commit 6a6733f256f18cbcf4875e13f59eedb593b755a8 upstream This helps align resets / RX enable & disable / TX stop / start. Locking around the PCU is important to ensure the hardware doesn't get stale data when working with DMA'able data.
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 <[email protected]> Cc: Kyungwan Nam <[email protected]> Cc: [email protected] Signed-off-by: Luis R. Rodriguez <[email protected]> Signed-off-by: John W. Linville <[email protected]> --- drivers/net/wireless/ath/ath9k/main.c | 52 ++++++++++++++++---------------- 1 files changed, 26 insertions(+), 26 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 5e3e979..5a5f59f 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -234,6 +234,8 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, ath9k_ps_wakeup(sc); + spin_lock_bh(&sc->sc_pcu_lock); + /* * This is only performed if the channel settings have * actually changed. @@ -246,8 +248,6 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, ath9k_hw_set_interrupts(ah, 0); stopped = ath_drain_all_txq(sc, false); - spin_lock_bh(&sc->sc_pcu_lock); - if (!ath_stoprecv(sc)) stopped = false; @@ -273,7 +273,6 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, "Unable to reset channel (%u MHz), " "reset status %d\n", channel->center_freq, r); - spin_unlock_bh(&sc->sc_pcu_lock); goto ps_restore; } @@ -281,12 +280,9 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, ath_print(common, ATH_DBG_FATAL, "Unable to restart recv logic\n"); r = -EIO; - spin_unlock_bh(&sc->sc_pcu_lock); goto ps_restore; } - spin_unlock_bh(&sc->sc_pcu_lock); - ath_update_txpow(sc); ath9k_hw_set_interrupts(ah, ah->imask); @@ -298,6 +294,8 @@ int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, } ps_restore: + spin_unlock_bh(&sc->sc_pcu_lock); + ath9k_ps_restore(sc); return r; } @@ -612,6 +610,8 @@ void ath9k_tasklet(unsigned long data) return; } + spin_lock_bh(&sc->sc_pcu_lock); + if (!ath9k_hw_check_alive(ah)) ieee80211_queue_work(sc->hw, &sc->hw_check_work); @@ -622,15 +622,12 @@ void ath9k_tasklet(unsigned long data) rxmask = (ATH9K_INT_RX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN); if (status & rxmask) { - spin_lock_bh(&sc->sc_pcu_lock); - /* Check for high priority Rx first */ if ((ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) && (status & ATH9K_INT_RXHP)) ath_rx_tasklet(sc, 0, true); ath_rx_tasklet(sc, 0, false); - spin_unlock_bh(&sc->sc_pcu_lock); } if (status & ATH9K_INT_TX) { @@ -656,6 +653,8 @@ void ath9k_tasklet(unsigned long data) /* re-enable hardware interrupt */ ath9k_hw_set_interrupts(ah, ah->imask); + + spin_unlock_bh(&sc->sc_pcu_lock); ath9k_ps_restore(sc); } @@ -880,12 +879,13 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) int r; ath9k_ps_wakeup(sc); + spin_lock_bh(&sc->sc_pcu_lock); + ath9k_hw_configpcipowersave(ah, 0, 0); if (!ah->curchan) ah->curchan = ath_get_curchannel(sc, sc->hw); - spin_lock_bh(&sc->sc_pcu_lock); r = ath9k_hw_reset(ah, ah->curchan, ah->caldata, false); if (r) { ath_print(common, ATH_DBG_FATAL, @@ -901,8 +901,6 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) spin_unlock_bh(&sc->sc_pcu_lock); return; } - spin_unlock_bh(&sc->sc_pcu_lock); - if (sc->sc_flags & SC_OP_BEACONS) ath_beacon_config(sc, NULL); /* restart beacons */ @@ -915,6 +913,8 @@ void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) ath9k_hw_set_gpio(ah, ah->led_pin, 0); ieee80211_wake_queues(hw); + spin_unlock_bh(&sc->sc_pcu_lock); + ath9k_ps_restore(sc); } @@ -925,6 +925,8 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) int r; ath9k_ps_wakeup(sc); + spin_lock_bh(&sc->sc_pcu_lock); + ieee80211_stop_queues(hw); /* @@ -941,8 +943,6 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) ath_drain_all_txq(sc, false); /* clear pending tx frames */ - spin_lock_bh(&sc->sc_pcu_lock); - ath_stoprecv(sc); /* turn off frame recv */ ath_flushrecv(sc); /* flush recv queue */ @@ -959,10 +959,11 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) ath9k_hw_phy_disable(ah); - spin_unlock_bh(&sc->sc_pcu_lock); - ath9k_hw_configpcipowersave(ah, 1, 1); + + spin_unlock_bh(&sc->sc_pcu_lock); ath9k_ps_restore(sc); + ath9k_setpower(sc, ATH9K_PM_FULL_SLEEP); } @@ -976,13 +977,13 @@ int ath_reset(struct ath_softc *sc, bool retry_tx) /* Stop ANI */ del_timer_sync(&common->ani.timer); + spin_lock_bh(&sc->sc_pcu_lock); + ieee80211_stop_queues(hw); ath9k_hw_set_interrupts(ah, 0); ath_drain_all_txq(sc, retry_tx); - spin_lock_bh(&sc->sc_pcu_lock); - ath_stoprecv(sc); ath_flushrecv(sc); @@ -995,8 +996,6 @@ int ath_reset(struct ath_softc *sc, bool retry_tx) ath_print(common, ATH_DBG_FATAL, "Unable to start recv logic\n"); - spin_unlock_bh(&sc->sc_pcu_lock); - /* * We may be doing a reset in response to a request * that changes the channel so update any state that @@ -1021,6 +1020,7 @@ int ath_reset(struct ath_softc *sc, bool retry_tx) } ieee80211_wake_queues(hw); + spin_unlock_bh(&sc->sc_pcu_lock); /* Start ANI */ ath_start_ani(common); @@ -1386,25 +1386,25 @@ static void ath9k_stop(struct ieee80211_hw *hw) ath9k_btcoex_timer_pause(sc); } + spin_lock_bh(&sc->sc_pcu_lock); + /* make sure h/w will not generate any interrupt * before setting the invalid flag. */ ath9k_hw_set_interrupts(ah, 0); if (!(sc->sc_flags & SC_OP_INVALID)) { ath_drain_all_txq(sc, false); - spin_lock_bh(&sc->sc_pcu_lock); ath_stoprecv(sc); ath9k_hw_phy_disable(ah); - spin_unlock_bh(&sc->sc_pcu_lock); - } else { - spin_lock_bh(&sc->sc_pcu_lock); + } else sc->rx.rxlink = NULL; - spin_unlock_bh(&sc->sc_pcu_lock); - } /* disable HAL and put h/w to sleep */ ath9k_hw_disable(ah); ath9k_hw_configpcipowersave(ah, 1, 1); + + spin_unlock_bh(&sc->sc_pcu_lock); + ath9k_ps_restore(sc); sc->ps_idle = true; -- 1.7.4.15.g7811d _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
