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authorSteffen Klassert <steffen.klassert@secunet.com>2010-05-19 13:43:46 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2010-05-19 13:43:46 +1000
commit2b73b07ab8a44ce171e07a328439f311481a7ea7 (patch)
tree0a050dbe8eca78e1a8efff9b023e192c1f11633f /kernel/padata.c
parentd46a5ac7a7e2045e33c6ad6ffb8cf18a7e86a15a (diff)
padata: Flush the padata queues actively
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>
Diffstat (limited to 'kernel/padata.c')
-rw-r--r--kernel/padata.c33
1 files changed, 25 insertions, 8 deletions
diff --git a/kernel/padata.c b/kernel/padata.c
index 6d7ea481b71..ec6b8b7cf95 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -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);