[PATCH] hrtimers: fix oldvalue return in setitimer

This resolves bugzilla bug#5617.  The oldvalue of the timer was read after the
timer was cancelled, so the remaining time was always zero.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

kernel/itimer.c

@@ -155,16 +155,16 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
 again:
 		spin_lock_irq(&tsk->sighand->siglock);
 		timer = &tsk->signal->real_timer;
-		/* We are sharing ->siglock with it_real_fn() */
-		if (hrtimer_try_to_cancel(timer) < 0) {
-			spin_unlock_irq(&tsk->sighand->siglock);
-			goto again;
-		}
 		if (ovalue) {
 			ovalue->it_value = itimer_get_remtime(timer);
 			ovalue->it_interval
 				= ktime_to_timeval(tsk->signal->it_real_incr);
 		}
+		/* We are sharing ->siglock with it_real_fn() */
+		if (hrtimer_try_to_cancel(timer) < 0) {
+			spin_unlock_irq(&tsk->sighand->siglock);
+			goto again;
+		}
 		tsk->signal->it_real_incr =
 			timeval_to_ktime(value->it_interval);
 		expires = timeval_to_ktime(value->it_value);