dmaengine: the purpouse of dma_async_tx_callback

[Dragos Tatulea]

Hi,

	What is the purpouse of dma_async_tx_callback from
	dma_async_tx_descriptor in the dma engine api context? It can be called
	only from the engine side and I can't see the point in that.

	At a first glance it looks like a way of notifying the dma clients of
	the descriptor completion, but on closer inspection dma clients don't
	have access to the dma_async_tx_descriptor structure, they only have
	the cookie. It would be really useful to notify clients of operation
	completion via this callback and I'd gladly provide a patch for that.

Thanks,
Dragos
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