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padata: Flush the padata queues actively

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yield was used to wait until all references of the internal control
structure in use are dropped before it is freed. This patch implements
padata_flush_queues which actively flushes the padata percpu queues
in this case.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Steffen Klassert 2010-05-19 13:43:46 +10:00 committed by Herbert Xu
parent d46a5ac7a7
commit 2b73b07ab8
1 changed files with 25 additions and 8 deletions
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33
kernel/padata.c
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@ -417,6 +417,29 @@ static void padata_free_pd(struct parallel_data *pd)
kfree(pd);
}
static void padata_flush_queues(struct parallel_data *pd)
{
int cpu;
struct padata_queue *queue;
for_each_cpu(cpu, pd->cpumask) {
queue = per_cpu_ptr(pd->queue, cpu);
flush_work(&queue->pwork);
}
del_timer_sync(&pd->timer);
if (atomic_read(&pd->reorder_objects))
padata_reorder(pd);
for_each_cpu(cpu, pd->cpumask) {
queue = per_cpu_ptr(pd->queue, cpu);
flush_work(&queue->swork);
}
BUG_ON(atomic_read(&pd->refcnt) != 0);
}
static void padata_replace(struct padata_instance *pinst,
struct parallel_data *pd_new)
{
@ -428,11 +451,7 @@ static void padata_replace(struct padata_instance *pinst,
synchronize_rcu();
while (atomic_read(&pd_old->refcnt) != 0)
yield();
flush_workqueue(pinst->wq);
padata_flush_queues(pd_old);
padata_free_pd(pd_old);
pinst->flags &= ~PADATA_RESET;
@ -695,12 +714,10 @@ void padata_free(struct padata_instance *pinst)
synchronize_rcu();
while (atomic_read(&pinst->pd->refcnt) != 0)
yield();
#ifdef CONFIG_HOTPLUG_CPU
unregister_hotcpu_notifier(&pinst->cpu_notifier);
#endif
padata_flush_queues(pinst->pd);
padata_free_pd(pinst->pd);
free_cpumask_var(pinst->cpumask);
kfree(pinst);