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69 lines
2.0 KiB
Diff
69 lines
2.0 KiB
Diff
From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
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Date: Fri, 17 Oct 2014 07:40:16 +0530
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Subject: [PATCH] ath9k: Fix MCC flush timeout
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In MCC mode, the duration for a channel context
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is half the beacon interval and having a large
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flush timeout will adversely affect GO operation,
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since the default value of 200ms will overshoot
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the advertised NoA absence duration.
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The scheduler initiates a channel context switch
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only when the slot duration for the current
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context expires, so there is no possibility of
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having a fixed timeout for flush.
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Since the channel_switch_time is added to the
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absence duration when the GO sets up the NoA
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attribute, this is the maximum time that we
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have to flush the TX queues. The duration is very
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small, but we don't have a choice in MCC mode.
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Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
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---
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--- a/drivers/net/wireless/ath/ath9k/channel.c
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+++ b/drivers/net/wireless/ath/ath9k/channel.c
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@@ -199,6 +199,7 @@ static const char *chanctx_state_string(
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void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
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{
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struct ath_common *common = ath9k_hw_common(sc->sc_ah);
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+ struct ath_chanctx *ictx;
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struct ath_vif *avp;
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bool active = false;
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u8 n_active = 0;
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@@ -206,6 +207,8 @@ void ath_chanctx_check_active(struct ath
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if (!ctx)
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return;
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+ ictx = ctx;
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+
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list_for_each_entry(avp, &ctx->vifs, list) {
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struct ieee80211_vif *vif = avp->vif;
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@@ -228,12 +231,23 @@ void ath_chanctx_check_active(struct ath
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n_active++;
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}
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+ spin_lock_bh(&sc->chan_lock);
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+
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if (n_active <= 1) {
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+ ictx->flush_timeout = HZ / 5;
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clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
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+ spin_unlock_bh(&sc->chan_lock);
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return;
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}
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- if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
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+
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+ ictx->flush_timeout = usecs_to_jiffies(sc->sched.channel_switch_time);
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+
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+ if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) {
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+ spin_unlock_bh(&sc->chan_lock);
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return;
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+ }
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+
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+ spin_unlock_bh(&sc->chan_lock);
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if (ath9k_is_chanctx_enabled()) {
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ath_chanctx_event(sc, NULL,
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