target/linux/generic/backport-5.15/792-01-v6.0-net-phylink-disable-PCS-polling-over-major-configura.patch

   1 From bfac8c490d605bea03b1f1927582b6f396462164 Mon Sep 17 00:00:00 2001
   2 From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
   3 Date: Mon, 27 Jun 2022 12:44:43 +0100
   4 Subject: [PATCH] net: phylink: disable PCS polling over major configuration
   5
   6 While we are performing a major configuration, there is no point having
   7 the PCS polling timer running. Stop it before we begin preparing for
   8 the configuration change, and restart it only once we've successfully
   9 completed the change.
  10
  11 Reviewed-by: Andrew Lunn <andrew@lunn.ch>
  12 Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
  13 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  14 ---
  15  drivers/net/phy/phylink.c | 30 ++++++++++++++++++++----------
  16  1 file changed, 20 insertions(+), 10 deletions(-)
  17
  18 --- a/drivers/net/phy/phylink.c
  19 +++ b/drivers/net/phy/phylink.c
  20 @@ -756,6 +756,18 @@ static void phylink_resolve_flow(struct
  21         }
  22  }
  23
  24 +static void phylink_pcs_poll_stop(struct phylink *pl)
  25 +{
  26 +       if (pl->cfg_link_an_mode == MLO_AN_INBAND)
  27 +               del_timer(&pl->link_poll);
  28 +}
  29 +
  30 +static void phylink_pcs_poll_start(struct phylink *pl)
  31 +{
  32 +       if (pl->pcs->poll && pl->cfg_link_an_mode == MLO_AN_INBAND)
  33 +               mod_timer(&pl->link_poll, jiffies + HZ);
  34 +}
  35 +
  36  static void phylink_mac_config(struct phylink *pl,
  37                                const struct phylink_link_state *state)
  38  {
  39 @@ -787,6 +799,7 @@ static void phylink_major_config(struct
  40                                   const struct phylink_link_state *state)
  41  {
  42         struct phylink_pcs *pcs = NULL;
  43 +       bool pcs_changed = false;
  44         int err;
  45
  46         phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));
  47 @@ -799,8 +812,12 @@ static void phylink_major_config(struct
  48                                     pcs);
  49                         return;
  50                 }
  51 +
  52 +               pcs_changed = pcs && pl->pcs != pcs;
  53         }
  54
  55 +       phylink_pcs_poll_stop(pl);
  56 +
  57         if (pl->mac_ops->mac_prepare) {
  58                 err = pl->mac_ops->mac_prepare(pl->config, pl->cur_link_an_mode,
  59                                                state->interface);
  60 @@ -814,8 +831,10 @@ static void phylink_major_config(struct
  61         /* If we have a new PCS, switch to the new PCS after preparing the MAC
  62          * for the change.
  63          */
  64 -       if (pcs)
  65 -               phylink_set_pcs(pl, pcs);
  66 +       if (pcs_changed) {
  67 +               pl->pcs = pcs;
  68 +               pl->pcs_ops = pcs->ops;
  69 +       }
  70
  71         phylink_mac_config(pl, state);
  72
  73 @@ -841,6 +860,8 @@ static void phylink_major_config(struct
  74                         phylink_err(pl, "mac_finish failed: %pe\n",
  75                                     ERR_PTR(err));
  76         }
  77 +
  78 +       phylink_pcs_poll_start(pl);
  79  }
  80
  81  /*