linux-kernel - Re: nobody cared about IRQ 19 (firewire, on a HP 2510p notebook)

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Message-ID: <alpine.LFD.1.10.0804010913160.3219@apollo.tec.linutronix.de>
Date:	Tue, 1 Apr 2008 09:20:31 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Martin Michlmayr <tbm@...ius.com>
cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: nobody cared about IRQ 19 (firewire, on a HP 2510p notebook)

On Mon, 31 Mar 2008, Martin Michlmayr wrote:
> * Thomas Gleixner <tglx@...utronix.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
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