Hi Robert,
ACPICA commit c8eac101 (= Linux commit a83019eb9f1f, "ACPICA: Update
resource descriptor handling") is causing a regression when parsing
an empty ResourceTemplate:
acpi_dev_get_resources() now returns -EIO because acpi_walk_resources()
returns AE_AML_NO_RESOURCE_END_TAG for a buffer than contains just a
lone end_tag.
The ACPI 6.1 spec, page 800 explicitly allows empty resource templates:
ResourceTemplateTerm :=
ResourceTemplate () {ResourceMacroList} => Buffer
ResourceMacroList :=
Nothing | <ResourceMacroTerm ResourceMacroList>
^^^^^^^
Thus a term such as "ResourceTemplate () {}" is legal and should not cause
an error to be returned.
The commit claims to revert Rafael's Linux commit 1315f01632da ("Revert
"ACPICA: Resources: Not a valid resource if buffer length too long"),
but in fact does something different.
Please fix at your earliest convenience. The issue was discovered and
root-caused by Ronald Tschalär, please credit him in the fix, I'm merely
relaying the information:
Reported-by: Ronald Tschalär <ronald@xxxxxxxxxxxxx>
Thanks,
Lukas
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