i915_driver_irq_handler: irq 42: nobody cared

[Daniel Vetter]

On Tue, Mar 27, 2012 at 10:40:03AM +0200, Jiri Slaby wrote:
> Hi,
> 
> I'm getting spurious interrupts leading to disabling the interrupt:
>  42:    1916853    2471662   PCI-MSI-edge      i915 at pci:0000:00:02.0
> 
> The message:
> irq 42: nobody cared (try booting with the "irqpoll" option)
> Pid: 20716, comm: virtuoso-t Not tainted 3.3.0-next-20120326_64+ #1673
> 
> It is not new, but now I can reproduce it more-or-less reliably after an
> hour or so. It usually happens when playing a game using wine.
> 
> Do you want me to dump some registers when IRQ_NONE is returned from the
> ISR? As this is MSI, nobody else can sit there.

Yeah, dumping some interrupt regs if the isr returns IRQ_NONE sounds good.
For a start just dump everything that the isr itself reads out or writes
back - I think we can ignore subordinate interrupt sources in i915 for now.

And please mind the guy with bad memory and tell us which chip you have
again?

Yours, Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48