package/kernel/mac80211/patches/323-ath9k-Fix-HW-scan-abort.patch

   1 From: Sujith Manoharan <c_manoha@qca.qualcomm.com>
   2 Date: Fri, 17 Oct 2014 07:40:28 +0530
   3 Subject: [PATCH] ath9k: Fix HW scan abort
   4
   5 Instead of using ATH_CHANCTX_EVENT_ASSIGN to abort
   6 a HW scan when a new interface becomes active, use the
   7 mgd_prepare_tx() callback. This allows us to make
   8 sure that the GO's channel becomes operational by
   9 using flush_work().
  10
  11 Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
  12 ---
  13
  14 --- a/drivers/net/wireless/ath/ath9k/channel.c
  15 +++ b/drivers/net/wireless/ath/ath9k/channel.c
  16 @@ -743,22 +743,6 @@ void ath_chanctx_event(struct ath_softc
  17                 ieee80211_queue_work(sc->hw, &sc->chanctx_work);
  18                 break;
  19         case ATH_CHANCTX_EVENT_ASSIGN:
  20 -               /*
  21 -                * When adding a new channel context, check if a scan
  22 -                * is in progress and abort it since the addition of
  23 -                * a new channel context is usually followed by VIF
  24 -                * assignment, in which case we have to start multi-channel
  25 -                * operation.
  26 -                */
  27 -               if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
  28 -                       ath_dbg(common, CHAN_CTX,
  29 -                               "Aborting HW scan to add new context\n");
  30 -
  31 -                       spin_unlock_bh(&sc->chan_lock);
  32 -                       del_timer_sync(&sc->offchannel.timer);
  33 -                       ath_scan_complete(sc, true);
  34 -                       spin_lock_bh(&sc->chan_lock);
  35 -               }
  36                 break;
  37         case ATH_CHANCTX_EVENT_CHANGE:
  38                 break;
  39 --- a/drivers/net/wireless/ath/ath9k/main.c
  40 +++ b/drivers/net/wireless/ath/ath9k/main.c
  41 @@ -2365,7 +2365,6 @@ static int ath9k_add_chanctx(struct ieee
  42                         conf->def.chan->center_freq);
  43
  44                 ath_chanctx_set_channel(sc, ctx, &conf->def);
  45 -               ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_ASSIGN);
  46
  47                 mutex_unlock(&sc->mutex);
  48                 return 0;
  49 @@ -2496,6 +2495,19 @@ static void ath9k_mgd_prepare_tx(struct
  50         if (!changed)
  51                 goto out;
  52
  53 +       if (test_bit(ATH_OP_SCANNING, &common->op_flags)) {
  54 +               ath_dbg(common, CHAN_CTX,
  55 +                       "%s: Aborting HW scan\n", __func__);
  56 +
  57 +               mutex_unlock(&sc->mutex);
  58 +
  59 +               del_timer_sync(&sc->offchannel.timer);
  60 +               ath_scan_complete(sc, true);
  61 +               flush_work(&sc->chanctx_work);
  62 +
  63 +               mutex_lock(&sc->mutex);
  64 +       }
  65 +
  66         go_ctx = ath_is_go_chanctx_present(sc);
  67
  68         if (go_ctx) {