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kern/45139: bugs in ACPI(CA) serialization
>Synopsis: bugs in ACPI(CA) serialization
>Arrival-Date: Wed Jul 13 10:20:00 +0000 2011
>Originator: Jukka Ruohonen
>Release: NetBSD 5.99.x
Due changes in ACPICA, several hardware-related functions take spin locks,
initialized in AcpiOsCreateLock() as IPL_VM. Among these are
AcpiWriteBitRegister(), which is used for instance in the suspend code.
For example, AcpiEnterSleepState() must be called with interrupts off at
machine-level (i.e. x86_disable_intr()), yet within the function a spin
lock is acquired.
This may be quite difficult to fix; may require patching ACPICA itself.
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