linux-kernel - Re: [PATCH] tcp: cleanup of cwnd initialization in tcp_init

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Message-ID: <1293095663.7789.3.camel@edumazet-laptop>
Date:	Thu, 23 Dec 2010 10:14:23 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Vojtech Pavlik <vojtech@...e.cz>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Subject: Re: [PATCH] tcp: cleanup of cwnd initialization in
 tcp_init_metrics()

Le jeudi 23 décembre 2010 à 10:03 +0100, Jiri Kosina a écrit :
> On Thu, 23 Dec 2010, Eric Dumazet wrote:
> 
> > Le mercredi 22 décembre 2010 à 19:39 +0100, Jiri Kosina a écrit :
> > > Commit 86bcebafc5e7f5 ("tcp: fix >2 iw selection") fixed a case when 
> > > congestion window initialization has been mistakenly omitted by 
> > > introducing cwnd label and putting backwards jump from the end of the 
> > > function.
> > > 
> > > This makes the code unnecessarily tricky to read and understand on a first 
> > > sight.
> > > 
> > > Shuffle the code around a little bit to make it more obvious.
> > 
> > Well in fine you have
> > 
> > 	if (inet_csk(sk)->icsk_rto < TCP_TIMEOUT_INIT && !tp->rx_opt.saw_tstamp)
> > 		goto reset;
> > 	goto out;
> > reset:
> > 
> > Is that really more obvious ? ;)
> 
> To me it seems much more obvious than goto from the very end of the 
> function somewhere into the middle and returning from there, but 
> definitely a matter of personal taste.
> 

You dont understand what I said. Please read again.

To me I prefer you _finish_ the cleanup so that we have :

	if (some condition) {
reset:
	}

out:

You remove two "goto" in the process.

Is that clear now ?



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