netdev - Re: Very strange issues with ethernet wake on lan

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Date:	Mon, 17 Aug 2009 20:30:54 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>
Subject: Re: Very strange issues with ethernet wake on lan

On Monday 17 August 2009, Maxim Levitsky wrote:
> On Sun, 2009-08-16 at 06:42 +0300, Maxim Levitsky wrote:
> > Hi,
> > 
> > I have recently put back the davicom dm9009 ethernet card into my
> > computer.
> > 
> > Some long time ago, I have written its suspend/resume routines.
> > Now I see that few things have changed, like I need to enable wake in
> > sysfs or better patch the code to do so, some nice helpers like
> > pci_prepare_to_sleep have arrived, etc.
> > 
> > 
> > I narrowed the strange issue down to following situation:
> > 
> > I reload dmfe.ko (and networkmanager is disabled)
> > I don't ifup the device, thus pretty much no hardware initialization
> > takes place (but this appears not to matter anyway)
> > 
> > I then suspend the system, and WOL doesn't work (I have patched the
> > driver to enable WOL automaticly)
> > 
> > I then, suspend again. WOL works, and continues to work as long as I
> > don't reload the driver. If I do, same situation repeats.
> > 
> > Also, after a boot, WOL works, so a reload cycle triggers that issue.
> > 
> > And most importantly, if I don't do a
> > 
> > pci_set_power_state(pci_dev, pci_choose_state (pci_dev, state));
> > 
> > in .suspend, then WOL always works.
> > 
> > and I have even tried to set state manually to PCI_D3hot or PCI_D3cold, 
> > 
> > I also tried to use pci_save_state
> > 
> > 
> > I also have 2 copies of this card, and both have this issue.
> > I also tried 2 pci slots.
> > 
> > Kernel is vanilla 2.6.31-rc5

I need a dmesg output containing at least one suspend-resume cycle
(preferably two cycles, the first one where WoL worked and another one
where it didn't).

Best,
Rafael
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