target/linux/generic/backport-5.15/765-v5.17-01-net-next-net-dsa-reorder-PHY-initialization-with-MTU-setup-in.patch

   1 From 904e112ad431492b34f235f59738e8312802bbf9 Mon Sep 17 00:00:00 2001
   2 From: Vladimir Oltean <vladimir.oltean@nxp.com>
   3 Date: Thu, 6 Jan 2022 01:11:12 +0200
   4 Subject: [PATCH 1/6] net: dsa: reorder PHY initialization with MTU setup in
   5  slave.c
   6
   7 In dsa_slave_create() there are 2 sections that take rtnl_lock():
   8 MTU change and netdev registration. They are separated by PHY
   9 initialization.
  10
  11 There isn't any strict ordering requirement except for the fact that
  12 netdev registration should be last. Therefore, we can perform the MTU
  13 change a bit later, after the PHY setup. A future change will then be
  14 able to merge the two rtnl_lock sections into one.
  15
  16 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
  17 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
  18 Signed-off-by: David S. Miller <davem@davemloft.net>
  19 ---
  20  net/dsa/slave.c | 14 +++++++-------
  21  1 file changed, 7 insertions(+), 7 deletions(-)
  22
  23 --- a/net/dsa/slave.c
  24 +++ b/net/dsa/slave.c
  25 @@ -1977,13 +1977,6 @@ int dsa_slave_create(struct dsa_port *po
  26         port->slave = slave_dev;
  27         dsa_slave_setup_tagger(slave_dev);
  28
  29 -       rtnl_lock();
  30 -       ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
  31 -       rtnl_unlock();
  32 -       if (ret && ret != -EOPNOTSUPP)
  33 -               dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
  34 -                        ret, ETH_DATA_LEN, port->index);
  35 -
  36         netif_carrier_off(slave_dev);
  37
  38         ret = dsa_slave_phy_setup(slave_dev);
  39 @@ -1995,6 +1988,13 @@ int dsa_slave_create(struct dsa_port *po
  40         }
  41
  42         rtnl_lock();
  43 +       ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
  44 +       rtnl_unlock();
  45 +       if (ret && ret != -EOPNOTSUPP)
  46 +               dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
  47 +                        ret, ETH_DATA_LEN, port->index);
  48 +
  49 +       rtnl_lock();
  50
  51         ret = register_netdevice(slave_dev);
  52         if (ret) {