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| author | Tejun Heo <tj@kernel.org> | 2012-08-03 10:30:45 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-08-03 10:30:45 -0700 |
| commit | d8e794dfd51c368ed3f686b7f4172830b60ae47b (patch) | |
| tree | 72e930ab0a14bf50fa1dc6802722483247b72806 /kernel/workqueue.c | |
| parent | 8930caba3dbdd8b86dd6934a5920bf61b53a931e (diff) | |
| download | lwn-d8e794dfd51c368ed3f686b7f4172830b60ae47b.tar.gz lwn-d8e794dfd51c368ed3f686b7f4172830b60ae47b.zip | |
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 <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 7 |
1 files changed, 4 insertions, 3 deletions
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); |