On Sunday 09 June 2013 23:18:28 Ming Lei wrote:

2), the biggest change is the situation in which usb_submit_urb() is called
in complete() callback, so the introduced tasklet schedule delay might be a
con, but it shouldn't be a big deal:

        - control/bulk asynchronous transfer isn't sensitive to schedule
          delay

That is debatable.Missing a frame boundary is expensive because the increased
latency then translates into lower throughput.

	Regards
		Oliver