37754030b0
Fix up obsolete comments referring to null callback pointers for synchronous operations, and make sure a callback is always provided when sending a request. Also document that the callback is responsible for dropping the initial (and not necessarily final) reference to the operation. Signed-off-by: Johan Hovold <johan@hovoldconsulting.com> Reviewed-by: Alex Elder <elder@linaro.org> Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>