On Mon, Apr 22, 2013 at 10:01:36AM +0200, Ingo Molnar wrote:
> Hm, this really smells like a workaround: treating the symptom, not
> the cause.
Well, I just tested Takashi's add missing synchronize_irq() to the
suspend path of snd_hda_intel and it doesn't help.
So it could be an issue with this driver or only this hw/driver can
exacerbate RCU this much to trigger the spurious irq machinery.
> How can an increase in grace-periods break drivers and suspend? Do we
> understand exactly what happens there?
I'd rather look into Paul's direction here. :)
> If we do, can we fix that instead of tweaking the RCU timeouts?
Well, I was under the impression yesterday that we actually want
to switch to expedited grace periods for suspend/resume *anyway*,
regardless of drivers.
Paul?
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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