target/linux/generic/backport-5.15/729-07-v6.1-net-ethernet-mtk_eth_soc-remove-cpu_relax-in-mtk_pen.patch

   1 From: Lorenzo Bianconi <lorenzo@kernel.org>
   2 Date: Thu, 17 Nov 2022 00:58:46 +0100
   3 Subject: [PATCH] net: ethernet: mtk_eth_soc: remove cpu_relax in
   4  mtk_pending_work
   5
   6 Get rid of cpu_relax in mtk_pending_work routine since MTK_RESETTING is
   7 set only in mtk_pending_work() and it runs holding rtnl lock
   8
   9 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12
  13 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  14 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  15 @@ -3420,11 +3420,8 @@ static void mtk_pending_work(struct work
  16         rtnl_lock();
  17
  18         dev_dbg(eth->dev, "[%s][%d] reset\n", __func__, __LINE__);
  19 +       set_bit(MTK_RESETTING, &eth->state);
  20
  21 -       while (test_and_set_bit_lock(MTK_RESETTING, &eth->state))
  22 -               cpu_relax();
  23 -
  24 -       dev_dbg(eth->dev, "[%s][%d] mtk_stop starts\n", __func__, __LINE__);
  25         /* stop all devices to make sure that dma is properly shut down */
  26         for (i = 0; i < MTK_MAC_COUNT; i++) {
  27                 if (!eth->netdev[i])
  28 @@ -3458,7 +3455,7 @@ static void mtk_pending_work(struct work
  29
  30         dev_dbg(eth->dev, "[%s][%d] reset done\n", __func__, __LINE__);
  31
  32 -       clear_bit_unlock(MTK_RESETTING, &eth->state);
  33 +       clear_bit(MTK_RESETTING, &eth->state);
  34
  35         rtnl_unlock();
  36  }