[PATCH net-next v5 02/10] mlx4: add rtnl lock protection in mlx4_en_restart

[Hannes Frederic Sowa <hannes@stressinduktion.org>]

I don't really understand the use of the state_lock. Can't it be simply
replaced by rtnl_lock? It seems a lot of current users depend on
rtnl_lock anyway.

Anyway, fix this up for the moment.

Cc: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
---
 drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 0c7e3f69a73bb6..94abd0843901cf 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -1846,6 +1846,7 @@ static void mlx4_en_restart(struct work_struct *work)
 
 	en_dbg(DRV, priv, "Watchdog task called for port %d\n", priv->port);
 
+	rtnl_lock();
 	mutex_lock(&mdev->state_lock);
 	if (priv->port_up) {
 		mlx4_en_stop_port(dev, 1);
@@ -1853,6 +1854,7 @@ static void mlx4_en_restart(struct work_struct *work)
 			en_err(priv, "Failed restarting port %d\n", priv->port);
 	}
 	mutex_unlock(&mdev->state_lock);
+	rtnl_unlock();
 }
 
 static void mlx4_en_clear_stats(struct net_device *dev)
-- 
2.5.0