netdev - [net-next 02/15] net/mlx5: Lag, Don't rescan if the device is going down

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Date:   Mon, 14 Jun 2021 21:01:10 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Leon Romanovsky <leonro@...dia.com>,
        Mark Bloch <mbloch@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 02/15] net/mlx5: Lag, Don't rescan if the device is going down

From: Mark Bloch <mbloch@...dia.com>

If MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV is set it means the device is going
down and mlx5_rescan_drivers_locked() shouldn't be called.
With this patch and the previous one in the series, unbinding a PCI
function when its netdev is part of a bond works and leaves the system in a
working state.

Signed-off-by: Mark Bloch <mbloch@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lag.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag.c b/drivers/net/ethernet/mellanox/mlx5/core/lag.c
index 6642ff0115f8..4a4e9b228ba0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag.c
@@ -258,6 +258,10 @@ static void mlx5_lag_add_devices(struct mlx5_lag *ldev)
 		if (!ldev->pf[i].dev)
 			continue;
 
+		if (ldev->pf[i].dev->priv.flags &
+		    MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV)
+			continue;
+
 		ldev->pf[i].dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_IB_ADEV;
 		mlx5_rescan_drivers_locked(ldev->pf[i].dev);
 	}
@@ -286,8 +290,10 @@ static void mlx5_disable_lag(struct mlx5_lag *ldev)
 	roce_lag = __mlx5_lag_is_roce(ldev);
 
 	if (roce_lag) {
-		dev0->priv.flags |= MLX5_PRIV_FLAGS_DISABLE_IB_ADEV;
-		mlx5_rescan_drivers_locked(dev0);
+		if (!(dev0->priv.flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV)) {
+			dev0->priv.flags |= MLX5_PRIV_FLAGS_DISABLE_IB_ADEV;
+			mlx5_rescan_drivers_locked(dev0);
+		}
 		mlx5_nic_vport_disable_roce(dev1);
 	}
 
-- 
2.31.1