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ath9k: Fix drain txq failure in flush

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While draining the txq in flush, the buffers can be
added into the tx queue by tx_tasklet which leads to
unneccesary chip reset.

This issue was originially found with AR9382 and
running heavy uplink udp traffic with higher bandwidth
and doing frequent bgscan.

Cc: stable@kernel.org
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rajkumar Manoharan 2011-04-28 15:31:57 +05:30 committed by John W. Linville
parent 890641b251
commit 2f6fc351e6
1 changed files with 5 additions and 1 deletions
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6
drivers/net/wireless/ath/ath9k/main.c
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@ -2261,6 +2261,7 @@ static void ath9k_flush(struct ieee80211_hw *hw, bool drop)
struct ath_softc *sc = hw->priv;
int timeout = 200; /* ms */
int i, j;
bool drain_txq;
mutex_lock(&sc->mutex);
cancel_delayed_work_sync(&sc->tx_complete_work);
@ -2286,7 +2287,10 @@ static void ath9k_flush(struct ieee80211_hw *hw, bool drop)
}
ath9k_ps_wakeup(sc);
if (!ath_drain_all_txq(sc, false))
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);
ath9k_ps_restore(sc);
ieee80211_wake_queues(hw);