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Subjectdma_unmap_single() lacking cache sync on some archs?

I would expect cache synchronization for DMA_TO_DEVICE and DMA_BIDIRECTIONAL
when dma_map_single() is called, and for DMA_FROM_DEVICE and DMA_BIDIRECTIONAL
when dma_unmap_single() is called.

However, on some architechtures (at least avr32, blackfin, ...), cache
synchronization only happens when dma_map_single() is called (and then
irrespective of DMA direction). dma_unmap_single() is a no-op for these archs.

Isn't this a bug?

(Please CC me in responses.)

Arvid Brodin
Enea Services Stockholm AB

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