Re: [PATCH] acpi: Avoid dropping rapid hotkey events (or other GPEs)on Asus EeePC

From: Alan Jenkins
Date: Thu Jul 17 2008 - 12:02:56 EST

Alexey Starikovskiy wrote:
> Hi Alan,
> Could you please test if your patch works with the last patch in #10919?
> Thanks,
> Alex.
Vacuously so.

My patch still applies, but #10919 makes it obsolete. My patch fixed a
bug that shows up in polling mode. #10919 kills polling mode.

I've tested v2.6.26 + #10919 and it works fine (except for spamming the
kernel log - please read my Bugzilla comment).

It appears that interrupt mode suffered from a race which is very
similar to my original problem. If two GPE interrupts arrive before the
workqueue runs, then the second interrupt will be ignored because
EC_FLAGS_QUERY_PENDING is still set. This will happen with any EC if
interrupts are very close together, right?

I think my patch also fixes this theoretical problem. But I'd rather
you took over on this. I was already confused by ec.c in v2.6.26, and
with #10919 I understand it even less. E.g. why is
ec_switch_to_poll_mode() still present; what does it do now do_ec_poll()
is removed?

I'm happy to work on this with you, but I'd need to be able understand
the code first :-(.

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