From 347809fc2c99da5b89f1c014f3e5a0f85c04803c Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 2 Jul 2010 00:09:52 +0200 Subject: [PATCH] ath9k: fix false positives in the baseband hang check MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit ath9k_hw_check_alive() occasionally returns false, as the hardware is still processing data in a specific state. Fix this issue by repeating the test a few times with longer delay inbetween attempts. This gets rid of excessive hardware resets that appear frequently on some AR9132 based devices, but could also happen on AR9280. Signed-off-by: Felix Fietkau Reported-by: Björn Smedman Cc: stable@kernel.org Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ath9k.h | 2 ++ drivers/net/wireless/ath/ath9k/init.c | 1 + drivers/net/wireless/ath/ath9k/main.c | 27 ++++++++++++++++++++++++-- 3 files changed, 28 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index 72d5e52abb8f..6e486a508edb 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -428,6 +428,7 @@ int ath_beaconq_config(struct ath_softc *sc); #define ATH_PAPRD_TIMEOUT 100 /* msecs */ +void ath_hw_check(struct work_struct *work); void ath_paprd_calibrate(struct work_struct *work); void ath_ani_calibrate(unsigned long data); @@ -562,6 +563,7 @@ struct ath_softc { spinlock_t sc_pm_lock; struct mutex mutex; struct work_struct paprd_work; + struct work_struct hw_check_work; struct completion paprd_complete; u32 intrstatus; diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c index 8700e3dc53cf..fe730cb16ec2 100644 --- a/drivers/net/wireless/ath/ath9k/init.c +++ b/drivers/net/wireless/ath/ath9k/init.c @@ -718,6 +718,7 @@ int ath9k_init_device(u16 devid, struct ath_softc *sc, u16 subsysid, goto error_world; } + INIT_WORK(&sc->hw_check_work, ath_hw_check); INIT_WORK(&sc->paprd_work, ath_paprd_calibrate); INIT_WORK(&sc->chan_work, ath9k_wiphy_chan_work); INIT_DELAYED_WORK(&sc->wiphy_work, ath9k_wiphy_work); diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c index efbf53534ade..4c0831ff6e92 100644 --- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -515,6 +515,25 @@ static void ath_node_detach(struct ath_softc *sc, struct ieee80211_sta *sta) ath_tx_node_cleanup(sc, an); } +void ath_hw_check(struct work_struct *work) +{ + struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work); + int i; + + ath9k_ps_wakeup(sc); + + for (i = 0; i < 3; i++) { + if (ath9k_hw_check_alive(sc->sc_ah)) + goto out; + + msleep(1); + } + ath_reset(sc, false); + +out: + ath9k_ps_restore(sc); +} + void ath9k_tasklet(unsigned long data) { struct ath_softc *sc = (struct ath_softc *)data; @@ -526,13 +545,15 @@ void ath9k_tasklet(unsigned long data) ath9k_ps_wakeup(sc); - if ((status & ATH9K_INT_FATAL) || - !ath9k_hw_check_alive(ah)) { + if (status & ATH9K_INT_FATAL) { ath_reset(sc, false); ath9k_ps_restore(sc); return; } + if (!ath9k_hw_check_alive(ah)) + ieee80211_queue_work(sc->hw, &sc->hw_check_work); + if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) rxmask = (ATH9K_INT_RXHP | ATH9K_INT_RXLP | ATH9K_INT_RXEOL | ATH9K_INT_RXORN); @@ -1253,6 +1274,7 @@ static void ath9k_stop(struct ieee80211_hw *hw) cancel_delayed_work_sync(&sc->tx_complete_work); cancel_work_sync(&sc->paprd_work); + cancel_work_sync(&sc->hw_check_work); if (!sc->num_sec_wiphy) { cancel_delayed_work_sync(&sc->wiphy_work); @@ -1976,6 +1998,7 @@ static void ath9k_sw_scan_start(struct ieee80211_hw *hw) sc->sc_flags |= SC_OP_SCANNING; 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); mutex_unlock(&sc->mutex); } -- 2.30.2