netdev - Re: [rfc] suspicious indentation in do_tcp

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Date:	Thu, 5 Sep 2013 13:24:51 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Dave Jones <davej@...hat.com>, Yuchung Cheng <ycheng@...gle.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [rfc] suspicious indentation in do_tcp_setsockopt

On Thu, Sep 5, 2013 at 12:43 AM, Joe Perches <joe@...ches.com> wrote:
> (Adding Yuchung Cheng and Neal Cardwell as the
>  author and acker of the patch)
>
> On Thu, 2013-09-05 at 00:20 -0400, Dave Jones wrote:
>> What's the intent here ?
>>
>> This ?
>
> I think the first is most likely.

Yes, exactly. The first version makes more sense. We only need to
check thin_dupack and potentially disable early retransmit if the
setsockopt successfully changes thin_dupack.

neal


>>
>> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
>> index b2f6c74..95544e4 100644
>> --- a/net/ipv4/tcp.c
>> +++ b/net/ipv4/tcp.c
>> @@ -2454,10 +2454,11 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
>>       case TCP_THIN_DUPACK:
>>               if (val < 0 || val > 1)
>>                       err = -EINVAL;
>> -             else
>> +             else {
>>                       tp->thin_dupack = val;
>>                       if (tp->thin_dupack)
>>                               tcp_disable_early_retrans(tp);
>> +             }
>>               break;
>>
>>       case TCP_REPAIR:
>>
>> Or this ...
>>
>> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
>> index b2f6c74..187c5a4 100644
>> --- a/net/ipv4/tcp.c
>> +++ b/net/ipv4/tcp.c
>> @@ -2456,8 +2456,9 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
>>                       err = -EINVAL;
>>               else
>>                       tp->thin_dupack = val;
>> -                     if (tp->thin_dupack)
>> -                             tcp_disable_early_retrans(tp);
>> +
>> +             if (tp->thin_dupack)
>> +                     tcp_disable_early_retrans(tp);
>>               break;
>>
>>       case TCP_REPAIR:
>>
>>
>> I'll submit the right patch in the right form once I know what was intended.
>>
>> The former seems more 'correct' to me, but I'm unsure if that could break something.
>>
>>       Dave
>>
>> --
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>
>
>
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