> I thought as much, but maybe there is some driver which can offload > whole i2c_transfer to HW, and has to pass the addresses of the buffers > to the HW, and the HW can have problems if the buffers overlap > somewhere...
Well, sure, you can never know what crazy HW is out there :) But that shouldn't prevent us from doing legit I2C transfers. The likeliness of such HW is low enough; They must process the whole transfer in one go (rare) AND have the limitiation with the buffer pointers (at least I don't know one) AND have no possibility of a fallback to a simpler mode where they can handle the transfer per message. If such a controller exists, it would need a new quirk flag, I'd say, and reject the transfer. But that shouldn't stop you from fixing your issue. Thanks for thinking thoroughly about drawbacks! Much appreciated.
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