Re: [PATCH net-next v13 3/3] net: hisilicon: new hip04 ethernet driver

Ding Tianhong
2015-01-15T02:56:06Z

On 2015/1/14 16:06, Joe Perches wrote:
> On Wed, 2015-01-14 at 14:34 +0800, Ding Tianhong wrote:
>> Support Hisilicon hip04 ethernet driver, including 100M / 1000M controller.
>> The controller has no tx done interrupt, reclaim xmitted buffer in the poll.
>
> Single comment:
>
>> diff --git a/drivers/net/ethernet/hisilicon/hip04_eth.c b/drivers/net/ethernet/hisilicon/hip04_eth.c
> []
>> +static int hip04_rx_poll(struct napi_struct *napi, int budget)
>> +{
> []
>> + while (cnt && !last) {
>> + buf = priv->rx_buf[priv->rx_head];
>> + skb = build_skb(buf, priv->rx_buf_size);
>> + if (unlikely(!skb))
>> + net_dbg_ratelimited("build_skb failed\n");
>> +
>> + dma_unmap_single(&ndev->dev, priv->rx_phys[priv->rx_head],
>> + RX_BUF_SIZE, DMA_FROM_DEVICE);
>> + priv->rx_phys[priv->rx_head] = 0;
>> +
>> + desc = (struct rx_desc *)skb->data;
>
> Perhaps if (!skb) is possible, there shouldn't be
> a dereference of that known null here.
>
Yes, we should return and do something to avoid oops, thanks.

Ding

>
>
> .
>