Re: XT-PIC interrupts blocked by usbserial ? [Was Re: Intel ICH9M bug : sata unusable with usbserial]

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On Thu, 3 Mar 2011, Mark Lord wrote:

> Mmm.. I missed that part.  Very curious, that.
> I wonder if it could be some issue with how the interrupt controller is set up.
> 
> Oh the other hand, this USB-GPS is probably a "full-speed" (slow) device,
> using the UHCI interface rather than EHCI.
> 
> The uhci_irq() handler (in uhci-hcd.c) appears to always return IRQ_HANDLED,
> even when it didn't actually handle an IRQ.  If I'm reading the code correctly,
> then that's a bug, and could cause this issue given the "right" peripheral
> (eg. your USB-GPS).
> 
> I wonder if uhci_irq() can be a bit more clever and only set IRQ_HANDLED
> for interrupts that it actually had to handle?  Or am I reading it wrong?

Evidently you didn't see these lines near the start of the routine:

	status = inw(uhci->io_addr + USBSTS);
	if (!(status & ~USBSTS_HCH))	/* shared interrupt, not mine */
		return IRQ_NONE;

Alan Stern

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