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Commit ee836555 authored by Steffen Klassert's avatar Steffen Klassert Committed by Herbert Xu
Browse files

padata: Block until the instance is unused on stop 



This patch makes padata_stop to block until the padata
instance is unused. Also we split padata_stop to a locked
and a unlocked version. This is in preparation to be able
to change the cpumask after a call to patata stop.

Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 4c879170

kernel/padata.c

+16 −8
Original line number Diff line number Diff line
@@ -490,6 +490,20 @@ static void __padata_start(struct padata_instance *pinst) 
	pinst->flags |= PADATA_INIT;

}



static void __padata_stop(struct padata_instance *pinst)

{

	if (!(pinst->flags & PADATA_INIT))

		return;



	pinst->flags &= ~PADATA_INIT;



	synchronize_rcu();



	get_online_cpus();

	padata_flush_queues(pinst->pd);

	put_online_cpus();

}



/* Replace the internal control stucture with a new one. */

static void padata_replace(struct padata_instance *pinst,

			   struct parallel_data *pd_new)
@@ -649,7 +663,7 @@ EXPORT_SYMBOL(padata_start); 
void padata_stop(struct padata_instance *pinst)

{

	mutex_lock(&pinst->lock);

	pinst->flags &= ~PADATA_INIT;

	__padata_stop(pinst);

	mutex_unlock(&pinst->lock);

}

EXPORT_SYMBOL(padata_stop);
@@ -770,17 +784,11 @@ EXPORT_SYMBOL(padata_alloc); 
 */

void padata_free(struct padata_instance *pinst)

{

	padata_stop(pinst);



	synchronize_rcu();



#ifdef CONFIG_HOTPLUG_CPU

	unregister_hotcpu_notifier(&pinst->cpu_notifier);

#endif

	get_online_cpus();

	padata_flush_queues(pinst->pd);

	put_online_cpus();



	padata_stop(pinst);

	padata_free_pd(pinst->pd);

	free_cpumask_var(pinst->cpumask);

	kfree(pinst);