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

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On 11-03-03 03:11 PM, Alan Stern wrote:
> On Thu, 3 Mar 2011, Mark Lord wrote:
> 
>> Okay, dug out a UHCI 1.1 spec, and the indication from there
>> is that uhci_irq() can return IRQ_HANDLED in some cases where IRQ_NONE
>> is more appropriate.
> 
> What cases are those?
> 
>> Also, it is not masking the "Reserved" bits from the status register.
>> Presumably most implementations "read zero" for those bits,
>> but perhaps not all do.
> 
> Perhaps not, but I've never come across one that does.  This
> essentially amounts to saying that the only reasons a UHCI controller
> generates an interrupt request are the documented ones.
> 
> Suppose the driver did mask out the reserved bits and return IRQ_NONE 
> when none of the defined bits were set.  An implementation that did set 
> one of the reserved bits would then create an interrupt storm.

You mean, like, the "error -71" storms that I *still* get from time
to time, ever since the early 2.6.2x kernels?

Yeah, perhaps.

Cheers
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