netdev - Re: [Patch V4 net 01/11] net: hns3: add error handler for hns3_nic_init_vector

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Date:   Tue, 30 Oct 2018 12:11:13 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Huazhong Tan <tanhuazhong@...wei.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linuxarm@...wei.com,
        salil.mehta@...wei.com, yisen.zhuang@...wei.com,
        lipeng321@...wei.com, linyunsheng@...wei.com
Subject: Re: [Patch V4 net 01/11] net: hns3: add error handler for
 hns3_nic_init_vector_data()

On 10/29/2018 4:54 PM, Huazhong Tan wrote:

> When hns3_nic_init_vector_data() fails to map ring to vector,
> it should cancel the netif_napi_add() that has been successfully
> done and then exits.
> 
> Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
> ---
>   drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> index 32f3aca8..d9066c5 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
> @@ -2821,7 +2821,7 @@ static int hns3_nic_init_vector_data(struct hns3_nic_priv *priv)
>   	struct hnae3_handle *h = priv->ae_handle;
>   	struct hns3_enet_tqp_vector *tqp_vector;
>   	int ret = 0;
> -	u16 i;
> +	int i, j;
>   
>   	hns3_nic_set_cpumask(priv);
>   
> @@ -2868,13 +2868,19 @@ static int hns3_nic_init_vector_data(struct hns3_nic_priv *priv)
>   		hns3_free_vector_ring_chain(tqp_vector, &vector_ring_chain);
>   
>   		if (ret)
> -			return ret;
> +			goto map_ring_fail;
>   
>   		netif_napi_add(priv->netdev, &tqp_vector->napi,
>   			       hns3_nic_common_poll, NAPI_POLL_WEIGHT);
>   	}
>   
>   	return 0;
> +
> +map_ring_fail:
> +	for (j = i - 1; j >= 0; j--)
> +		netif_napi_del(&priv->tqp_vector[j].napi);

    'j' doesn't seem needed as well.

[...]

MBR, Sergei