From e2cba8d7590e76661e86f1f0987ef9f8c13c9a6d Mon Sep 17 00:00:00 2001 From: Sujith Manoharan Date: Thu, 2 Oct 2014 06:33:20 +0530 Subject: [PATCH] ath9k: Fix flushing in MCC mode When we are attempting to switch to a new channel context, the TX queues are flushed, but the mac80211 queues are not stopped and traffic can still come down to the driver. This patch fixes it by stopping the queues assigned to the current context/vif before trying to flush. Signed-off-by: Sujith Manoharan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/channel.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c index bf5ecd8..945c898 100644 --- a/drivers/net/wireless/ath/ath9k/channel.c +++ b/drivers/net/wireless/ath/ath9k/channel.c @@ -1044,9 +1044,11 @@ static void ath_offchannel_channel_change(struct ath_softc *sc) void ath_chanctx_set_next(struct ath_softc *sc, bool force) { struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_chanctx *old_ctx; struct timespec ts; bool measure_time = false; bool send_ps = false; + bool queues_stopped = false; spin_lock_bh(&sc->chan_lock); if (!sc->next_chan) { @@ -1076,6 +1078,10 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force) getrawmonotonic(&ts); measure_time = true; } + + ath9k_chanctx_stop_queues(sc, sc->cur_chan); + queues_stopped = true; + __ath9k_flush(sc->hw, ~0, true); if (ath_chanctx_send_ps_frame(sc, true)) @@ -1089,6 +1095,7 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force) sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah); } } + old_ctx = sc->cur_chan; sc->cur_chan = sc->next_chan; sc->cur_chan->stopped = false; sc->next_chan = NULL; @@ -1111,7 +1118,16 @@ void ath_chanctx_set_next(struct ath_softc *sc, bool force) if (measure_time) sc->sched.channel_switch_time = ath9k_hw_get_tsf_offset(&ts, NULL); + /* + * A reset will ensure that all queues are woken up, + * so there is no need to awaken them again. + */ + goto out; } + + if (queues_stopped) + ath9k_chanctx_wake_queues(sc, old_ctx); +out: if (send_ps) ath_chanctx_send_ps_frame(sc, false); -- 2.7.4