net/mlx4_en: Check device state when setting coalescing

When the device is down, CQs are freed. We must check the device state
to avoid issuing firmware commands on non existing CQs.

CC: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/en_ethtool.c

@@ -53,10 +53,12 @@ static int mlx4_en_moderation_update(struct mlx4_en_priv *priv)
 	for (i = 0; i < priv->tx_ring_num; i++) {
 		priv->tx_cq[i].moder_cnt = priv->tx_frames;
 		priv->tx_cq[i].moder_time = priv->tx_usecs;
+		if (priv->port_up) {
 			err = mlx4_en_set_cq_moder(priv, &priv->tx_cq[i]);
 			if (err)
 				return err;
 		}
+	}
 
 	if (priv->adaptive_rx_coal)
 		return 0;
@@ -65,10 +67,12 @@ static int mlx4_en_moderation_update(struct mlx4_en_priv *priv)
 		priv->rx_cq[i].moder_cnt = priv->rx_frames;
 		priv->rx_cq[i].moder_time = priv->rx_usecs;
 		priv->last_moder_time[i] = MLX4_EN_AUTO_CONF;
+		if (priv->port_up) {
 			err = mlx4_en_set_cq_moder(priv, &priv->rx_cq[i]);
 			if (err)
 				return err;
 		}
+	}
 
 	return err;
 }