kern/45139: bugs in ACPI(CA) serialization

[Jukka Ruohonen <jruohonen%iki.fi@localhost>]

>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
>Organization:
none
>Environment:
>Description:

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.

>How-To-Repeat:

Code inspection.

>Fix:

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