提交 f293ea92 编写于 作者: O Oleg Nesterov 提交者: Linus Torvalds

workqueue: don't save interrupts in run_workqueue()

work->func() may sleep, it's a bug to call run_workqueue() with irqs disabled.
Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 7097a87a
......@@ -227,13 +227,7 @@ EXPORT_SYMBOL_GPL(queue_delayed_work_on);
static void run_workqueue(struct cpu_workqueue_struct *cwq)
{
unsigned long flags;
/*
* Keep taking off work from the queue until
* done.
*/
spin_lock_irqsave(&cwq->lock, flags);
spin_lock_irq(&cwq->lock);
cwq->run_depth++;
if (cwq->run_depth > 3) {
/* morton gets to eat his hat */
......@@ -248,7 +242,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
cwq->current_work = work;
list_del_init(cwq->worklist.next);
spin_unlock_irqrestore(&cwq->lock, flags);
spin_unlock_irq(&cwq->lock);
BUG_ON(get_wq_data(work) != cwq);
if (!test_bit(WORK_STRUCT_NOAUTOREL, work_data_bits(work)))
......@@ -266,11 +260,11 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
dump_stack();
}
spin_lock_irqsave(&cwq->lock, flags);
spin_lock_irq(&cwq->lock);
cwq->current_work = NULL;
}
cwq->run_depth--;
spin_unlock_irqrestore(&cwq->lock, flags);
spin_unlock_irq(&cwq->lock);
}
/*
......@@ -399,6 +393,8 @@ static void flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
*/
void fastcall flush_workqueue(struct workqueue_struct *wq)
{
might_sleep();
if (is_single_threaded(wq))
flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, singlethread_cpu));
else {
......@@ -445,6 +441,8 @@ void flush_work(struct workqueue_struct *wq, struct work_struct *work)
{
struct cpu_workqueue_struct *cwq;
might_sleep();
cwq = get_wq_data(work);
/* Was it ever queued ? */
if (!cwq)
......
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