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 <greearb@xxxxxxxxxxxxxxx> Cc: Kyungwan Nam <kyungwan.nam@xxxxxxxxxxx> Cc: stable@xxxxxxxxxx Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx> Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx> --- drivers/net/wireless/ath/ath9k/ath9k.h | 1 - drivers/net/wireless/ath/ath9k/init.c | 1 - drivers/net/wireless/ath/ath9k/main.c | 22 ++++++---------------- 3 files changed, 6 insertions(+), 18 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index 94bd9bc..aaaa100 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -600,7 +600,6 @@ 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 91d9b2a..79a0659 100644 --- a/drivers/net/wireless/ath/ath9k/init.c +++ b/drivers/net/wireless/ath/ath9k/init.c @@ -580,7 +580,6 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid, spin_lock_init(&common->cc_lock); 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 cb0b2b9..e946ac3 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -267,19 +267,15 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, channel->center_freq, conf_is_ht40(conf), fastcc); - 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, @@ -890,7 +886,6 @@ 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, @@ -898,7 +893,6 @@ 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) { @@ -955,7 +949,6 @@ 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, @@ -963,7 +956,6 @@ 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); @@ -994,12 +986,10 @@ 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, @@ -1170,18 +1160,15 @@ 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 @@ -1403,14 +1390,17 @@ 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); -- 1.7.4.15.g7811d -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
