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kern/45139: bugs in ACPI(CA) serialization

>Number:         45139
>Category:       kern
>Synopsis:       bugs in ACPI(CA) serialization
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>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.


Code inspection.


This may be quite difficult to fix; may require patching ACPICA itself.

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