On 8/25/21 11:56 AM, Dan Carpenter wrote:
> Hello Dmytro Linkin,
>
> The patch f47e04eb96e0: "net/mlx5: E-switch, Allow setting share/max
> tx rate limits of rate groups" from May 31, 2021, leads to the
> following Smatch static checker warning:
>
> drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c:483 esw_qos_create_rate_group()
> warn: passing zero to 'ERR_PTR'
>
> drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c
> 434 static struct mlx5_esw_rate_group *
> 435 esw_qos_create_rate_group(struct mlx5_eswitch *esw, struct netlink_ext_ack *extack)
> 436 {
> 437 u32 tsar_ctx[MLX5_ST_SZ_DW(scheduling_context)] = {};
> 438 struct mlx5_esw_rate_group *group;
> 439 u32 divider;
> 440 int err;
> 441
> 442 if (!MLX5_CAP_QOS(esw->dev, log_esw_max_sched_depth))
> 443 return ERR_PTR(-EOPNOTSUPP);
> 444
> 445 group = kzalloc(sizeof(*group), GFP_KERNEL);
> 446 if (!group)
> 447 return ERR_PTR(-ENOMEM);
> 448
> 449 MLX5_SET(scheduling_context, tsar_ctx, parent_element_id,
> 450 esw->qos.root_tsar_ix);
> 451 err = mlx5_create_scheduling_element_cmd(esw->dev,
> 452 SCHEDULING_HIERARCHY_E_SWITCH,
> 453 tsar_ctx,
> 454 &group->tsar_ix);
> 455 if (err) {
> 456 NL_SET_ERR_MSG_MOD(extack, "E-Switch create TSAR for group failed");
> 457 goto err_sched_elem;
> 458 }
> 459
> 460 list_add_tail(&group->list, &esw->qos.groups);
> 461
> 462 divider = esw_qos_calculate_min_rate_divider(esw, group, true);
> 463 if (divider) {
> 464 err = esw_qos_normalize_groups_min_rate(esw, divider, extack);
> 465 if (err) {
> 466 NL_SET_ERR_MSG_MOD(extack, "E-Switch groups normalization failed");
> 467 goto err_min_rate;
>
> Wouldn't we want to we want to propagate this error code
>
>
> 468 }
> 469 }
> 470 trace_mlx5_esw_group_qos_create(esw->dev, group, group->tsar_ix);
> 471
> 472 return group;
> 473
> 474 err_min_rate:
> 475 list_del(&group->list);
> 476 err = mlx5_destroy_scheduling_element_cmd(esw->dev,
> 477 SCHEDULING_HIERARCHY_E_SWITCH,
> 478 group->tsar_ix);
>
> instead of this one? Also if this succeeds we return succeess?
>
> 479 if (err)
> 480 NL_SET_ERR_MSG_MOD(extack, "E-Switch destroy TSAR for group failed");
> 481 err_sched_elem:
> 482 kfree(group);
> --> 483 return ERR_PTR(err);
> 484 }
>
> regards,
> dan carpenter
>
Hello Dan,
Thanks for reporting.
Do I need additional reference to Your report except Reported-by?
Regards,
Dmytro
