Re: clean up and modularize arch dma_mapping interface

From: Christoph Hellwig <redacted>
Date: Thu,  8 Jun 2017 15:25:25 +0200

for a while we have a generic implementation of the dma mapping routines
that call into per-arch or per-device operations.  But right now there
still are various bits in the interfaces where don't clearly operate
on these ops.  This series tries to clean up a lot of those (but not all
yet, but the series is big enough).  It gets rid of the DMA_ERROR_CODE
way of signaling failures of the mapping routines from the
implementations to the generic code (and cleans up various drivers that
were incorrectly using it), and gets rid of the ->set_dma_mask routine
in favor of relying on the ->dma_capable method that can be used in
the same way, but which requires less code duplication.

There is unlikely to be conflicts for the sparc and net changes, so I
will simply ACK them.

Thanks Christoph.