netdev - Re: REGRESSION: panic on e1000 driver

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Date:	Wed, 30 May 2007 19:31:31 -0400
From:	Doug Chapman <doug.chapman@...com>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net, doug.chapman@...com
Subject: Re: REGRESSION: panic on e1000 driver

On Wed, 2007-05-30 at 15:57 -0700, Kok, Auke wrote:
> Doug Chapman wrote:
> > All,
> > 
> > I reported this a few weeks ago and it was fixed but it appears the
> > offending code was again re-submitted.  This causes a panic on HP
> > Integrity servers and from what I hear many other platforms using e1000
> > as well.
> > 
> > My original report was via kernel.org BZ:
> > http://bugzilla.kernel.org/show_bug.cgi?id=8455
> > 
> > I am seeing the same panic with a kernel built from today's git pull.
> > 
> > 
> > It was fixed by this commit:
> > 3e1657c8ef53e1cd541cc1e420f3230dc075949b
> > 
> > 
> > but once again broken just yesterday by the following commit.  I have
> > backed just this commit out and verified I no longer panic.
> > 
> > 
> > commit 47313054352b879a2bc65379d55b05f48a0af7ec
> > Author: Herbert Xu <herbert@...dor.apana.org.au>
> > Date:   Tue May 29 15:07:31 2007 -0700
> > 
> >     e1000: restore netif_poll_enable call but make sure IRQs are off
> 
> Hmm, we're making a mess of it.
> 
> Herbert, wouldn't it just have been a lot easier to do just add a 
> netif_poll_disable in e1000_probe, so that any and all other poll 
> enable/disables are symmetric ? Something like this?
> 
> Auke
> 
> 
> PS: apologies for the whitespace damage... it's a cut'n'paste
> ---
> 
> Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
> 
> diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
> index 49be393..a8a3c5f 100644
> --- a/drivers/net/e1000/e1000_main.c
> +++ b/drivers/net/e1000/e1000_main.c
> @@ -1149,6 +1149,7 @@ e1000_probe(struct pci_dev *pdev,
>          /* tell the stack to leave us alone until e1000_open() is called */
>          netif_carrier_off(netdev);
>          netif_stop_queue(netdev);
> +       netif_poll_disable(netdev);
> 
>          DPRINTK(PROBE, INFO, "Intel(R) PRO/1000 Network Connection\n");

Auke,

I tested this and it does indeed fix the panic on my systems.  I will
leave the decision as to if it is the "right" thing to do to those who
are more knowledgeable with the code.

- Doug


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