netdev - Re: [linux-pm] hiberante hangs TCP Re: [EXAMPLE CODE] Parasite thread injection and TCP connection hijacking

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Message-ID: <20111102151039.GA12543@dhcp-172-17-108-109.mtv.corp.google.com>
Date:	Wed, 2 Nov 2011 08:10:39 -0700
From:	Tejun Heo <tj@...nel.org>
To:	MyungJoo Ham <myungjoo.ham@...il.com>
Cc:	David Fries <david@...es.net>, netdev@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] hiberante hangs TCP Re: [EXAMPLE CODE] Parasite
 thread injection and TCP connection hijacking

Hello,

On Wed, Nov 02, 2011 at 06:44:31PM +0900, MyungJoo Ham wrote:
> > Hmmm... sounds like taking down network interfaces before starting
> > hibernation sequence should be enough, which shouldn't be too
> > difficult to implement from userland.  Rafael, what do you think?
> >
> > Thanks.
> 
> Um... it seems that the "thaw" callbacks of network interfaces or TCP
> should do something on this.
> 
> Probably, the "thaw" callbacks should make sure that the TCP
> connections are closed?

I don't think it's a good idea to diddle with TCP connections from
that layer.  From what I understand, it seem all we need is plugging
tx/rx while preparing for hibernation.  That shouldn't be too
difficult.

Thanks.

-- 
tejun
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