ath9k: Fix locking issue during tx completion
The received tx status of aggregated frame without BlockAck may cause deaf state in AR5416 cards. So the driver does a reset to recover. When this happens, we release the pcu_lock before doing a reset as ath_rest acquires pcu_lock. This is ugly and also not atomic. Fixing this addresses the TX DMA failure also. ath_tx_complete_aggr can be called from different paths which takes different variants of spin_lock. This patch also addresses the following warning. WARNING: at kernel/timer.c:1011 del_timer_sync+0x4e/0x50() Call Trace: <IRQ> [<ffffffff8104be3a>] warn_slowpath_common+0x7a/0xb0 [<ffffffff8104be85>] warn_slowpath_null+0x15/0x20 [<ffffffff8105915e>] del_timer_sync+0x4e/0x50 [<ffffffffa03726be>] ath_reset+0x3e/0x210 [ath9k] [<ffffffff8135cdaf>] ? _raw_spin_unlock_bh+0x1f/0x30 [<ffffffffa037760a>] ath_tx_complete_aggr.isra.26+0x54a/0xa40 [ath9k] Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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428bc8c396
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f6b4e4d476
3 changed files with 14 additions and 8 deletions
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@ -385,7 +385,9 @@ void ath_beacon_tasklet(unsigned long data)
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ath_dbg(common, ATH_DBG_BSTUCK,
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"beacon is officially stuck\n");
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sc->sc_flags |= SC_OP_TSF_RESET;
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spin_lock(&sc->sc_pcu_lock);
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ath_reset(sc, true);
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spin_unlock(&sc->sc_pcu_lock);
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}
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return;
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@ -617,8 +617,11 @@ void ath_hw_check(struct work_struct *work)
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ath_dbg(common, ATH_DBG_RESET, "Possible baseband hang, "
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"busy=%d (try %d)\n", busy, sc->hw_busy_count + 1);
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if (busy >= 99) {
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if (++sc->hw_busy_count >= 3)
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if (++sc->hw_busy_count >= 3) {
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spin_lock_bh(&sc->sc_pcu_lock);
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ath_reset(sc, true);
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spin_unlock_bh(&sc->sc_pcu_lock);
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}
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} else if (busy >= 0)
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sc->hw_busy_count = 0;
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@ -637,7 +640,9 @@ static void ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
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/* Rx is hung for more than 500ms. Reset it */
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ath_dbg(common, ATH_DBG_RESET,
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"Possible RX hang, resetting");
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spin_lock_bh(&sc->sc_pcu_lock);
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ath_reset(sc, true);
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spin_unlock_bh(&sc->sc_pcu_lock);
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count = 0;
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}
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} else
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@ -674,7 +679,9 @@ void ath9k_tasklet(unsigned long data)
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if ((status & ATH9K_INT_FATAL) ||
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(status & ATH9K_INT_BB_WATCHDOG)) {
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spin_lock(&sc->sc_pcu_lock);
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ath_reset(sc, true);
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spin_unlock(&sc->sc_pcu_lock);
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return;
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}
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@ -980,7 +987,6 @@ int ath_reset(struct ath_softc *sc, bool retry_tx)
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del_timer_sync(&common->ani.timer);
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ath9k_ps_wakeup(sc);
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spin_lock_bh(&sc->sc_pcu_lock);
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ieee80211_stop_queues(hw);
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@ -1023,7 +1029,6 @@ int ath_reset(struct ath_softc *sc, bool retry_tx)
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}
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ieee80211_wake_queues(hw);
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spin_unlock_bh(&sc->sc_pcu_lock);
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/* Start ANI */
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if (!common->disable_ani)
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@ -2326,9 +2331,9 @@ static void ath9k_flush(struct ieee80211_hw *hw, bool drop)
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ath9k_ps_wakeup(sc);
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spin_lock_bh(&sc->sc_pcu_lock);
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drain_txq = ath_drain_all_txq(sc, false);
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spin_unlock_bh(&sc->sc_pcu_lock);
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if (!drain_txq)
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ath_reset(sc, false);
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spin_unlock_bh(&sc->sc_pcu_lock);
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ath9k_ps_restore(sc);
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ieee80211_wake_queues(hw);
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@ -565,11 +565,8 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
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rcu_read_unlock();
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if (needreset) {
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spin_unlock_bh(&sc->sc_pcu_lock);
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if (needreset)
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ath_reset(sc, false);
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spin_lock_bh(&sc->sc_pcu_lock);
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}
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}
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static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
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@ -2169,7 +2166,9 @@ static void ath_tx_complete_poll_work(struct work_struct *work)
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if (needreset) {
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ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_RESET,
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"tx hung, resetting the chip\n");
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spin_lock_bh(&sc->sc_pcu_lock);
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ath_reset(sc, true);
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spin_unlock_bh(&sc->sc_pcu_lock);
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}
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ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
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