156
156
* includes the size (excluding header) of URBs that have been submitted but
157
157
* have not yet been sent to to the device, and bytes that have been sent out
158
158
* of the port but not yet reported sent by the "xmit_empty" messages (which
161
161
* - Starts at zero when port is initialised.
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162
* - is incremented by the size of the data to be written (no headers)