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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.

Tejun Heo committed 14 years ago

Commit d8e794d1 parent 8930cab2 files · +15 −5Browse files

Showing the changes to kernel/workqueue.c (1 of 2 files). Show all

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kernel/workqueue.c+4−3
@@ -1112,7 +1112,7 @@ bool queue_work(struct workqueue_struct *wq, struct work_struct *work) · 1111 unmodified lines
1112}1112}
1113EXPORT_SYMBOL_GPL(queue_work);1113EXPORT_SYMBOL_GPL(queue_work);
1114 1114
1115static void delayed_work_timer_fn(unsigned long __data)1115void delayed_work_timer_fn(unsigned long __data)
1116{1116{
1117 struct delayed_work *dwork = (struct delayed_work *)__data;1117 struct delayed_work *dwork = (struct delayed_work *)__data;
1118 struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work);1118 struct cpu_workqueue_struct *cwq = get_work_cwq(&dwork->work);
@@ -1121,6 +1121,7 @@ static void delayed_work_timer_fn(unsigned long __data) · 2 unmodified lines
1121 __queue_work(smp_processor_id(), cwq->wq, &dwork->work);1121 __queue_work(smp_processor_id(), cwq->wq, &dwork->work);
1122 local_irq_enable();1122 local_irq_enable();
1123}1123}
1124EXPORT_SYMBOL_GPL(delayed_work_timer_fn);
1124 1125
1125/**1126/**
1126 * queue_delayed_work_on - queue work on specific CPU after delay1127 * 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, · 18 unmodified lines
1145 if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {1146 if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
1146 unsigned int lcpu;1147 unsigned int lcpu;
1147 1148
1149 WARN_ON_ONCE(timer->function != delayed_work_timer_fn ||
1150 timer->data != (unsigned long)dwork);
1148 BUG_ON(timer_pending(timer));1151 BUG_ON(timer_pending(timer));
1149 BUG_ON(!list_empty(&work->entry));1152 BUG_ON(!list_empty(&work->entry));
1150 1153
@@ -1168,8 +1171,6 @@ bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq, · 17 unmodified lines
1168 set_work_cwq(work, get_cwq(lcpu, wq), 0);1171 set_work_cwq(work, get_cwq(lcpu, wq), 0);
1169 1172
1170 timer->expires = jiffies + delay;1173 timer->expires = jiffies + delay;
1171 timer->data = (unsigned long)dwork;
1172 timer->function = delayed_work_timer_fn;
1173 1174
1174 if (unlikely(cpu >= 0))1175 if (unlikely(cpu >= 0))
1175 add_timer_on(timer, cpu);1176 add_timer_on(timer, cpu);