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When CONFIG_NEED_SG_DMA_LENGTH is enabled, sg_dma_len is defined as follow : "#define sg_dma_len(sg) ((sg)->dma_length)" But, dma_length is not used by the framework indeed. Change-Id: I51d1adf9f2738b1036fdaf6172ae932c007fac76 Signed-off-by: chenzhen <chenzhen@rock-chips.com>