[bug report] net/mxl5e: Add change profile method

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Hello Saeed Mahameed and Feras Daoud,

I'm not exactly sure if I should blame commit c4d7eb57687f: "net/mxl5e:
Add change profile method" fomr Mar 22, 2020 or commit 182570b26223
("net/mlx5e: Gather common netdev init/cleanup functionality in one
place") from Oct 2, 2018.

drivers/net/ethernet/mellanox/mlx5/core/en_main.c:5658 mlx5e_netdev_change_profile() warn: 'priv->htb.qos_sq_stats' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_main.c:5658 mlx5e_netdev_change_profile() warn: 'priv->scratchpad.cpumask' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_main.c:5789 mlx5e_probe() warn: 'priv->htb.qos_sq_stats' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_main.c:5789 mlx5e_probe() warn: 'priv->scratchpad.cpumask' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_main.c:5802 mlx5e_remove() warn: 'priv->htb.qos_sq_stats' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_main.c:5802 mlx5e_remove() warn: 'priv->scratchpad.cpumask' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:1317 mlx5e_vport_rep_unload() warn: 'priv->htb.qos_sq_stats' double freed
drivers/net/ethernet/mellanox/mlx5/core/en_rep.c:1317 mlx5e_vport_rep_unload() warn: 'priv->scratchpad.cpumask' double freed

drivers/net/ethernet/mellanox/mlx5/core/en_main.c
  5639  int mlx5e_netdev_change_profile(struct mlx5e_priv *priv,
  5640                                  const struct mlx5e_profile *new_profile, void *new_ppriv)
  5641  {
  5642          unsigned int new_max_nch = mlx5e_calc_max_nch(priv, new_profile);
  5643          const struct mlx5e_profile *orig_profile = priv->profile;
  5644          void *orig_ppriv = priv->ppriv;
  5645          int err, rollback_err;
  5646  
  5647          /* sanity */
  5648          if (new_max_nch != priv->max_nch) {
  5649                  netdev_warn(priv->netdev,
  5650                              "%s: Replacing profile with different max channles\n",
  5651                              __func__);
  5652                  return -EINVAL;
  5653          }
  5654  
  5655          /* cleanup old profile */
  5656          mlx5e_detach_netdev(priv);
  5657          priv->profile->cleanup(priv);

The problem is that mlx5i_pkey_cleanup() calls mlx5e_priv_cleanup().

  5658          mlx5e_priv_cleanup(priv);
                ^^^^^^^^^^^^^^^^^^^^^^^^
And then it gets called again here.

  5659  
  5660          err = mlx5e_netdev_attach_profile(priv, new_profile, new_ppriv);
  5661          if (err) { /* roll back to original profile */
  5662                  netdev_warn(priv->netdev, "%s: new profile init failed, %d\n",
  5663                              __func__, err);
  5664                  goto rollback;
  5665          }
  5666  
  5667          return 0;
  5668  
  5669  rollback:
  5670          rollback_err = mlx5e_netdev_attach_profile(priv, orig_profile, orig_ppriv);
  5671          if (rollback_err) {
  5672                  netdev_err(priv->netdev,
  5673                             "%s: failed to rollback to orig profile, %d\n",
  5674                             __func__, rollback_err);
  5675          }
  5676          return err;
  5677  }

regards,
dan carpenter



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