target/linux/armsr/patches-6.1/701-v6.2-0009-net-dpaa2-eth-connect-to-MAC-before-requesting-the-e.patch

   1 From e0ea63162cb5f1ca7f844d6ef5fc4079448ee2d5 Mon Sep 17 00:00:00 2001
   2 From: Vladimir Oltean <vladimir.oltean@nxp.com>
   3 Date: Tue, 29 Nov 2022 16:12:18 +0200
   4 Subject: [PATCH 11/14] net: dpaa2-eth: connect to MAC before requesting the
   5  "endpoint changed" IRQ
   6
   7 dpaa2_eth_connect_mac() is called both from dpaa2_eth_probe() and from
   8 dpni_irq0_handler_thread().
   9
  10 It could happen that the DPNI gets connected to a DPMAC on the fsl-mc
  11 bus exactly during probe, as soon as the "endpoint change" interrupt is
  12 requested in dpaa2_eth_setup_irqs(). This will cause the
  13 dpni_irq0_handler_thread() to register a phylink instance for that DPMAC.
  14
  15 Then, the probing function will also try to register a phylink instance
  16 for the same DPMAC, operation which should fail (and this will fail the
  17 probing of the driver).
  18
  19 Reorder dpaa2_eth_setup_irqs() and dpaa2_eth_connect_mac(), such that
  20 dpni_irq0_handler_thread() never races with the DPMAC-related portion of
  21 the probing path.
  22
  23 Also reorder dpaa2_eth_disconnect_mac() to be in the mirror position of
  24 dpaa2_eth_connect_mac() in the teardown path.
  25
  26 Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
  27 Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
  28 Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com>
  29 Signed-off-by: Paolo Abeni <pabeni@redhat.com>
  30 ---
  31  .../net/ethernet/freescale/dpaa2/dpaa2-eth.c   | 18 +++++++++---------
  32  1 file changed, 9 insertions(+), 9 deletions(-)
  33
  34 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
  35 +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
  36 @@ -4710,6 +4710,10 @@ static int dpaa2_eth_probe(struct fsl_mc
  37         }
  38  #endif
  39
  40 +       err = dpaa2_eth_connect_mac(priv);
  41 +       if (err)
  42 +               goto err_connect_mac;
  43 +
  44         err = dpaa2_eth_setup_irqs(dpni_dev);
  45         if (err) {
  46                 netdev_warn(net_dev, "Failed to set link interrupt, fall back to polling\n");
  47 @@ -4722,10 +4726,6 @@ static int dpaa2_eth_probe(struct fsl_mc
  48                 priv->do_link_poll = true;
  49         }
  50
  51 -       err = dpaa2_eth_connect_mac(priv);
  52 -       if (err)
  53 -               goto err_connect_mac;
  54 -
  55         err = dpaa2_eth_dl_alloc(priv);
  56         if (err)
  57                 goto err_dl_register;
  58 @@ -4759,13 +4759,13 @@ err_dl_port_add:
  59  err_dl_trap_register:
  60         dpaa2_eth_dl_free(priv);
  61  err_dl_register:
  62 -       dpaa2_eth_disconnect_mac(priv);
  63 -err_connect_mac:
  64         if (priv->do_link_poll)
  65                 kthread_stop(priv->poll_thread);
  66         else
  67                 fsl_mc_free_irqs(dpni_dev);
  68  err_poll_thread:
  69 +       dpaa2_eth_disconnect_mac(priv);
  70 +err_connect_mac:
  71         dpaa2_eth_free_rings(priv);
  72  err_alloc_rings:
  73  err_csum:
  74 @@ -4813,9 +4813,6 @@ static int dpaa2_eth_remove(struct fsl_m
  75  #endif
  76
  77         unregister_netdev(net_dev);
  78 -       rtnl_lock();
  79 -       dpaa2_eth_disconnect_mac(priv);
  80 -       rtnl_unlock();
  81
  82         dpaa2_eth_dl_port_del(priv);
  83         dpaa2_eth_dl_traps_unregister(priv);
  84 @@ -4826,6 +4823,9 @@ static int dpaa2_eth_remove(struct fsl_m
  85         else
  86                 fsl_mc_free_irqs(ls_dev);
  87
  88 +       rtnl_lock();
  89 +       dpaa2_eth_disconnect_mac(priv);
  90 +       rtnl_unlock();
  91         dpaa2_eth_free_rings(priv);
  92         free_percpu(priv->fd);
  93         free_percpu(priv->sgt_cache);