dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/device
authorFugang Duan <fugang.duan@nxp.com>
Fri, 19 Jul 2019 09:26:48 +0000 (17:26 +0800)
committerChristoph Hellwig <hch@lst.de>
Fri, 19 Jul 2019 12:09:40 +0000 (14:09 +0200)
commit449fa54d6815be8c2c1f68fa9dbbae9384a7c03e
treeb1d2c2c29c8725f8e634a284e2e23c391ed0e059
parenta5008b59cd9d8de12ab623cb5052bb4735330e5c
dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/device

dma_map_sg() may use swiotlb buffer when the kernel command line includes
"swiotlb=force" or the dma_addr is out of dev->dma_mask range.  After
DMA complete the memory moving from device to memory, then user call
dma_sync_sg_for_cpu() to sync with DMA buffer, and copy the original
virtual buffer to other space.

So dma_direct_sync_sg_for_cpu() should use swiotlb physical addr, not
the original physical addr from sg_phys(sg).

dma_direct_sync_sg_for_device() also has the same issue, correct it as
well.

Fixes: 55897af63091("dma-direct: merge swiotlb_dma_ops into the dma_direct code")
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
kernel/dma/direct.c