This is what I intended to do since:
  1) the driver handles variable waits just fine, and
  2) interruptible waits aren't reported as load in the load avg.
Reported-and-tested-by: NAndreas Hartmann <andihartmann@freenet.de>
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>