4.9-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Piggin npiggin@gmail.com
[ Upstream commit f187851b9b4a76952b1158b86434563dd2031103 ]
When failing to enter broadcast timer mode for an idle state that requires it, a new state is selected that does not require broadcast, but the broadcast variable remains set. This causes tick_broadcast_exit to be called despite not having entered broadcast mode.
This causes the WARN_ON_ONCE(!irqs_disabled()) to trigger in some cases. It does not appear to cause problems for code today, but seems to violate the interface so should be fixed.
Signed-off-by: Nicholas Piggin npiggin@gmail.com Reviewed-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpuidle/cpuidle.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -189,6 +189,7 @@ int cpuidle_enter_state(struct cpuidle_d return -EBUSY; } target_state = &drv->states[index]; + broadcast = false; }
/* Take note of the planned idle state. */