Messages in this thread | | | From | Oliver Neukum <> | Subject | Re: question on odd APIC behavior | Date | Fri, 16 Nov 2007 22:34:53 +0100 |
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Am Freitag 16 November 2007 schrieb Maciej W. Rozycki: > On Fri, 16 Nov 2007, Oliver Neukum wrote: > > > > > On irq 20, there's an UHCI, on irq 19 is an EHCI. For every interrupt on 20 > > > > there's a spurious interrupt on 19. USB devices on bus of the controller on 20 > > > > work. So I know all interrupts are seen. ERR does not increase. Interrupts > > > > for devices on the bus of the controller on 19 arrive at 19 only. > > > > > > I suggest you try to sort it out with the maintainers of the UHCI and > > > EHCI drivers then. > > > > They are innocent. This laptop really delivers an interrupt twice. > > Perhaps, but these drivers are involved and the device-specific knowledge > will help tracking down the cause. I have general experience on how > interrupts work, including on APIC-based systems, but I have no idea how > UHCI and EHCI devices work in this area and, in particular, how you know > an interrupt coming from the line #19 is related to one on the line #20 > and then a spurious one if not recorded as ERR or otherwise unclaimed > (which would be reported as "irq 19: nobody cared").
I am getting irq 19:nobody cared. Interrupts on 19 and 20 increase with same rate, disconnecting the device on the bus stops the increase, reconnecting it makes them increase again.
Regards Oliver - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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