firewire: ohci: fix isochronous DMA synchronization
Add the dma_sync_single_* calls necessary to ensure proper cache synchronization for isochronous data buffers on non-coherent architectures. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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