[PATCH 2/2] stop_machine: dequeue work before signal completion

[Hillf Danton]

As checked with BUG_ON in the case of CPU_UP_PREPARE, we have to dequeue
work first for further actions, then stopper reaches sane and clear state.

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/kernel/stop_machine.c	Fri Feb  8 11:22:44 2013
+++ b/kernel/stop_machine.c	Fri Feb  8 11:29:40 2013
@@ -342,8 +342,12 @@ static int __cpuinit cpu_stop_cpu_callba
 		kthread_stop(stopper->thread);
 		/* drain remaining works */
 		spin_lock_irq(&stopper->lock);
-		list_for_each_entry(work, &stopper->works, list)
+		while (!list_empty(&stopper->works)) {
+			work = list_first_entry(&stopper->works,
+					struct cpu_stop_work, list);
+			list_del_init(&work->list);
 			cpu_stop_signal_done(work->done, false);
+		}
 		stopper->enabled = false;
 		spin_unlock_irq(&stopper->lock);
 		/* release the stopper */
--
--
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