On Sun, May 08, 2016 at 12:59:56PM +0200, Niklas Söderlund wrote: > The call to dma_sync_single_for_device() can be reached from > dma_map_single(). If CONFIG_DMA_API_DEBUG is enabled this would result > in a check that the mapping being synced is valid. Since the call to > dma_map_single is not yet completed the mapping is not recorded in > dma-debug and the check fails and a warning is printed. Avoid this > warning by calling __dma_sync_single_for_device() which don't preform > this check. Hmm, I don't understand why this would trigger that warning. The memory being sync'd here is the page table memory, not the buffer being mapped. The page table memory is "mapped" using dma_map_single in __arm_lpae_alloc_pages, so it sounds like the issue something else. Will
