[PATCH v5 net 6/7] i40e: do not expose netdev too early

[Maciej Fijalkowski <maciej.fijalkowski@intel.com>]

i40e_vsi_setup() registers the netdev before rings and q_vectors are fully
allocated and mapped. Once register_netdev() returns, userspace can reach
netdev callbacks such as ndo_open(), so the VSI backing state must already
be ready.

Move register_netdev() to the end of the setup path, after ring/q_vector
allocation, ring mapping and RSS configuration. Keep freeing an allocated
but not registered netdev on the error path.

Fixes: 41c445ff0f48 ("i40e: main driver core")
Reported-by: Sashiko AI Review <sashiko-bot@kernel.org>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 29 ++++++++++++---------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index fcdd13af08ea..a9ec53cfd905 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -14454,15 +14454,6 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
 				goto err_netdev;
 			SET_NETDEV_DEVLINK_PORT(vsi->netdev, &pf->devlink_port);
 		}
-		ret = register_netdev(vsi->netdev);
-		if (ret)
-			goto err_dl_port;
-		vsi->netdev_registered = true;
-		netif_carrier_off(vsi->netdev);
-#ifdef CONFIG_I40E_DCB
-		/* Setup DCB netlink interface */
-		i40e_dcbnl_setup(vsi);
-#endif /* CONFIG_I40E_DCB */
 		fallthrough;
 	case I40E_VSI_FDIR:
 		/* set up vectors and rings if needed */
@@ -14490,6 +14481,19 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
 		if (ret)
 			goto err_config;
 	}
+
+	if (vsi->netdev) {
+		ret = register_netdev(vsi->netdev);
+		if (ret)
+			goto err_config;
+		vsi->netdev_registered = true;
+		netif_carrier_off(vsi->netdev);
+#ifdef CONFIG_I40E_DCB
+		/* Setup DCB netlink interface */
+		i40e_dcbnl_setup(vsi);
+#endif /* CONFIG_I40E_DCB */
+	}
+
 	return vsi;
 
 err_config:
@@ -14500,13 +14504,14 @@ struct i40e_vsi *i40e_vsi_setup(struct i40e_pf *pf, u8 type,
 	if (vsi->netdev_registered) {
 		vsi->netdev_registered = false;
 		unregister_netdev(vsi->netdev);
-		free_netdev(vsi->netdev);
-		vsi->netdev = NULL;
 	}
-err_dl_port:
 	if (vsi->type == I40E_VSI_MAIN)
 		i40e_devlink_destroy_port(pf);
 err_netdev:
+	if (vsi->netdev) {
+		free_netdev(vsi->netdev);
+		vsi->netdev = NULL;
+	}
 	i40e_aq_delete_element(&pf->hw, vsi->seid, NULL);
 err_vsi:
 	i40e_vsi_clear(vsi);
-- 
2.43.0