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    Subject[PATCH AUTOSEL for 4.9 100/100] cpuidle: fix broadcast control when broadcast can not be entered
    Date
    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>
    ---
    drivers/cpuidle/cpuidle.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
    index c73207abb5a4..35237c8d5206 100644
    --- a/drivers/cpuidle/cpuidle.c
    +++ b/drivers/cpuidle/cpuidle.c
    @@ -189,6 +189,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
    return -EBUSY;
    }
    target_state = &drv->states[index];
    + broadcast = false;
    }

    /* Take note of the planned idle state. */
    --
    2.11.0
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