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workqueue: don't save interrupts in run_workqueue()

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work->func() may sleep, it's a bug to call run_workqueue() with irqs disabled.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-05-09 02:34:10 -07:00 committed by Linus Torvalds
parent 7097a87afe
commit f293ea9200
1 changed files with 8 additions and 10 deletions
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18
kernel/workqueue.c
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@ -227,13 +227,7 @@ EXPORT_SYMBOL_GPL(queue_delayed_work_on);
static void run_workqueue(struct cpu_workqueue_struct *cwq) static void run_workqueue(struct cpu_workqueue_struct *cwq)
{ {
unsigned long flags; spin_lock_irq(&cwq->lock);
/*
* Keep taking off work from the queue until
* done.
*/
spin_lock_irqsave(&cwq->lock, flags);
cwq->run_depth++; cwq->run_depth++;
if (cwq->run_depth > 3) { if (cwq->run_depth > 3) {
/* morton gets to eat his hat */ /* morton gets to eat his hat */
@ -248,7 +242,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
cwq->current_work = work; cwq->current_work = work;
list_del_init(cwq->worklist.next); list_del_init(cwq->worklist.next);
spin_unlock_irqrestore(&cwq->lock, flags); spin_unlock_irq(&cwq->lock);
BUG_ON(get_wq_data(work) != cwq); BUG_ON(get_wq_data(work) != cwq);
if (!test_bit(WORK_STRUCT_NOAUTOREL, work_data_bits(work))) 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(); dump_stack();
} }
spin_lock_irqsave(&cwq->lock, flags); spin_lock_irq(&cwq->lock);
cwq->current_work = NULL; cwq->current_work = NULL;
} }
cwq->run_depth--; 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) void fastcall flush_workqueue(struct workqueue_struct *wq)
{ {
might_sleep();
if (is_single_threaded(wq)) if (is_single_threaded(wq))
flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, singlethread_cpu)); flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, singlethread_cpu));
else { else {
@ -445,6 +441,8 @@ void flush_work(struct workqueue_struct *wq, struct work_struct *work)
{ {
struct cpu_workqueue_struct *cwq; struct cpu_workqueue_struct *cwq;
might_sleep();
cwq = get_wq_data(work); cwq = get_wq_data(work);
/* Was it ever queued ? */ /* Was it ever queued ? */
if (!cwq) if (!cwq)