Re: [dpdk-dev] [PATCH v2] net/mlx5: fix error number handling

["Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>]

On Tue, Jun 19, 2018 at 04:13:13PM -0700, Yongseok Koh wrote:
> rte_errno should be saved only if error has occurred because rte_errno
> could have garbage value.
> 
> Fixes: a6d83b6a9209 ("net/mlx5: standardize on negative errno values")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Yongseok Koh <yskoh@mellanox.com>

Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

> ---
>  drivers/net/mlx5/mlx5_flow.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
> index 994be05be..45207d70e 100644
> --- a/drivers/net/mlx5/mlx5_flow.c
> +++ b/drivers/net/mlx5/mlx5_flow.c
> @@ -3561,15 +3561,17 @@ mlx5_fdir_filter_delete(struct rte_eth_dev *dev,
>  		/* The flow does not match. */
>  		continue;
>  	}
> -	ret = rte_errno; /* Save rte_errno before cleanup. */
>  	if (flow)
>  		mlx5_flow_list_destroy(dev, &priv->flows, flow);
>  exit:
> +	if (ret)
> +		ret = rte_errno; /* Save rte_errno before cleanup. */
>  	for (i = 0; i != hash_rxq_init_n; ++i) {
>  		if (parser.queue[i].ibv_attr)
>  			rte_free(parser.queue[i].ibv_attr);
>  	}
> -	rte_errno = ret; /* Restore rte_errno. */
> +	if (ret)
> +		rte_errno = ret; /* Restore rte_errno. */
>  	return -rte_errno;
>  }
>  
> -- 
> 2.11.0

-- 
Nélio Laranjeiro
6WIND