linux-kernel - Re: Strange EHCI/OHCI IRQ and other PCI errors on boot with 2.6.32 (which 2.6.26 did not see) on Geode LX/CS5536.

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Date:	Wed, 20 Jan 2010 15:20:46 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
cc:	linux-kernel@...r.kernel.org, <linux-geode@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: Strange EHCI/OHCI IRQ and other PCI errors on boot with 2.6.32
 (which 2.6.26 did not see) on Geode LX/CS5536.

On Wed, 20 Jan 2010, Lennart Sorensen wrote:

> So the only difference is that now it happens 3 times instead of 2.
> Once each for ehci, ohci and amd5536udc.

Okay, this means that something else is affecting the IRQ line.

> Interestingly the number of interrupts listed in /proc/interrupts is
> exactly 300000.

That's probably because the kernel disabled the IRQ after 100000 
unhandled interrupts, and re-enabled it each time a new device was
registered for that IRQ.

> That's a lot of interrupts for a system that was just booted.

Yep.

> Hmm, I just tried booting 2.6.26 again, and now it too is failing.
> I think my box just broke.  Aghhh!
> 
> So I think that means there is no problem, I just have to go get
> another box.  I hate hardware problems. :)

Or you could just stop using USB on the old box.  :-)

Alan Stern

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