On 2 Jun 2004, Len Brown wrote:

> > If you're interested, I can explain why 2.6.4 started masking the 
> > USBSTS_HCH bit from the status register before testing whether to handle 
> > the interrupt.
> 
> USBSTS_HCH doesn't sound like a valid interrupt indicator anyway right?

The documentation is ambiguous (or wrong, depending on how you look at 
it).  But no, it isn't an interrupt indicator.

I suppose it's possible that some USB controllers are occasionally 
generating an interrupt request for no reason.  But I can't think of any 
way to test that hypothesis, and in any case it seems that there's a 
separate issue of interrupts from other devices (like network interfaces) 
being delivered on the wrong IRQ channel.

> > If you do find a resolution, please post a pointer to it on the 
> > linux-usb-devel list.  Until then, I'll recommend that people boot with 
> > "noirqdebug".
> 
> as a workaround, yes.  otherwise, please encourage them to file a bug
> and that perhaps with added information a better picture of the root
> cause will emerge.

File a bug report on Bugzilla under the ACPI component, or send a report 
to you, or what?

Alan Stern



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