• Erik Kaneda's avatar
    ACPICA: Do not increment operation_region reference counts for field units · 6a54ebae
    Erik Kaneda authored
    ACPICA commit e17b28cfcc31918d0db9547b6b274b09c413eb70
    
    Object reference counts are used as a part of ACPICA's garbage
    collection mechanism. This mechanism keeps track of references to
    heap-allocated structures such as the ACPI operand objects.
    
    Recent server firmware has revealed that this reference count can
    overflow on large servers that declare many field units under the
    same operation_region. This occurs because each field unit declaration
    will add a reference count to the source operation_region.
    
    This change solves the reference count overflow for operation_regions
    objects by preventing fieldunits from incrementing their
    operation_region's reference count. Each operation_region's reference
    count will not be changed by named objects declared under the Field
    operator. During namespace deletion, the operation_region namespace
    node will be deleted and each fieldunit will be deleted without
    touching the deleted operation_region object.
    
    Link: https://github.com/acpica/acpica/commit/e17b28cfSigned-off-by: default avatarErik Kaneda <erik.kaneda@intel.com>
    Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    6a54ebae
utdelete.c 18.5 KB