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Date: Wed, 6 Apr 2016 17:00:51 -0400 From: Len Brown <lenb@...nel.org> To: linux-pm@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Richard Cochran <rcochran@...utronix.de>, Len Brown <len.brown@...el.com> Subject: [PATCH 05/13] intel_idle: Fix deallocation order on the driver exit path. From: Richard Cochran <rcochran@...utronix.de> In the module_exit() method, this driver first frees its per-CPU pointer, then unregisters a callback making use of the pointer. Furthermore, the function, intel_idle_cpuidle_devices_uninit, is racy against CPU hot plugging as it calls for_each_online_cpu(). This patch corrects the issues by unregistering first on the exit path while holding the hot plug lock. Signed-off-by: Richard Cochran <rcochran@...utronix.de> Signed-off-by: Len Brown <len.brown@...el.com> --- drivers/idle/intel_idle.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index c50859d..5b309e5 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -1379,16 +1379,16 @@ static int __init intel_idle_init(void) static void __exit intel_idle_exit(void) { - intel_idle_cpuidle_devices_uninit(); - cpuidle_unregister_driver(&intel_idle_driver); - cpu_notifier_register_begin(); if (lapic_timer_reliable_states != LAPIC_TIMER_ALWAYS_RELIABLE) on_each_cpu(__setup_broadcast_timer, (void *)false, 1); __unregister_cpu_notifier(&cpu_hotplug_notifier); + intel_idle_cpuidle_devices_uninit(); cpu_notifier_register_done(); + + cpuidle_unregister_driver(&intel_idle_driver); } module_init(intel_idle_init); -- 2.8.0.rc4.16.g56331f8
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