This patch cleans up the wait queue usage in this driver.  The state is
no longer set until just before the task sleeps, which removes a few
set_current_state()s. Correspondingly, the state doesn't need to be set
back to TASK_RUNNING outside of the while-loops, as schedule_timeout()
takes care of it.
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>