Re: [dpdk-dev] [PATCH 1/2] net/mlx5: fix return value of start operation

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

On Thu, Jan 18, 2018 at 02:00:42PM +0100, Olivier Matz wrote:
> On error, mlx5_dev_start() does not return a negative value
> as it is supposed to do. The consequence is that the application
> (ex: testpmd) does not notice that the port is not started
> and begins the rxtx on an uninitialized port, which crashes.
> 
> Fixes: e1016cb73383 ("net/mlx5: fix Rx interrupts management")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
> ---
>  drivers/net/mlx5/mlx5_trigger.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
> index 1a20967a2..44f702daa 100644
> --- a/drivers/net/mlx5/mlx5_trigger.c
> +++ b/drivers/net/mlx5/mlx5_trigger.c
> @@ -166,6 +166,7 @@ mlx5_dev_start(struct rte_eth_dev *dev)
>  		ERROR("%p: an error occurred while configuring control flows:"
>  		      " %s",
>  		      (void *)priv, strerror(err));
> +		err = -err;
>  		goto error;
>  	}
>  	err = priv_flow_start(priv, &priv->flows);
> @@ -173,6 +174,7 @@ mlx5_dev_start(struct rte_eth_dev *dev)
>  		ERROR("%p: an error occurred while configuring flows:"
>  		      " %s",
>  		      (void *)priv, strerror(err));
> +		err = -err;
>  		goto error;
>  	}
>  	err = priv_rx_intr_vec_enable(priv);
> @@ -196,7 +198,7 @@ mlx5_dev_start(struct rte_eth_dev *dev)
>  	priv_rxq_stop(priv);
>  	priv_flow_delete_drop_queue(priv);
>  	priv_unlock(priv);
> -	return -err;
> +	return err;
>  }
>  
>  /**

err in the function is handled with positives errno's, adding only those
two and returning err will make the other positive.

Regards,

-- 
Nélio Laranjeiro
6WIND