[ofw] [RFC] [PATCH 3/12] winverbs: define IOCTL interface

[Sean Hefty]

>I haven't had a chance to look at these in depth, but the first thing that
>jumped out at me is you want to make sure you have unique values for your
>IOCTLs from IBAL, so that both IBAL and your WV kernel driver can be in the
>same device stack and be able to distinguish one another's IOCTLs (looking at
>the code it seems that IBAL doesn't start its function codes at above 0x800,
>which it should).

This seems like a general problem with multiple filter drivers.

Can you have multiple stacks for the same physical device?

- Sean