From: Shay Drory <shayd@nvidia.com>
Date: Wed, 14 Dec 2022 22:16:23 +0200
Subject: net/mlx5: Serialize module cleanup with reload and remove
Patch-mainline: v6.2-rc8
Git-commit: 8f0d1451ecf7b3bd5a06ffc866c753d0f3ab4683
References: jsc#PED-1549

Currently, remove and reload flows can run in parallel to module cleanup.
This design is error prone. For example: aux_drivers callbacks are called
from both cleanup and remove flows with different lockings, which can
cause a deadlock[1].
Hence, serialize module cleanup with reload and remove.

[1]
       cleanup                        remove
       -------                        ------
   auxiliary_driver_unregister();
                                     devl_lock()
                                      auxiliary_device_delete(mlx5e_aux)
    device_lock(mlx5e_aux)
     devl_lock()
                                       device_lock(mlx5e_aux)

Fixes: 912cebf420c2 ("net/mlx5e: Connect ethernet part to auxiliary bus")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/main.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -2094,7 +2094,7 @@ static int __init mlx5_init(void)
 	mlx5_core_verify_params();
 	mlx5_register_debugfs();
 
-	err = pci_register_driver(&mlx5_core_driver);
+	err = mlx5e_init();
 	if (err)
 		goto err_debug;
 
@@ -2102,16 +2102,16 @@ static int __init mlx5_init(void)
 	if (err)
 		goto err_sf;
 
-	err = mlx5e_init();
+	err = pci_register_driver(&mlx5_core_driver);
 	if (err)
-		goto err_en;
+		goto err_pci;
 
 	return 0;
 
-err_en:
+err_pci:
 	mlx5_sf_driver_unregister();
 err_sf:
-	pci_unregister_driver(&mlx5_core_driver);
+	mlx5e_cleanup();
 err_debug:
 	mlx5_unregister_debugfs();
 	return err;
@@ -2119,9 +2119,9 @@ err_debug:
 
 static void __exit mlx5_cleanup(void)
 {
-	mlx5e_cleanup();
-	mlx5_sf_driver_unregister();
 	pci_unregister_driver(&mlx5_core_driver);
+	mlx5_sf_driver_unregister();
+	mlx5e_cleanup();
 	mlx5_unregister_debugfs();
 }