tree a09e2e675c33906619c80ade04a6a76c13c99566
parent 2ffbb8377c7a0713baf6644e285adc27a5654582
author Zhang Rui <rui.zhang@intel.com> 1195583939 -0500
committer Len Brown <len.brown@intel.com> 1195584123 -0500

ACPI: disable stray GPE, prevent ACPI interrupt storm

GPEs are disabled depending on their type --
WAKE, WAKE_RUN, and RUNTIME.  An error is returned
if we are asked to disable a GPE that has no type.

But at least one system exists that enables a GPE from AML
that is not the EC GPE, and has no _Lxx/_Exx AML handler,
and is thus never initialized.

In this case, when an external CRT is plugged in,
the GPE fires, we attempt to disable the GPE,
but instead just return an error.
So the GPE stays asserted and an ACPI interrupt storm follows.

The fix is to disable a firing GPE,
even if it comes from outer space.

http://bugzilla.kernel.org/show_bug.cgi?id=6217

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>