Hi Alan,

ext Alan Stern wrote:
> 
> I don't know, but it's a good start.  The IRQs for uhci-hcd and
> ehci-hcd are registered using the IRQF_DISABLED flag, which means that
> the handler routines uhci_irq() and ehci_irq() should always be called
> with interrupts disabled.
> 
> So that's the next thing to test.  Put a raw_irqs_disabled() test at
> the start of those two routines, just to make sure that interrupts
> don't somehow get enabled by mistake while the routine is running.  If 
> interrupts are already enabled when the routines are called then the 
> bug is somewhere else in the kernel.

OK, I've now compiled 2.6.26-rc8 with the attached changes. The output I 
collected shows that interrupts are (always) enabled when (e|u)hci_irq() 
is entered.

I aborted the test run, i.e. I didn't run into the bug. But the kernel 
was so busy with dumping stacks that it probably wouldn't have been 
triggered at all.

Regards,

	Stefan

---
Stefan Becker
E-Mail: Stefan.Becker@nokia.com