Re: [dpdk-dev] [PATCH v4 2/4] net/virtio: improve queue init error path

["Xia, Chenbo" <chenbo.xia@intel.com>]

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Tuesday, March 16, 2021 5:38 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; amorenoz@redhat.com;
> david.marchand@redhat.com; olivier.matz@6wind.com; bnemeth@redhat.com
> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
> Subject: [PATCH v4 2/4] net/virtio: improve queue init error path
> 
> This patch improves the error path of virtio_init_queue(),
> by cleaning in reversing order all resources that have
> been allocated.
> 
> Suggested-by: Chenbo Xia <chenbo.xia@intel.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> Reviewed-by: David Marchand <david.marchand@redhat.com>
> ---
>  drivers/net/virtio/virtio_ethdev.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/virtio/virtio_ethdev.c
> b/drivers/net/virtio/virtio_ethdev.c
> index af090fdf9c..d5643733f7 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -507,7 +507,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t
> queue_idx)
>  			mz = rte_memzone_lookup(vq_name);
>  		if (mz == NULL) {
>  			ret = -ENOMEM;
> -			goto fail_q_alloc;
> +			goto free_vq;
>  		}
>  	}
> 
> @@ -533,7 +533,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t
> queue_idx)
>  				hdr_mz = rte_memzone_lookup(vq_hdr_name);
>  			if (hdr_mz == NULL) {
>  				ret = -ENOMEM;
> -				goto fail_q_alloc;
> +				goto free_mz;
>  			}
>  		}
>  	}
> @@ -547,7 +547,7 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t
> queue_idx)
>  		if (!sw_ring) {
>  			PMD_INIT_LOG(ERR, "can not allocate RX soft ring");
>  			ret = -ENOMEM;
> -			goto fail_q_alloc;
> +			goto free_hdr_mz;
>  		}
> 
>  		vq->sw_ring = sw_ring;
> @@ -604,15 +604,20 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t
> queue_idx)
> 
>  	if (VIRTIO_OPS(hw)->setup_queue(hw, vq) < 0) {
>  		PMD_INIT_LOG(ERR, "setup_queue failed");
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		goto clean_vq;
>  	}
> 
>  	return 0;
> 
> -fail_q_alloc:
> +clean_vq:
> +	hw->cvq = NULL;
>  	rte_free(sw_ring);
> +free_hdr_mz:
>  	rte_memzone_free(hdr_mz);
> +free_mz:
>  	rte_memzone_free(mz);
> +free_vq:
>  	rte_free(vq);
> 
>  	return ret;
> --
> 2.29.2

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>