netdev - [net-next 13/15] net/mlx5: A write memory barrier is sufficient in EQ ci update

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Message-Id: <20190402230350.30073-14-saeedm@mellanox.com>
Date:   Tue,  2 Apr 2019 16:03:48 -0700
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 13/15] net/mlx5: A write memory barrier is sufficient in EQ ci update

From: Tariq Toukan <tariqt@...lanox.com>

Soften the memory barrier call of mb() by a sufficient wmb() in the
consumer index update of the event queues.

Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 46a747f7c162..e9837aeb7088 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -707,7 +707,7 @@ void mlx5_eq_update_ci(struct mlx5_eq *eq, u32 cc, bool arm)
 
 	__raw_writel((__force u32)cpu_to_be32(val), addr);
 	/* We still want ordering, just not swabbing, so add a barrier */
-	mb();
+	wmb();
 }
 EXPORT_SYMBOL(mlx5_eq_update_ci);
 
-- 
2.20.1