Complete processing of the memory after an I/O transfer finishes.
DEPRECATED The direction of the I/O just completed, or kIODirectionNone for the direction specified by the memory descriptor.
An IOReturn code.
This method should not be called unless a prepare was previously issued; the prepare() and complete() must occur in pairs, before and after an I/O transfer involving pageable memory. In 10.3 or greater systems the direction argument to complete is not longer respected. The direction is totally determined at prepare() time.