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-rw-r--r--kernel/workqueue.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 00ff4d08e370..1ad0ee489cd1 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -158,8 +158,8 @@ static void __queue_work(struct cpu_workqueue_struct *cwq,
*
* Returns 0 if @work was already on a queue, non-zero otherwise.
*
- * We queue the work to the CPU it was submitted, but there is no
- * guarantee that it will be processed by that CPU.
+ * We queue the work to the CPU on which it was submitted, but if the CPU dies
+ * it can be processed by another CPU.
*/
int queue_work(struct workqueue_struct *wq, struct work_struct *work)
{
@@ -815,12 +815,12 @@ void destroy_workqueue(struct workqueue_struct *wq)
spin_lock(&workqueue_lock);
list_del(&wq->list);
spin_unlock(&workqueue_lock);
- put_online_cpus();
for_each_cpu_mask(cpu, *cpu_map) {
cwq = per_cpu_ptr(wq->cpu_wq, cpu);
cleanup_workqueue_thread(cwq, cpu);
}
+ put_online_cpus();
free_percpu(wq->cpu_wq);
kfree(wq);
@@ -838,7 +838,6 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
action &= ~CPU_TASKS_FROZEN;
switch (action) {
-
case CPU_UP_PREPARE:
cpu_set(cpu, cpu_populated_map);
}
@@ -866,6 +865,12 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
}
}
+ switch (action) {
+ case CPU_UP_CANCELED:
+ case CPU_DEAD:
+ cpu_clear(cpu, cpu_populated_map);
+ }
+
return NOTIFY_OK;
}