ACPICA: Fix PCC OperationRegion command offsets

ACPI 6.3, section 5.5.2.4.7.3, states that the PCC Operation
Region is associated with the region of shared memory that follows the
PCC signature.

The generic and extended PCC shared memory layouts include the 4-byte
signature at offset 0, so their raw shared memory COMMAND fields are at
offsets 4 and 12 respectively. Since AML field offsets for the PCC
OperationRegion are relative to the region after that signature, ACPICA
must look for those COMMAND fields at OperationRegion offsets 0 and 8.

Adjust the generic and master subspace command checks to use those
OperationRegion-relative offsets. Otherwise writes to the COMMAND field
can fail to invoke the PCC address space handler at the offset described
by the PCC OperationRegion definition.

Link: https://github.com/open-acpica/acpica/pull/1205
Fixes: aa6ec56b574d ("ACPICA: ACPI 6.3: add PCC operation region support for AML interpreter")
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
[ rjw: Fixed the Fixes: tag ]
Link: https://patch.msgid.link/20260922144302.3847593-2-sudeep.holla@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

0 files changed, 0 insertions, 0 deletions