linux-kernel - Re: [PATCH net-next 16/19] net: hns: fix bug that alloc skb fail lead to port unavailable

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Message-ID: <5769ECD7.8080303@huawei.com>
Date:	Wed, 22 Jun 2016 09:41:43 +0800
From:	Yisen Zhuang <Yisen.zhuang@...wei.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	<davem@...emloft.net>, <salil.mehta@...wei.com>,
	<yankejian@...wei.com>
CC:	<liguozhu@...wei.com>, <huangdaode@...ilicon.com>, <arnd@...db.de>,
	<andriy.shevchenko@...ux.intel.com>, <andrew@...n.ch>,
	<geliangtang@....com>, <ivecera@...hat.com>,
	<fengguang.wu@...el.com>, <charles.chenxin@...wei.com>,
	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linuxarm@...wei.com>
Subject: Re: [PATCH net-next 16/19] net: hns: fix bug that alloc skb fail lead
 to port unavailable



在 2016/6/21 21:25, Sergei Shtylyov 写道:
> Hello.
> 
> On 6/21/2016 6:56 AM, Yisen Zhuang wrote:
> 
>> From: Jun He <hjat2005@...wei.com>
>>
>> When hns_nic_poll_rx_skb alloc skb fail, it will break receive cycle and
>> read new fbd_num to start new receive cycle. It recomputes cycle num is
>> fbd_num minus clean_count, actually this cycle num is too big because
>> it drop out receive cycle. It brings about the port unavailable.
>>
>> So we will goto out when alloc skb fail to fix this bug.
>>
>> Signed-off-by: Jun He <hjat2005@...wei.com>
>> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
>> Signed-off-by: Yisen Zhuang <Yisen.Zhuang@...wei.com>
>> ---
>>  drivers/net/ethernet/hisilicon/hns/hns_enet.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
>> index f49246d..c0ce37b 100644
>> --- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
>> +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
>> @@ -768,10 +768,10 @@ recv:
>>              clean_count = 0;
>>          }
>>
>> -        /* poll one pkg*/
>> +        /* poll one pkt*/

I will fix it with a new patch.

Thanks,

Yisen

> 
>    How about adding a space before */?
> 
> [...]
> 
> MBR, Sergei
> 
> 
> .
>