OK, the attached is a sketch of an implementation of bus_type operations.
It renames all the platform dma_ operations to platform_dma_ and will call
only the bus specific operation if it exists. Thus it will be the
responsibility of the bus to call the platform_dma_ functions correctly (this
one is a large loaded gun).
The answer to error handling in the general case is still no (because I don't
want to impact the main line code for a specific problem, and the main line is
x86 which effectively has infinite mapping resources), but I don't see why the
platforms can't export a set of values they guarantee not to return as
dma_addr_t's that you can use for errors in the bus implementations.
Would this solve most of your problems?
James
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