target/linux/mvebu/patches-4.9/437-phylink-ensure-link-drops-are-reported.patch

   1 From: Russell King <rmk+kernel@armlinux.org.uk>
   2 Date: Mon, 19 Dec 2016 12:17:57 +0000
   3 Subject: [PATCH] phylink: ensure link drops are reported
   4
   5 When the MAC reports a link failure, it can be momentary.  Ensure
   6 that the event is reported by latching the loss of link, so that the
   7 worker reports link down.
   8
   9 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  10 ---
  11
  12 --- a/drivers/net/phy/phylink.c
  13 +++ b/drivers/net/phy/phylink.c
  14 @@ -60,6 +60,8 @@ struct phylink {
  15         struct phylink_link_state phy_state;
  16         struct work_struct resolve;
  17
  18 +       bool mac_link_dropped;
  19 +
  20         const struct phylink_module_ops *module_ops;
  21         void *module_data;
  22  };
  23 @@ -340,6 +342,9 @@ static void phylink_resolve(struct work_
  24
  25         mutex_lock(&pl->state_mutex);
  26         if (pl->phylink_disable_state) {
  27 +               pl->mac_link_dropped = false;
  28 +               link_state.link = false;
  29 +       } else if (pl->mac_link_dropped) {
  30                 link_state.link = false;
  31         } else {
  32                 switch (pl->link_an_mode) {
  33 @@ -405,6 +410,10 @@ static void phylink_resolve(struct work_
  34                                     phylink_pause_to_str(link_state.pause));
  35                 }
  36         }
  37 +       if (!link_state.link && pl->mac_link_dropped) {
  38 +               pl->mac_link_dropped = false;
  39 +               queue_work(system_power_efficient_wq, &pl->resolve);
  40 +       }
  41         mutex_unlock(&pl->state_mutex);
  42  }
  43
  44 @@ -641,6 +650,8 @@ EXPORT_SYMBOL_GPL(phylink_disconnect_phy
  45
  46  void phylink_mac_change(struct phylink *pl, bool up)
  47  {
  48 +       if (!up)
  49 +               pl->mac_link_dropped = true;
  50         phylink_run_resolve(pl);
  51         netdev_dbg(pl->netdev, "mac link %s\n", up ? "up" : "down");
  52  }