netdev - Very strange issues with ethernet wake on lan

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Message-Id: <1250394174.32268.13.camel@localhost.localdomain>
Date:	Sun, 16 Aug 2009 06:42:54 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Very strange issues with ethernet wake on lan

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

Any ideas?

Best regards,
	Maxim Levitsky

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