linux-kernel - Re: PCI, ACPI, IRQ, IOAPIC: reroute PCI interrupt to legacy boot interrupt equivalent

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Message-ID: <20090112113720.GB21051@elte.hu>
Date:	Mon, 12 Jan 2009 12:37:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Stefan Assmann <sassmann@...e.de>
Cc:	Len Brown <lenb@...nel.org>, Bjorn Helgaas <bjorn.helgaas@...com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Olaf Dabrunz <od@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Sven Dietrich <sdietrich@...ell.com>
Subject: Re: PCI, ACPI, IRQ, IOAPIC: reroute PCI interrupt to legacy boot
	interrupt equivalent


* Stefan Assmann <sassmann@...e.de> wrote:

> Why can these IRQ lines be brought down by Boot Interrupts? Because 
> there's no handler installed on the primary IO-APIC IRQ line that can 
> take care of them and after too many unhandled IRQs the line will be 
> shut down by the kernel.

The failure mode can be quite nasty: ranging from non-working USB (and 
other) devices to hard lockups due to screaming IRQs.

	Ingo
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