netdev - [net 5/5] net/mlx5: Clear LAG notifier pointer after unregister

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Message-Id: <20200305231739.227618-6-saeedm@mellanox.com>
Date:   Thu,  5 Mar 2020 15:17:39 -0800
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eli Cohen <eli@...lanox.com>,
        Vlad Buslov <vladbu@...lanox.com>,
        Raed Salem <raeds@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 5/5] net/mlx5: Clear LAG notifier pointer after unregister

From: Eli Cohen <eli@...lanox.com>

After returning from unregister_netdevice_notifier_dev_net(), set the
notifier_call field to NULL so successive call to mlx5_lag_add() will
function as expected.

Fixes: 7907f23adc18 ("net/mlx5: Implement RoCE LAG feature")
Signed-off-by: Eli Cohen <eli@...lanox.com>
Reviewed-by: Vlad Buslov <vladbu@...lanox.com>
Reviewed-by: Raed Salem <raeds@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lag.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag.c
index 8e19f6ab8393..93052b07c76c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag.c
@@ -615,8 +615,10 @@ void mlx5_lag_remove(struct mlx5_core_dev *dev)
 			break;
 
 	if (i == MLX5_MAX_PORTS) {
-		if (ldev->nb.notifier_call)
+		if (ldev->nb.notifier_call) {
 			unregister_netdevice_notifier_net(&init_net, &ldev->nb);
+			ldev->nb.notifier_call = NULL;
+		}
 		mlx5_lag_mp_cleanup(ldev);
 		cancel_delayed_work_sync(&ldev->bond_work);
 		mlx5_lag_dev_free(ldev);
-- 
2.24.1