padata: Use get_online_cpus/put_online_cpus in padata_free
Add get_online_cpus/put_online_cpus to ensure that no cpu goes
offline during the flushing of the padata percpu queues.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/kernel/padata.c b/kernel/padata.c
index ca89dfb..b1c9857 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -763,7 +763,10 @@
#ifdef CONFIG_HOTPLUG_CPU
unregister_hotcpu_notifier(&pinst->cpu_notifier);
#endif
+ get_online_cpus();
padata_flush_queues(pinst->pd);
+ put_online_cpus();
+
padata_free_pd(pinst->pd);
free_cpumask_var(pinst->cpumask);
kfree(pinst);
