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 <[email protected]>
---
 kernel/padata.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kernel/padata.c b/kernel/padata.c
index 629bef3..1f40560 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -763,7 +763,10 @@ void padata_free(struct padata_instance *pinst)
 #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);
-- 
1.5.6.5

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