Hi, I have a new question concerning documentation.
https://www.kernel.org/doc/html/latest/driver-api/dmaengine/client.html >From this document it is not really clear, at least to me, if clients can consider valid the `struct dma_async_tx_descriptor` after submission to the DMA engine. Clients get a TX descriptor from a DMA engine using things like `dmaengine_prep_*`. These calls - may - allocate new descriptors and return them to the caller; this may include other structures which are not visible to clients. So, if my understanding is correct, this means that it's the DMA engine that, on TX completion, releases any TX descriptor allocated by `dmaengine_prep_*`. This implies that the pointer that the client is using must be considered invalid right after `dmaengine_submit()`. If what I understood by reading the documentation and the code is correct, then I think that this should be mentioned in the Documentation. If I'm wrong, please tell me where :) Thanks
