A quick question: can dma_buf_unmap_attachment be called from
interrupt context? It is the dmabuf equivalent to e.g. dma_sync_sg_for_cpu
or dma_unmap_sg, and those can be called from interrupt context.
I cannot see anything specific about this in the sources or dma-buf-sharing.txt.
If it turns out that dma_buf_unmap_attachment can be called from atomic context,
then that should be documented, I think.
Regards,
Hans
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