Return-path: Received: from nbd.name ([46.4.11.11]:38938 "EHLO nbd.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754655Ab1H2Sk4 (ORCPT ); Mon, 29 Aug 2011 14:40:56 -0400 From: Felix Fietkau To: linux-wireless@vger.kernel.org Cc: linville@tuxdriver.com, mcgrof@qca.qualcomm.com, rmanohar@qca.qualcomm.com Subject: [PATCH v7 3/4] ath9k: merge reset related functions Date: Mon, 29 Aug 2011 20:40:44 +0200 Message-Id: <1314643245-59142-3-git-send-email-nbd@openwrt.org> (sfid-20110829_204102_600641_DC158A7F) In-Reply-To: <1314643245-59142-2-git-send-email-nbd@openwrt.org> References: <1314643245-59142-1-git-send-email-nbd@openwrt.org> <1314643245-59142-2-git-send-email-nbd@openwrt.org> Sender: linux-wireless-owner@vger.kernel.org List-ID: reduces unnecessary code duplication. Also takes the sc_pcu_lock within ath_reset instead of callsites, which makes it possible to always cancel all queued work items before the reset, possibly fixing a few race conditions (work items vs reset) along with it. Signed-off-by: Felix Fietkau --- drivers/net/wireless/ath/ath9k/main.c | 299 ++++++++++++++------------------- 1 files changed, 126 insertions(+), 173 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index 76fcd4f..92158d9 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -212,83 +212,57 @@ static int ath_update_survey_stats(struct ath_softc *sc) return ret; } -/* - * Set/change channels. If the channel is really being changed, it's done - * by reseting the chip. To accomplish this we must first cleanup any pending - * DMA, then restart stuff. -*/ -static int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, - struct ath9k_channel *hchan) +static void __ath_cancel_work(struct ath_softc *sc) { - struct ath_hw *ah = sc->sc_ah; - struct ath_common *common = ath9k_hw_common(ah); - struct ieee80211_conf *conf = &common->hw->conf; - bool fastcc = true, stopped; - struct ieee80211_channel *channel = hw->conf.channel; - struct ath9k_hw_cal_data *caldata = NULL; - int r; - - if (sc->sc_flags & SC_OP_INVALID) - return -EIO; - - sc->hw_busy_count = 0; - - del_timer_sync(&common->ani.timer); cancel_work_sync(&sc->paprd_work); cancel_work_sync(&sc->hw_check_work); cancel_delayed_work_sync(&sc->tx_complete_work); cancel_delayed_work_sync(&sc->hw_pll_work); +} - ath9k_ps_wakeup(sc); +static void ath_cancel_work(struct ath_softc *sc) +{ + __ath_cancel_work(sc); + cancel_work_sync(&sc->hw_reset_work); +} - spin_lock_bh(&sc->sc_pcu_lock); +static bool ath_prepare_reset(struct ath_softc *sc, bool retry_tx, bool flush) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + bool ret; - /* - * This is only performed if the channel settings have - * actually changed. - * - * To switch channels clear any pending DMA operations; - * wait long enough for the RX fifo to drain, reset the - * hardware at the new frequency, and then re-enable - * the relevant bits of the h/w. - */ - ath9k_hw_disable_interrupts(ah); - stopped = ath_drain_all_txq(sc, false); + ieee80211_stop_queues(sc->hw); - if (!ath_stoprecv(sc)) - stopped = false; + sc->hw_busy_count = 0; + del_timer_sync(&common->ani.timer); - if (!ath9k_hw_check_alive(ah)) - stopped = false; + ath9k_hw_disable_interrupts(ah); - /* XXX: do not flush receive queue here. We don't want - * to flush data frames already in queue because of - * changing channel. */ + ret = ath_drain_all_txq(sc, retry_tx); - if (!stopped || !(sc->sc_flags & SC_OP_OFFCHANNEL)) - fastcc = false; + if (!ath_stoprecv(sc)) + ret = false; - if (!(sc->sc_flags & SC_OP_OFFCHANNEL)) - caldata = &sc->caldata; + if (!flush) { + if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) + ath_rx_tasklet(sc, 0, true); + ath_rx_tasklet(sc, 0, false); + } else { + ath_flushrecv(sc); + } - ath_dbg(common, ATH_DBG_CONFIG, - "(%u MHz) -> (%u MHz), conf_is_ht40: %d fastcc: %d\n", - sc->sc_ah->curchan->channel, - channel->center_freq, conf_is_ht40(conf), - fastcc); + return ret; +} - r = ath9k_hw_reset(ah, hchan, caldata, fastcc); - if (r) { - ath_err(common, - "Unable to reset channel (%u MHz), reset status %d\n", - channel->center_freq, r); - goto ps_restore; - } +static bool ath_complete_reset(struct ath_softc *sc, bool start) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); if (ath_startrecv(sc) != 0) { ath_err(common, "Unable to restart recv logic\n"); - r = -EIO; - goto ps_restore; + return false; } ath9k_cmn_update_txpow(ah, sc->curtxpow, @@ -296,21 +270,93 @@ static int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, ath9k_hw_set_interrupts(ah, ah->imask); ath9k_hw_enable_interrupts(ah); - if (!(sc->sc_flags & (SC_OP_OFFCHANNEL))) { + if (!(sc->sc_flags & (SC_OP_OFFCHANNEL)) && start) { if (sc->sc_flags & SC_OP_BEACONS) ath_set_beacon(sc); + ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0); ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work, HZ/2); if (!common->disable_ani) ath_start_ani(common); } - ps_restore: - ieee80211_wake_queues(hw); + ieee80211_wake_queues(sc->hw); + return true; +} + +static int ath_reset_internal(struct ath_softc *sc, struct ath9k_channel *hchan, + bool retry_tx) +{ + struct ath_hw *ah = sc->sc_ah; + struct ath_common *common = ath9k_hw_common(ah); + struct ath9k_hw_cal_data *caldata = NULL; + bool fastcc = true; + bool flush = false; + int r; + + __ath_cancel_work(sc); + + spin_lock_bh(&sc->sc_pcu_lock); + + if (!(sc->sc_flags & SC_OP_OFFCHANNEL)) { + fastcc = false; + caldata = &sc->caldata; + } + + if (!hchan) { + fastcc = false; + flush = true; + hchan = ah->curchan; + } + + if (fastcc && !ath9k_hw_check_alive(ah)) + fastcc = false; + + if (!ath_prepare_reset(sc, retry_tx, flush)) + fastcc = false; + + ath_dbg(common, ATH_DBG_CONFIG, + "Reset to %u MHz, HT40: %d fastcc: %d\n", + hchan->channel, !!(hchan->channelFlags & (CHANNEL_HT40MINUS | + CHANNEL_HT40PLUS)), + fastcc); + + r = ath9k_hw_reset(ah, hchan, caldata, fastcc); + if (r) { + ath_err(common, + "Unable to reset channel, reset status %d\n", r); + goto out; + } + + if (!ath_complete_reset(sc, true)) + r = -EIO; + +out: spin_unlock_bh(&sc->sc_pcu_lock); + return 0; +} + + +/* + * Set/change channels. If the channel is really being changed, it's done + * by reseting the chip. To accomplish this we must first cleanup any pending + * DMA, then restart stuff. +*/ +static int ath_set_channel(struct ath_softc *sc, struct ieee80211_hw *hw, + struct ath9k_channel *hchan) +{ + int r; + + if (sc->sc_flags & SC_OP_INVALID) + return -EIO; + + ath9k_ps_wakeup(sc); + + r = ath_reset_internal(sc, hchan, false); ath9k_ps_restore(sc); + return r; } @@ -823,28 +869,13 @@ static void ath_radio_enable(struct ath_softc *sc, struct ieee80211_hw *hw) channel->center_freq, r); } - ath9k_cmn_update_txpow(ah, sc->curtxpow, - sc->config.txpowlimit, &sc->curtxpow); - if (ath_startrecv(sc) != 0) { - ath_err(common, "Unable to restart recv logic\n"); - goto out; - } - if (sc->sc_flags & SC_OP_BEACONS) - ath_set_beacon(sc); /* restart beacons */ - - /* Re-Enable interrupts */ - ath9k_hw_set_interrupts(ah, ah->imask); - ath9k_hw_enable_interrupts(ah); + ath_complete_reset(sc, true); /* Enable LED */ ath9k_hw_cfg_output(ah, ah->led_pin, AR_GPIO_OUTPUT_MUX_AS_OUTPUT); ath9k_hw_set_gpio(ah, ah->led_pin, 0); - ieee80211_wake_queues(hw); - ieee80211_queue_delayed_work(hw, &sc->hw_pll_work, HZ/2); - -out: spin_unlock_bh(&sc->sc_pcu_lock); ath9k_ps_restore(sc); @@ -857,11 +888,10 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) int r; ath9k_ps_wakeup(sc); - cancel_delayed_work_sync(&sc->hw_pll_work); - spin_lock_bh(&sc->sc_pcu_lock); + ath_cancel_work(sc); - ieee80211_stop_queues(hw); + spin_lock_bh(&sc->sc_pcu_lock); /* * Keep the LED on when the radio is disabled @@ -872,13 +902,7 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) ath9k_hw_cfg_gpio_input(ah, ah->led_pin); } - /* Disable interrupts */ - ath9k_hw_disable_interrupts(ah); - - ath_drain_all_txq(sc, false); /* clear pending tx frames */ - - ath_stoprecv(sc); /* turn off frame recv */ - ath_flushrecv(sc); /* flush recv queue */ + ath_prepare_reset(sc, false, true); if (!ah->curchan) ah->curchan = ath9k_cmn_get_curchannel(hw, ah); @@ -900,48 +924,11 @@ void ath_radio_disable(struct ath_softc *sc, struct ieee80211_hw *hw) static int ath_reset(struct ath_softc *sc, bool retry_tx) { - struct ath_hw *ah = sc->sc_ah; - struct ath_common *common = ath9k_hw_common(ah); - struct ieee80211_hw *hw = sc->hw; int r; - sc->hw_busy_count = 0; - - /* Stop ANI */ - - del_timer_sync(&common->ani.timer); - ath9k_ps_wakeup(sc); - ieee80211_stop_queues(hw); - - ath9k_hw_disable_interrupts(ah); - ath_drain_all_txq(sc, retry_tx); - - ath_stoprecv(sc); - ath_flushrecv(sc); - - r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false); - if (r) - ath_err(common, - "Unable to reset hardware; reset status %d\n", r); - - if (ath_startrecv(sc) != 0) - ath_err(common, "Unable to start recv logic\n"); - - /* - * We may be doing a reset in response to a request - * that changes the channel so update any state that - * might change as a result. - */ - ath9k_cmn_update_txpow(ah, sc->curtxpow, - sc->config.txpowlimit, &sc->curtxpow); - - if ((sc->sc_flags & SC_OP_BEACONS) || !(sc->sc_flags & (SC_OP_OFFCHANNEL))) - ath_set_beacon(sc); /* restart beacons */ - - ath9k_hw_set_interrupts(ah, ah->imask); - ath9k_hw_enable_interrupts(ah); + r = ath_reset_internal(sc, NULL, retry_tx); if (retry_tx) { int i; @@ -954,12 +941,6 @@ static int ath_reset(struct ath_softc *sc, bool retry_tx) } } - ieee80211_wake_queues(hw); - - /* Start ANI */ - if (!common->disable_ani) - ath_start_ani(common); - ath9k_ps_restore(sc); return r; @@ -969,9 +950,7 @@ void ath_reset_work(struct work_struct *work) { struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work); - spin_lock_bh(&sc->sc_pcu_lock); ath_reset(sc, true); - spin_unlock_bh(&sc->sc_pcu_lock); } void ath_hw_check(struct work_struct *work) @@ -992,11 +971,8 @@ void ath_hw_check(struct work_struct *work) ath_dbg(common, ATH_DBG_RESET, "Possible baseband hang, " "busy=%d (try %d)\n", busy, sc->hw_busy_count + 1); if (busy >= 99) { - if (++sc->hw_busy_count >= 3) { - spin_lock_bh(&sc->sc_pcu_lock); - ath_reset(sc, true); - spin_unlock_bh(&sc->sc_pcu_lock); - } + if (++sc->hw_busy_count >= 3) + ieee80211_queue_work(sc->hw, &sc->hw_reset_work); } else if (busy >= 0) sc->hw_busy_count = 0; @@ -1016,9 +992,7 @@ static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum) /* Rx is hung for more than 500ms. Reset it */ ath_dbg(common, ATH_DBG_RESET, "Possible RX hang, resetting"); - spin_lock_bh(&sc->sc_pcu_lock); - ath_reset(sc, true); - spin_unlock_bh(&sc->sc_pcu_lock); + ieee80211_queue_work(sc->hw, &sc->hw_reset_work); count = 0; } } else @@ -1089,28 +1063,6 @@ static int ath9k_start(struct ieee80211_hw *hw) goto mutex_unlock; } - /* - * This is needed only to setup initial state - * but it's best done after a reset. - */ - ath9k_cmn_update_txpow(ah, sc->curtxpow, - sc->config.txpowlimit, &sc->curtxpow); - - /* - * Setup the hardware after reset: - * The receive engine is set going. - * Frame transmit is handled entirely - * in the frame output path; there's nothing to do - * here except setup the interrupt mask. - */ - if (ath_startrecv(sc) != 0) { - ath_err(common, "Unable to start recv logic\n"); - r = -EIO; - spin_unlock_bh(&sc->sc_pcu_lock); - goto mutex_unlock; - } - spin_unlock_bh(&sc->sc_pcu_lock); - /* Setup our intr mask. */ ah->imask = ATH9K_INT_TX | ATH9K_INT_RXEOL | ATH9K_INT_RXORN | ATH9K_INT_FATAL | @@ -1133,12 +1085,14 @@ static int ath9k_start(struct ieee80211_hw *hw) /* Disable BMISS interrupt when we're not associated */ ah->imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS); - ath9k_hw_set_interrupts(ah, ah->imask); - ath9k_hw_enable_interrupts(ah); - ieee80211_wake_queues(hw); + if (!ath_complete_reset(sc, false)) { + r = -EIO; + spin_unlock_bh(&sc->sc_pcu_lock); + goto mutex_unlock; + } - ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work, 0); + spin_unlock_bh(&sc->sc_pcu_lock); if ((ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE) && !ah->btcoex_hw.enabled) { @@ -1231,10 +1185,7 @@ static void ath9k_stop(struct ieee80211_hw *hw) mutex_lock(&sc->mutex); - cancel_delayed_work_sync(&sc->tx_complete_work); - cancel_delayed_work_sync(&sc->hw_pll_work); - cancel_work_sync(&sc->paprd_work); - cancel_work_sync(&sc->hw_check_work); + ath_cancel_work(sc); if (sc->sc_flags & SC_OP_INVALID) { ath_dbg(common, ATH_DBG_ANY, "Device not present\n"); @@ -2349,9 +2300,11 @@ static void ath9k_flush(struct ieee80211_hw *hw, bool drop) ath9k_ps_wakeup(sc); spin_lock_bh(&sc->sc_pcu_lock); drain_txq = ath_drain_all_txq(sc, false); + spin_unlock_bh(&sc->sc_pcu_lock); + if (!drain_txq) ath_reset(sc, false); - spin_unlock_bh(&sc->sc_pcu_lock); + ath9k_ps_restore(sc); ieee80211_wake_queues(hw); -- 1.7.3.2