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Date:	Thu, 24 Jul 2008 20:50:32 -0700
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	James Le Cuirot <chewi@...a-online.co.uk>,
	suspend-devel@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	netdev@...r.kernel.org
Subject: Re: [Suspend-devel] TAP (and TUN?) devices not working after resume



Rafael J. Wysocki wrote:
> On Monday, 14 of July 2008, James Le Cuirot wrote:
>> Hi,
> 
> Hi,
> 
>> uswsusp works great on my machine except for one thing. I use a TAP
>> device for QEMU and after resuming from suspend, it doesn't work
>> anymore until I delete it and recreate it. This is rather annoying
>> because if I have QEMU open, it means I have to close it before
>> recreating the interface and then boot Windows up again. I use OpenVPN
>> to create/delete the interface but I think that's all it does. The rest
>> is done by the kernel. So I'm guessing something's up with the TUN/TAP
>> driver or uswsusp itself. I'm using version 0.8. Sorry if this has
>> already been fixed.
> 
> This is a kernel problem, adding kernel-related CCs.

I bet it's flow control related. I've fixed a bug in flow control handling for
persistent devices recently.
btw Does it still happen with >= 2.6.26 ?

I'll play with some test code on my laptop and see if I can reproduce this issue.

Max
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