dma_buf_unmap_attachment(9) unmaps and decreases usecount of the buffer;might deallocate the scatterlist associated. Is a wrapper for unmap_dma_buf of dma_buf_ops.

SYNOPSIS

void dma_buf_unmap_attachment(struct dma_buf_attachment * attach, struct sg_table * sg_table, enum dma_data_direction direction);

ARGUMENTS

attach

[in] attachment to unmap buffer from

sg_table

[in] scatterlist info of the buffer to unmap

direction

[in] direction of DMA transfer

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