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Date: Tue, 1 Apr 2008 09:20:31 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Martin Michlmayr <tbm@cyrius.com>
cc: Stefan Richter <stefanr@s5r6.in-berlin.de>,
       linux1394-devel@lists.sourceforge.net,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>,
       "H. Peter Anvin" <hpa@zytor.com>, Jon Masters <jonathan@jonmasters.org>
Subject: Re: nobody cared about IRQ 19 (firewire, on a HP 2510p notebook)
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References: <20080321153952.GA26354@deprecation.cyrius.com> <47E3E2CF.5070408@s5r6.in-berlin.de> <47EF757F.9080501@s5r6.in-berlin.de> <20080330161339.GC28821@deprecation.cyrius.com> <47EFD09D.3020906@s5r6.in-berlin.de> <alpine.LFD.1.10.0803302201110.3219@apollo.tec.linutronix.de>
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On Mon, 31 Mar 2008, Martin Michlmayr wrote:
> * Thomas Gleixner <tglx@linutronix.de> [2008-03-31 12:17]:
> > > I've attached all of that information.
> > 
> > Do you have CONFIG_NET_POLL_CONTROLLER enabled in your .config ? If
> > yes, can you please disable it and check whether the problem persists ?
> 
> CONFIG_NET_POLL_CONTROLLER was indeed set.  When I disable it, the
> problem goes away.
> 
> What does that mean?

E1000e does in e1000_netpoll():

       disable_irq(adapter->pdev->irq); 
       ...
       enable_irq(adapter->pdev->irq); 

The network card interrupt is rerouted to a legacy interrupt on
irq_disable(), in your case irq 19.

Sigh, there is not much we can do about that...

@Jon: Any idea ? Can you please gather some more info about that
oddity. It will come back... :(

Thanks,

	tglx