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.

From: Lennart Sorensen
Date: Wed Jan 20 2010 - 16:46:12 EST

On Wed, Jan 20, 2010 at 03:20:46PM -0500, Alan Stern wrote:
> Okay, this means that something else is affecting the IRQ line.

Yep. I went and disabled irq5 on the LPC bus, and that didn't help.

> > 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.

Certainly seems to be the case.

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

Well I just tried another box, and same thing.

If I boot with 'irqpoll' then everything seems fine.

Any idea how I can figure out why irqpoll makes it happy? Does it give
any reports anywhere about misrouted irqs?

Len Sorensen
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