> It's for draining. Let's say drive says it wanna transfer 18 bytes but
> the buffer is only 13 bytes long. If the transfer method consumes 2
> bytes per read, it would consume 14 bytes. If the transfer method
> consumes 4 bytes per read, it would consume 16 bytes. If we drain too
> much, we risk hanging the machine.
Do we have any actual cases where trying to drain beyond the controller
granuality is a problem ?
Might be cleaner to sort this (and the DMA assumption of 2 byte
alignment, and possibly 16 byte for some devices/controllers) with
dev->pio_io_size;
dev->dma_io_size;
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