> If we imagine a scenario where host sends a IN/OUT token and device
> consistenly responds with NAK. what does the driver do in that case ?

Whatever it wants.  Usually it's correct to keep waiting for the
deice to provide the data.


> Does the driver timeout and abandaon the transaction in such a case ?

It could, but that's rarely appropriate.


> Which code fragement in the driver handles this case.

Whatever sets a timer to unlink (or kill) the URB when it times out.

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