Revert "net/mlx5: Accept devlink user input after driver initialization complete"

This reverts commit 9cc25e8529d567e08da98d11f092b21449763144 which is
commit 64ea2d0e7263b67d8efc93fa1baace041ed36d1e upstream.

This patch was shown to introduce a regression:

  # devlink dev param show pci/0000:24:00.0 name flow_steering_mode
  pci/0000:24:00.0:
    name flow_steering_mode type driver-specific
      values:

  (flow steering mode description is missing beneath "values:")

  # devlink dev param set pci/0000:24:00.0 name flow_steering_mode value smfs cmode runtime
  Segmentation fault (core dumped)

  and also with upstream iproute
  # ./iproute2/devlink/devlink dev param set pci/0000:24:00.0 name flow_steering_mode value smfs cmode runtime
  Configuration mode not supported

Note: Instead of reverting, we could instead also backport commit cf530217408e
("devlink: Notify users when objects are accessible"). However, that makes
changes to core devlink code that I'm not sure are suitable for a stable
backport.

Cc: Leon Romanovsky <leonro@nvidia.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 10 insertions, 6 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index d7576b6fa43b..7d56a927081d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -793,11 +793,14 @@ int mlx5_devlink_register(struct devlink *devlink)
 {
 	int err;
 
-	err = devlink_params_register(devlink, mlx5_devlink_params,
-				      ARRAY_SIZE(mlx5_devlink_params));
+	err = devlink_register(devlink);
 	if (err)
 		return err;
 
+	err = devlink_params_register(devlink, mlx5_devlink_params,
+				      ARRAY_SIZE(mlx5_devlink_params));
+	if (err)
+		goto params_reg_err;
 	mlx5_devlink_set_params_init_values(devlink);
 
 	err = mlx5_devlink_auxdev_params_register(devlink);
@@ -808,6 +811,7 @@ int mlx5_devlink_register(struct devlink *devlink)
 	if (err)
 		goto traps_reg_err;
 
+	devlink_params_publish(devlink);
 	return 0;
 
 traps_reg_err:
@@ -815,13 +819,17 @@ traps_reg_err:
 auxdev_reg_err:
 	devlink_params_unregister(devlink, mlx5_devlink_params,
 				  ARRAY_SIZE(mlx5_devlink_params));
+params_reg_err:
+	devlink_unregister(devlink);
 	return err;
 }
 
 void mlx5_devlink_unregister(struct devlink *devlink)
 {
+	devlink_params_unpublish(devlink);
 	mlx5_devlink_traps_unregister(devlink);
 	mlx5_devlink_auxdev_params_unregister(devlink);
 	devlink_params_unregister(devlink, mlx5_devlink_params,
 				  ARRAY_SIZE(mlx5_devlink_params));
+	devlink_unregister(devlink);
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 097ab6fe371c..4ed740994279 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1541,7 +1541,6 @@ static int probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		dev_err(&pdev->dev, "mlx5_crdump_enable failed with error code %d\n", err);
 
 	pci_save_state(pdev);
-	devlink_register(devlink);
 	if (!mlx5_core_is_mp_slave(dev))
 		devlink_reload_enable(devlink);
 	return 0;
@@ -1564,7 +1563,6 @@ static void remove_one(struct pci_dev *pdev)
 	struct devlink *devlink = priv_to_devlink(dev);
 
 	devlink_reload_disable(devlink);
-	devlink_unregister(devlink);
 	mlx5_crdump_disable(dev);
 	mlx5_drain_health_wq(dev);
 	mlx5_uninit_one(dev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c
index 3cf272fa2164..052f48068dc1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/driver.c
@@ -46,7 +46,6 @@ static int mlx5_sf_dev_probe(struct auxiliary_device *adev, const struct auxilia
 		mlx5_core_warn(mdev, "mlx5_init_one err=%d\n", err);
 		goto init_one_err;
 	}
-	devlink_register(devlink);
 	devlink_reload_enable(devlink);
 	return 0;
 
@@ -66,7 +65,6 @@ static void mlx5_sf_dev_remove(struct auxiliary_device *adev)
 
 	devlink = priv_to_devlink(sf_dev->mdev);
 	devlink_reload_disable(devlink);
-	devlink_unregister(devlink);
 	mlx5_uninit_one(sf_dev->mdev);
 	iounmap(sf_dev->mdev->iseg);
 	mlx5_mdev_uninit(sf_dev->mdev);