net/mlx4_en: User prio mapping gets corrupted when changing number of channels

When using ethtool set_channels, mlx4_en_setup_tc is always called, even
when it was not configured. Fixed code to call mlx4_en_setup_tc() only
if needed.

Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index c3736045e7af..a72d99fd7a2d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -1151,7 +1151,8 @@ static int mlx4_en_set_channels(struct net_device *dev,
         netif_set_real_num_tx_queues(dev, priv->tx_ring_num);
         netif_set_real_num_rx_queues(dev, priv->rx_ring_num);
 
-        mlx4_en_setup_tc(dev, MLX4_EN_NUM_UP);
+        if (dev->num_tc)
+                mlx4_en_setup_tc(dev, MLX4_EN_NUM_UP);
 
         en_warn(priv, "Using %d TX rings\n", priv->tx_ring_num);
         en_warn(priv, "Using %d RX rings\n", priv->rx_ring_num);