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Behaviour of IOConnectMethodStructureIStructureO

I searched through the Darwin code, but couldn't find the answer to this
question. If you make an IOConnectMethodStructureIStructureO call from user
land, does the system not update the StructureO in user land if the call
returns with an error? I was trying to return some secondary status in the
StructureO structure if the called failed in the driver, but even though I
could update the field value in the StructureO structure at the kernel level
(and saw it change with an IOLog), if I returned from the kernel with
anything other than kIOReturnSuccess then the field that I updated would not
reflect the change that I made in the kernel back in user land. Is this by
design?

Thanks,
Rob
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