From: Luis R. Rodriguez Date: Tue, 26 Oct 2010 22:27:23 +0000 (-0700) Subject: ath9k: simplify hw reset locking X-Git-Tag: v2.6.36.4~124 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ea728e5324acf9f47176c00dbf094d1f9dd2dddb;p=karo-tx-linux.git ath9k: simplify hw reset locking commit 9d94674ab754be0e275120a183670ead435f9c0d upstream. The new PCU lock is better placed so we can just contend against that when trying to reset hardware. This is part of a series of patches which fix stopping TX DMA completley when requested on the driver. For more details about this issue refer to this thread: http://marc.info/?l=linux-wireless&m=128629803703756&w=2 Tested-by: Ben Greear Cc: Kyungwan Nam Signed-off-by: Luis R. Rodriguez Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index e7ab70234b54..742604ab5bd8 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -557,7 +557,6 @@ struct ath_softc { struct ath_hw *sc_ah; void __iomem *mem; int irq; - spinlock_t sc_resetlock; spinlock_t sc_serial_rw; spinlock_t sc_pm_lock; struct mutex mutex; diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c index 79241231c060..2e4724f1c662 100644 --- a/drivers/net/wireless/ath/ath9k/init.c +++ b/drivers/net/wireless/ath/ath9k/init.c @@ -574,7 +574,6 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid, common->debug_mask = ath9k_debug; spin_lock_init(&sc->wiphy_lock); - spin_lock_init(&sc->sc_resetlock); spin_lock_init(&sc->sc_serial_rw); spin_lock_init(&sc->sc_pm_lock); mutex_init(&sc->mutex); diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index bd93a9513f97..b4289da43617 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -233,19 +233,15 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, sc->sc_ah->curchan->channel, channel->center_freq, conf_is_ht40(conf)); - spin_lock_bh(&sc->sc_resetlock); - r = ath9k_hw_reset(ah, hchan, caldata, fastcc); if (r) { ath_print(common, ATH_DBG_FATAL, "Unable to reset channel (%u MHz), " "reset status %d\n", channel->center_freq, r); - spin_unlock_bh(&sc->sc_resetlock); spin_unlock_bh(&sc->rx.pcu_lock); goto ps_restore; } - spin_unlock_bh(&sc->sc_resetlock); if (ath_startrecv(sc) != 0) { ath_print(common, ATH_DBG_FATAL, @@ -848,7 +844,6 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) ah->curchan = ath_get_curchannel(sc, sc->hw); spin_lock_bh(&sc->rx.pcu_lock); - spin_lock_bh(&sc->sc_resetlock); r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false); if (r) { ath_print(common, ATH_DBG_FATAL, @@ -856,7 +851,6 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) "reset status %d\n", channel->center_freq, r); } - spin_unlock_bh(&sc->sc_resetlock); ath_update_txpow(sc); if (ath_startrecv(sc) != 0) { @@ -913,7 +907,6 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) if (!ah->curchan) ah->curchan = ath_get_curchannel(sc, hw); - spin_lock_bh(&sc->sc_resetlock); r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false); if (r) { ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL, @@ -921,7 +914,6 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) "reset status %d\n", channel->center_freq, r); } - spin_unlock_bh(&sc->sc_resetlock); ath9k_hw_phy_disable(ah); @@ -952,12 +944,10 @@ int ath_reset(struct ath_softc *sc, bool retry_tx) ath_stoprecv(sc); ath_flushrecv(sc); - spin_lock_bh(&sc->sc_resetlock); r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false); if (r) ath_print(common, ATH_DBG_FATAL, "Unable to reset hardware; reset status %d\n", r); - spin_unlock_bh(&sc->sc_resetlock); if (ath_startrecv(sc) != 0) ath_print(common, ATH_DBG_FATAL, @@ -1130,18 +1120,15 @@ static int ath9k_start(struct ieee80211_hw *hw) * and then setup of the interrupt mask. */ spin_lock_bh(&sc->rx.pcu_lock); - spin_lock_bh(&sc->sc_resetlock); r = ath9k_hw_reset(ah, init_channel, ah->caldata, false); if (r) { ath_print(common, ATH_DBG_FATAL, "Unable to reset hardware; reset status %d " "(freq %u MHz)\n", r, curchan->center_freq); - spin_unlock_bh(&sc->sc_resetlock); spin_unlock_bh(&sc->rx.pcu_lock); goto mutex_unlock; } - spin_unlock_bh(&sc->sc_resetlock); /* * This is needed only to setup initial state @@ -1365,14 +1352,17 @@ static void ath9k_stop(struct ieee80211_hw *hw) * before setting the invalid flag. */ ath9k_hw_set_interrupts(ah, 0); - spin_lock_bh(&sc->rx.pcu_lock); if (!(sc->sc_flags & SC_OP_INVALID)) { ath_drain_all_txq(sc, false); + spin_lock_bh(&sc->rx.pcu_lock); ath_stoprecv(sc); ath9k_hw_phy_disable(ah); - } else + spin_unlock_bh(&sc->rx.pcu_lock); + } else { + spin_lock_bh(&sc->rx.pcu_lock); sc->rx.rxlink = NULL; - spin_unlock_bh(&sc->rx.pcu_lock); + spin_unlock_bh(&sc->rx.pcu_lock); + } /* disable HAL and put h/w to sleep */ ath9k_hw_disable(ah); diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c index a5c489ca3494..c9cb0897f7ce 100644 --- a/drivers/net/wireless/ath/ath9k/xmit.c +++ b/drivers/net/wireless/ath/ath9k/xmit.c @@ -1160,13 +1160,13 @@ void ath_drain_all_txq(struct ath_softc *sc, bool retry_tx) ath_print(common, ATH_DBG_FATAL, "Failed to stop TX DMA. Resetting hardware!\n"); - spin_lock_bh(&sc->sc_resetlock); + spin_lock_bh(&sc->rx.pcu_lock); r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false); if (r) ath_print(common, ATH_DBG_FATAL, "Unable to reset hardware; reset status %d\n", r); - spin_unlock_bh(&sc->sc_resetlock); + spin_unlock_bh(&sc->rx.pcu_lock); } for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {