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workqueue: make workqueue_lock irq-safe

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workqueue_lock will be used to synchronize areas which require
irq-safety and there isn't much benefit in keeping it not irq-safe.
Make it irq-safe.

This patch doesn't introduce any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This commit is contained in:
Tejun Heo 2013-03-12 11:29:57 -07:00
parent 6183c009f6
commit e98d5b16cf
1 changed files with 22 additions and 22 deletions
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44
kernel/workqueue.c
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@ -2715,10 +2715,10 @@ void drain_workqueue(struct workqueue_struct *wq)
* hotter than drain_workqueue() and already looks at @wq->flags.
* Use WQ_DRAINING so that queue doesn't have to check nr_drainers.
*/
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
if (!wq->nr_drainers++)
wq->flags |= WQ_DRAINING;
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
reflush:
flush_workqueue(wq);
@ -2740,10 +2740,10 @@ reflush:
goto reflush;
}
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
if (!--wq->nr_drainers)
wq->flags &= ~WQ_DRAINING;
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
}
EXPORT_SYMBOL_GPL(drain_workqueue);
@ -3233,7 +3233,7 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
* list. Grab it, set max_active accordingly and add the new
* workqueue to workqueues list.
*/
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
if (workqueue_freezing && wq->flags & WQ_FREEZABLE)
for_each_pwq_cpu(cpu, wq)
@ -3241,7 +3241,7 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
list_add(&wq->list, &workqueues);
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
return wq;
err:
@ -3285,9 +3285,9 @@ void destroy_workqueue(struct workqueue_struct *wq)
* wq list is used to freeze wq, remove from list after
* flushing is complete in case freeze races us.
*/
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
list_del(&wq->list);
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
if (wq->flags & WQ_RESCUER) {
kthread_stop(wq->rescuer->task);
@ -3336,7 +3336,7 @@ void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
max_active = wq_clamp_max_active(max_active, wq->flags, wq->name);
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
wq->saved_max_active = max_active;
@ -3344,16 +3344,16 @@ void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
struct pool_workqueue *pwq = get_pwq(cpu, wq);
struct worker_pool *pool = pwq->pool;
spin_lock_irq(&pool->lock);
spin_lock(&pool->lock);
if (!(wq->flags & WQ_FREEZABLE) ||
!(pool->flags & POOL_FREEZING))
pwq_set_max_active(pwq, max_active);
spin_unlock_irq(&pool->lock);
spin_unlock(&pool->lock);
}
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
}
EXPORT_SYMBOL_GPL(workqueue_set_max_active);
@ -3599,7 +3599,7 @@ void freeze_workqueues_begin(void)
{
unsigned int cpu;
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
WARN_ON_ONCE(workqueue_freezing);
workqueue_freezing = true;
@ -3609,7 +3609,7 @@ void freeze_workqueues_begin(void)
struct workqueue_struct *wq;
for_each_std_worker_pool(pool, cpu) {
spin_lock_irq(&pool->lock);
spin_lock(&pool->lock);
WARN_ON_ONCE(pool->flags & POOL_FREEZING);
pool->flags |= POOL_FREEZING;
@ -3622,11 +3622,11 @@ void freeze_workqueues_begin(void)
pwq->max_active = 0;
}
spin_unlock_irq(&pool->lock);
spin_unlock(&pool->lock);
}
}
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
}
/**
@ -3647,7 +3647,7 @@ bool freeze_workqueues_busy(void)
unsigned int cpu;
bool busy = false;
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
WARN_ON_ONCE(!workqueue_freezing);
@ -3671,7 +3671,7 @@ bool freeze_workqueues_busy(void)
}
}
out_unlock:
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
return busy;
}
@ -3688,7 +3688,7 @@ void thaw_workqueues(void)
{
unsigned int cpu;
spin_lock(&workqueue_lock);
spin_lock_irq(&workqueue_lock);
if (!workqueue_freezing)
goto out_unlock;
@ -3698,7 +3698,7 @@ void thaw_workqueues(void)
struct workqueue_struct *wq;
for_each_std_worker_pool(pool, cpu) {
spin_lock_irq(&pool->lock);
spin_lock(&pool->lock);
WARN_ON_ONCE(!(pool->flags & POOL_FREEZING));
pool->flags &= ~POOL_FREEZING;
@ -3716,13 +3716,13 @@ void thaw_workqueues(void)
wake_up_worker(pool);
spin_unlock_irq(&pool->lock);
spin_unlock(&pool->lock);
}
}
workqueue_freezing = false;
out_unlock:
spin_unlock(&workqueue_lock);
spin_unlock_irq(&workqueue_lock);
}
#endif /* CONFIG_FREEZER */