net/mlx5: E-switch, Don't update group if qos is not enabled

Currently, qos group will be updated and qos will be enabled when
unregistering devlink port. Actually no need to update group if qos
is not enabled.

Add a check to prevent unnecessary enabling and disabling qos for
every port.
Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Dmytro Linkin <dlinkin@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c

@@ -924,12 +924,16 @@ int mlx5_esw_qos_vport_update_group(struct mlx5_eswitch *esw,
 				    struct mlx5_esw_rate_group *group,
 				    struct netlink_ext_ack *extack)
 {
-	int err;
+	int err = 0;
 
 	mutex_lock(&esw->state_lock);
+	if (!vport->qos.enabled && !group)
+		goto unlock;
+
 	err = esw_qos_vport_enable(esw, vport, 0, 0, extack);
 	if (!err)
 		err = esw_qos_vport_update_group(esw, vport, group, extack);
+unlock:
 	mutex_unlock(&esw->state_lock);
 	return err;
 }