netdev - Re: [PATCH 2/3] sky2: Reading registers in reset causes a hang

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Date:	Tue, 13 Oct 2009 09:00:38 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Mike McCormack <mikem@...g3k.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] sky2: Reading registers in reset causes a hang

On Tue, 13 Oct 2009 07:36:45 +0900
Mike McCormack <mikem@...g3k.org> wrote:

> 2009/10/13 Stephen Hemminger <shemminger@...ux-foundation.org>
> >
> > On Mon, 12 Oct 2009 23:06:37 +0900
> > Mike McCormack <mikem@...g3k.org> wrote:
> >
> > > When sky2 hardware is in reset, reading registers with ethtool -d
> > > causes a hard system hang. eg.
> > >
> > >     ifconfig eth1 down
> > >     ethtool -d eth1
> > >
> > > Avoid reading FIFOs, descriptor and status unit, etc. after we've
> > >  bought the interface down, as these seem to cause the issue.
> > >
> > > Assume the same is true for the second port, as my port only has
> > >  one card.
> >
> > I don't see this on my cards. Let me investigate further before
> > committing this. Also, the debugfs interface would also be screwed
> > if the registers were unavailable.
> 
> I forgot to include one other piece of information... I'm running a
> ping -f at the sky2 interface on a remote machine. I'll check debugfs
> tonight.
> 

You are flooding a down interface??
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