From d8e794dfd51c368ed3f686b7f4172830b60ae47b Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 3 Aug 2012 10:30:45 -0700 Subject: workqueue: set delayed_work->timer function on initialization delayed_work->timer.function is currently initialized during queue_delayed_work_on(). Export delayed_work_timer_fn() and set delayed_work timer function during delayed_work initialization together with other fields. This ensures the timer function is always valid on an initialized delayed_work. This is to help mod_delayed_work() implementation. To detect delayed_work users which diddle with the internal timer, trigger WARN if timer function doesn't match on queue. Signed-off-by: Tejun Heo --- kernel/workqueue.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'kernel/workqueue.c') diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 30474c4e107c..55392385fe30 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1112,7 +1112,7 @@ bool queue_work(struct workqueue_struct *wq, struct work_struct *work) } EXPORT_SYMBOL_GPL(queue_work); -static void delayed_work_timer_fn(unsigned long __data) +void delayed_work_timer_fn(unsigned long __data) { struct delayed_work *dwork = (struct delayed_work *)__data; struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work); @@ -1121,6 +1121,7 @@ static void delayed_work_timer_fn(unsigned long __data) __queue_work(smp_processor_id(), cwq->wq, &dwork->work); local_irq_enable(); } +EXPORT_SYMBOL_GPL(delayed_work_timer_fn); /** * queue_delayed_work_on - queue work on specific CPU after delay @@ -1145,6 +1146,8 @@ bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq, if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) { unsigned int lcpu; + WARN_ON_ONCE(timer->function != delayed_work_timer_fn || + timer->data != (unsigned long)dwork); BUG_ON(timer_pending(timer)); BUG_ON(!list_empty(&work->entry)); @@ -1168,8 +1171,6 @@ bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq, set_work_cwq(work, get_cwq(lcpu, wq), 0); timer->expires = jiffies + delay; - timer->data = (unsigned long)dwork; - timer->function = delayed_work_timer_fn; if (unlikely(cpu >= 0)) add_timer_on(timer, cpu); -- cgit v1.2.3