linux-kernel - Re: Nobody cared about IRQs at shutdown

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Message-ID: <Pine.LNX.4.44L0.1012010948270.1629-100000@iolanthe.rowland.org>
Date:	Wed, 1 Dec 2010 09:59:49 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Alexander E. Patrakov" <patrakov@...il.com>
cc:	linux-kernel@...r.kernel.org, <linux-usb@...r.kernel.org>
Subject: Re: Nobody cared about IRQs at shutdown

On Wed, 1 Dec 2010, Alexander E. Patrakov wrote:

> Alan Stern wrote:
> > On Tue, 30 Nov 2010, Alexander E. Patrakov wrote:
> > 
> > > In fact, I think that there is something bad, not specific to USB, 
> > > FireWire or SATA. Without systemd, all those subsystems function 
> > > properly at shutdown. With systemd, it looks like there are many 
> > > mishandled interrupts (all of USB, FireWire and SATA) at shutdown.
> > > WhatÂ Â   could be this common thing? ACPI?
> > 
> > I don't know -- what is systemd?
> 
> Systemd is a new init developed by Lennart Poettering. You can learn more at http://freedesktop.org/wiki/Software/systemd
> 
> It employs high concurrency in starting and stopping services, starts many things on demand and thus boots faster than the traditional SysV init. And also exposes this bug :(

All right.

One last test.  What happens if you unbind the firewire driver and all
the UHCI controllers except the one attached to IRQ 16?

Possible explanations: IRQs are being misrouted, so the system thinks
it gets IRQ 16 when in fact a different interrupt line was activated
(this is related to ACPI, but I don't see any connection to systemd).  
Or the interrupt layer is malfunctioning and it thinks IRQs are
arriving when they aren't.

Alan Stern

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