package/kernel/mac80211/patches/379-ath9k-fix-DMA-stop-sequence-for-AR9003.patch

   1 From: Felix Fietkau <nbd@openwrt.org>
   2 Date: Tue, 2 Jun 2015 10:35:46 +0200
   3 Subject: [PATCH] ath9k: fix DMA stop sequence for AR9003+
   4
   5 AR93xx and newer needs to stop rx before tx to avoid getting the DMA
   6 engine or MAC into a stuck state.
   7 This should reduce/fix the occurence of "Failed to stop Tx DMA" logspam.
   8
   9 Cc: stable@vger.kernel.org
  10 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  11 ---
  12
  13 --- a/drivers/net/wireless/ath/ath9k/main.c
  14 +++ b/drivers/net/wireless/ath/ath9k/main.c
  15 @@ -216,11 +216,13 @@ static bool ath_prepare_reset(struct ath
  16         ath_stop_ani(sc);
  17         ath9k_hw_disable_interrupts(ah);
  18
  19 -       if (!ath_drain_all_txq(sc))
  20 -               ret = false;
  21 -
  22 -       if (!ath_stoprecv(sc))
  23 -               ret = false;
  24 +       if (AR_SREV_9300_20_OR_LATER(ah)) {
  25 +               ret &= ath_stoprecv(sc);
  26 +               ret &= ath_drain_all_txq(sc);
  27 +       } else {
  28 +               ret &= ath_drain_all_txq(sc);
  29 +               ret &= ath_stoprecv(sc);
  30 +       }
  31
  32         return ret;
  33  }