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Perform DMA unmapping operations before processing data. Otherwise, there may be unsynchronized data accessed by the CPU when the SWIOTLB is enabled. Signed-off-by: Zhiqi Song <songzhiqi1@huawei.com> Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>