net/mlx4_core: Change the default value of enable_qos

Change the default status of quality of service back to disabled,
as it hurts performance in some cases.

Fixes: 38438f7c7e8c ("net/mlx4: Set enhanced QoS support by default when ...")
Signed-off-by: Moshe Lazer <moshel@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -49,9 +49,9 @@ enum {
 extern void __buggy_use_of_MLX4_GET(void);
 extern void __buggy_use_of_MLX4_PUT(void);
 
-static bool enable_qos = true;
+static bool enable_qos;
 module_param(enable_qos, bool, 0444);
-MODULE_PARM_DESC(enable_qos, "Enable Enhanced QoS support (default: on)");
+MODULE_PARM_DESC(enable_qos, "Enable Enhanced QoS support (default: off)");
 
 #define MLX4_GET(dest, source, offset)				      \
 	do {							      \