keymap, ATH_KEYMAX); + u8 splitmic; +- atomic_t ps_usecount; ++ unsigned long ps_usecount; + enum ath9k_int imask; + enum ath9k_ht_extprotspacing ht_extprotspacing; + enum ath9k_ht_macmode tx_chan_width; +--- a/drivers/net/wireless/ath/ath9k/hw.c ++++ b/drivers/net/wireless/ath/ath9k/hw.c +@@ -2787,23 +2787,39 @@ bool ath9k_hw_setpower(struct ath_hw *ah + + void ath9k_ps_wakeup(struct ath_softc *sc) + { +- if (atomic_inc_return(&sc->ps_usecount) == 1) +- if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) { +- sc->sc_ah->restore_mode = sc->sc_ah->power_mode; +- ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE); +- } ++ unsigned long flags; ++ ++ spin_lock_irqsave(&sc->sc_pm_lock, flags); ++ if (++sc->ps_usecount != 1) ++ goto unlock; ++ ++ if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) { ++ sc->sc_ah->restore_mode = sc->sc_ah->power_mode; ++ ath9k_hw_setpower_nolock(sc->sc_ah, ATH9K_PM_AWAKE); ++ } ++ ++ unlock: ++ spin_unlock_irqrestore(&sc->sc_pm_lock, flags); + } + + void ath9k_ps_restore(struct ath_softc *sc) + { +- if (atomic_dec_and_test(&sc->ps_usecount)) +- if ((sc->hw->conf.flags & IEEE80211_CONF_PS) && +- !(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON | +- SC_OP_WAIT_FOR_CAB | +- SC_OP_WAIT_FOR_PSPOLL_DATA | +- SC_OP_WAIT_FOR_TX_ACK))) +- ath9k_hw_setpower(sc->sc_ah, +- sc->sc_ah->restore_mode); ++ unsigned long flags; ++ ++ spin_lock_irqsave(&sc->sc_pm_lock, flags); ++ if (--sc->ps_usecount != 0) ++ goto unlock; ++ ++ if ((sc->hw->conf.flags & IEEE80211_CONF_PS) && ++ !(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON | ++ SC_OP_WAIT_FOR_CAB | ++ SC_OP_WAIT_FOR_PSPOLL_DATA | ++ SC_OP_WAIT_FOR_TX_ACK))) ++ ath9k_hw_setpower_nolock(sc->sc_ah, ++ sc->sc_ah->restore_mode); ++ ++ unlock: ++ spin_unlock_irqrestore(&sc->sc_pm_lock, flags); + } + + /* |