• Rafael J. Wysocki's avatar
    cpuidle: Fix cpuidle_driver_state_disabled() · b0142d66
    Rafael J. Wysocki authored
    It turns out that cpuidle_driver_state_disabled() can be called
    before registering the cpufreq driver on some platforms, which
    was not expected when it was introduced and which leads to a NULL
    pointer dereference when trying to walk the CPUs associated with
    the given cpuidle driver.
    
    Fix the problem by making cpuidle_driver_state_disabled() check if
    the driver's mask of CPUs associated with it is present and to set
    CPUIDLE_FLAG_UNUSABLE for the given idle state in the driver's states
    list if that is not the case to cause __cpuidle_register_device() to
    set CPUIDLE_STATE_DISABLED_BY_DRIVER for that state for all cpuidle
    devices registered by it later.
    
    Fixes: cbda56d5 ("cpuidle: Introduce cpuidle_driver_state_disabled() for driver quirks")
    Reported-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
    Tested-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    b0142d66
driver.c 10.4 KB