netdev - [net 1/2] net/mlx5e: Fix a race with XSKICOSQ in XSK wakeup flow

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Date:   Thu, 15 Aug 2019 18:47:06 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 1/2] net/mlx5e: Fix a race with XSKICOSQ in XSK wakeup flow

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

Add a missing spinlock around XSKICOSQ usage at the activation stage,
because there is a race between a configuration change and the
application calling sendto().

Fixes: db05815b36cb ("net/mlx5e: Add XSK zero-copy support")
Signed-off-by: Maxim Mikityanskiy <maximmi@...lanox.com>
Reviewed-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c
index aaffa6f68dc0..7f78c004d12f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/setup.c
@@ -143,7 +143,10 @@ void mlx5e_activate_xsk(struct mlx5e_channel *c)
 {
 	set_bit(MLX5E_RQ_STATE_ENABLED, &c->xskrq.state);
 	/* TX queue is created active. */
+
+	spin_lock(&c->xskicosq_lock);
 	mlx5e_trigger_irq(&c->xskicosq);
+	spin_unlock(&c->xskicosq_lock);
 }
 
 void mlx5e_deactivate_xsk(struct mlx5e_channel *c)
-- 
2.21.0