> just to give you an update: I do have some code, but it is a bit messy, > and it doesn't work well for ds2482 (the chip behind it still hangs up > if I access it in parallel through i2c-dev). On top of that, it causes > pretty significant slow-downs when accessing other devices on the same > bus at the same time. Not surprising, I guess, since it expands the scope > of the bus lock significantly. Just to get a better idea: Did you try taking the adapter_lock before the two SMBus command which needed to be concatenated (and use smbus_xfer directly)?
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