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Fix mutex errors when running _REG methods.

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Fixes a problem where mutex errors can occur when running a _REG method
that is in the same scope as a method-defined operation region or an
operation region under a module-level IF block. This is rare, so the
problem has not been seen before. ACPICA BZ 826. Lin Ming, Bob Moore.
This commit is contained in:
Robert Moore 2009-12-04 09:22:56 -08:00
parent 268aa6915f
commit b7f16e21e7
1 changed files with 21 additions and 14 deletions
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35
source/components/dispatcher/dswload.c
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@ -1158,33 +1158,40 @@ AcpiDsLoad2EndOp (
}
/*
* If we are executing a method, initialize the region
* The OpRegion is not fully parsed at this time. The only valid
* argument is the SpaceId. (We must save the address of the
* AML of the address and length operands)
*
* If we have a valid region, initialize it. The namespace is
* unlocked at this point.
*
* Need to unlock interpreter if it is locked (if we are running
* a control method), in order to allow _REG methods to be run
* during AcpiEvInitializeRegion.
*/
if (WalkState->MethodNode)
{
/*
* Executing a method: initialize the region and unlock
* the interpreter
*/
Status = AcpiExCreateRegion (Op->Named.Data, Op->Named.Length,
RegionSpace, WalkState);
if (ACPI_FAILURE (Status))
{
return (Status);
}
AcpiExExitInterpreter ();
}
/*
* The OpRegion is not fully parsed at this time. Only valid
* argument is the SpaceId. (We must save the address of the
* AML of the address and length operands)
*/
/*
* If we have a valid region, initialize it
* Namespace is NOT locked at this point.
*
* TBD: need to unlock interpreter if it is locked, in order
* to allow _REG methods to be run.
*/
Status = AcpiEvInitializeRegion (AcpiNsGetAttachedObject (Node),
FALSE);
if (WalkState->MethodNode)
{
AcpiExEnterInterpreter ();
}
if (ACPI_FAILURE (Status))
{
/*