Properly orders set_current_state() and add_wait_queue().  Uses
msleep_interruptible() in place of schedule_timeout() to guarantee the
task delays as expected. Uses set_current_state() instead of direct
assignment of current->state.
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>