netdev - Re: linkwatch bustage in git-net

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Date:	Tue, 08 May 2007 23:22:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org
Subject: Re: linkwatch bustage in git-net

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Tue, 8 May 2007 23:11:43 -0700

> On Wed, 9 May 2007 15:45:58 +1000 Herbert Xu <herbert@...dor.apana.org.au> wrote:
> 
> > On Wed, May 09, 2007 at 03:31:55PM +1000, Herbert Xu wrote:
> > > 
> > > Hmm, I don't see it here (probably because we use different NICs).
> > > But does this help?
> > 
> > Thinking about it again I don't think it will help you because if your
> > carrier started out as off then it would've been considered an urgent
> > event anyway.
> > 
> > So what NIC are you using? And where abouts in the boot process is it
> > hanging? For exmaple, is it hanging when obtaining a DHCP address?
> > 
> > In any case, this patch can't hurt.  So here's one with a changelog:
> > 
> > [NET] link_watch: Eliminate potential delay on wrap-around
> 
> hm, that fixed it.  Do we know why? ;)

I wonder if, because of how we initialize jiffies on bootup to find
wraparound bugs, urgent_event is always true.

If it is always true, linkwatch_nextevent will never get updated.
Herbert's patch indirectly corrects that.

In the mean time I'll stick Herbert's patch into net-2.6
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