powerpc/dma: properly wire up the unmap_page and unmap_sg methods

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The unmap methods need to transfer memory ownership back from the
device to the cpu by identical means as dma_sync_*_to_cpu. I'm not
sure powerpc needs to do any work in this transfer direction, but
given that it does invalidate the caches in dma_sync_*_to_cpu already
we should make sure we also do so on unmapping.

Signed-off-by: Christoph Hellwig <hch@lst.de>
[mpe: s/dir/direction in dma_nommu_unmap_page()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Christoph Hellwig 2018-12-16 18:19:45 +01:00 • committed by Michael Ellerman

parent 9286356907

commit 0aeba2d0d2

1 changed files with 8 additions and 1 deletions

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arch/powerpc/kernel/dma.c

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