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

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Message-ID: <392fb48f0910121536x3e7c37fbjd83ef821b3617644@mail.gmail.com>
Date:	Tue, 13 Oct 2009 07:36:45 +0900
From:	Mike McCormack <mikem@...g3k.org>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] sky2: Reading registers in reset causes a hang

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.

thanks,

Mike
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