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From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Date: Fri, 17 Oct 2014 07:40:28 +0530
Subject: [PATCH] ath9k: Fix HW scan abort
Instead of using ATH_CHANCTX_EVENT_ASSIGN to abort
a HW scan when a new interface becomes active, use the
mgd_prepare_tx() callback. This allows us to make
sure that the GO's channel becomes operational by
using flush_work().
Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
---
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -743,22 +743,6 @@ void ath_chanctx_event(struct ath_softc
ieee80211_queue_work(sc->hw, &sc->chanctx_work);
break;
case ATH_CHANCTX_EVENT_ASSIGN:
- /*
- * When adding a new channel context, check if a scan
- * is in progress and abort it since the addition of
- * a new channel context is usually followed by VIF
- * assignment, in which case we have to start multi-channel
- * operation.
- */
- if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
- ath_dbg(common, CHAN_CTX,
- "Aborting HW scan to add new context\n");
-
- spin_unlock_bh(&sc->chan_lock);
- del_timer_sync(&sc->offchannel.timer);
- ath_scan_complete(sc, true);
- spin_lock_bh(&sc->chan_lock);
- }
break;
case ATH_CHANCTX_EVENT_CHANGE:
break;
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -2365,7 +2365,6 @@ static int ath9k_add_chanctx(struct ieee
conf->def.chan->center_freq);
ath_chanctx_set_channel(sc, ctx, &conf->def);
- ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_ASSIGN);
mutex_unlock(&sc->mutex);
return 0;
@@ -2496,6 +2495,19 @@ static void ath9k_mgd_prepare_tx(struct
if (!changed)
goto out;
+ if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
+ ath_dbg(common, CHAN_CTX,
+ "%s: Aborting HW scan\n", __func__);
+
+ mutex_unlock(&sc->mutex);
+
+ del_timer_sync(&sc->offchannel.timer);
+ ath_scan_complete(sc, true);
+ flush_work(&sc->chanctx_work);
+
+ mutex_lock(&sc->mutex);
+ }
+
go_ctx = ath_is_go_chanctx_present(sc);
if (go_ctx) {
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