openrisc: remove the sync_single_for_cpu DMA operation

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openrisc does all the required cache maintainance at dma map time, and none
at unmap time.  It thus has to implement sync_single_for_device to match
the map cace for buffer reuse, but there is no point in doing another
invalidation in the sync_single_cpu_case, which in terms of cache
maintainance is equivalent to the unmap case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Stafford Horne <shorne@gmail.com>

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Christoph Hellwig 2018-07-19 06:02:29 -07:00 • committed by Stafford Horne

parent 1e4b044d22

commit 1902cbcc8b

1 changed files with 0 additions and 15 deletions

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arch/openrisc/kernel/dma.c

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