target/linux/mediatek/patches-4.4/0091-net-next-mediatek-only-wake-the-queue-if-it-is-stopp.patch

   1 From 1473b4cce85760c0202a08e6a48ec51867dc1bf7 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <john@phrozen.org>
   3 Date: Tue, 3 May 2016 04:01:38 +0200
   4 Subject: [PATCH 091/102] net-next: mediatek: only wake the queue if it is
   5  stopped
   6
   7 The current code unconditionally wakes up the queue at the end of each
   8 tx_poll action. Change the code to only wake up the queues if any of
   9 them have actually been stopped before.
  10
  11 Signed-off-by: John Crispin <john@phrozen.org>
  12 ---
  13  drivers/net/ethernet/mediatek/mtk_eth_soc.c |   17 ++++++++++++++++-
  14  1 file changed, 16 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  17 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  18 @@ -716,6 +716,20 @@ static inline int mtk_cal_txd_req(struct
  19         return nfrags;
  20  }
  21
  22 +static int mtk_queue_stopped(struct mtk_eth *eth)
  23 +{
  24 +       int i;
  25 +
  26 +       for (i = 0; i < MTK_MAC_COUNT; i++) {
  27 +               if (!eth->netdev[i])
  28 +                       continue;
  29 +               if (netif_queue_stopped(eth->netdev[i]))
  30 +                       return 1;
  31 +       }
  32 +
  33 +       return 0;
  34 +}
  35 +
  36  static void mtk_wake_queue(struct mtk_eth *eth)
  37  {
  38         int i;
  39 @@ -960,7 +974,8 @@ static int mtk_poll_tx(struct mtk_eth *e
  40         if (!total)
  41                 return 0;
  42
  43 -       if (atomic_read(&ring->free_count) > ring->thresh)
  44 +       if (mtk_queue_stopped(eth) &&
  45 +           (atomic_read(&ring->free_count) > ring->thresh))
  46                 mtk_wake_queue(eth);
  47
  48         return total;