netdev - [net-next 03/16] net/mlx5: Take TIR destruction out of the TIR list lock

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Date:   Mon, 26 Jul 2021 09:55:31 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Tariq Toukan <tariqt@...dia.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [net-next 03/16] net/mlx5: Take TIR destruction out of the TIR list lock

From: Maxim Mikityanskiy <maximmi@...dia.com>

res->td.list_lock protects the list of TIRs. There is no point to call
mlx5_core_destroy_tir() and invoke a firmware command under this lock.
This commit moves this call outside of the lock and puts it after
deleting the TIR from the list to ensure that TIRs are always alive
while in the list.

Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_common.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_common.c b/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
index 8c166ee56d8b..f3bdd063051a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
@@ -58,9 +58,10 @@ void mlx5e_destroy_tir(struct mlx5_core_dev *mdev,
 	struct mlx5e_hw_objs *res = &mdev->mlx5e_res.hw_objs;
 
 	mutex_lock(&res->td.list_lock);
-	mlx5_core_destroy_tir(mdev, tir->tirn);
 	list_del(&tir->list);
 	mutex_unlock(&res->td.list_lock);
+
+	mlx5_core_destroy_tir(mdev, tir->tirn);
 }
 
 void mlx5e_mkey_set_relaxed_ordering(struct mlx5_core_dev *mdev, void *mkc)
-- 
2.31.1