greybus: es1-ap-usb: document the lack of callback for the outgoing bulk urbs

We don't need a callback for bulk out urbs to do anything except put the
urb back in the pool.  Document why we do this and what is involved.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
1 file changed
tree: b8f5fd7166810180811192d303bd592a4fc94b04
  1. drivers/