acpi-cpufreq: De-register CPU notifier and free struct msr on error.

If cpufreq_register_driver() fails we would free the acpi driver
related structures but not free the ones allocated
by acpi_cpufreq_boost_init() function. This meant that as
the driver error-ed out and a CPU online/offline event came
we would crash and burn as one of the CPU notifiers would point
to garbage.

Fixes: cfc9c8ed03e4 (acpi-cpufreq: Adjust the code to use the common boost attribute)
Acked-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 79e5608..18448a7 100644 (file)
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -919,7 +919,7 @@ static void __init acpi_cpufreq_boost_init(void)
        }
 }
 
-static void __exit acpi_cpufreq_boost_exit(void)
+static void acpi_cpufreq_boost_exit(void)
 {
        if (msrs) {
                unregister_cpu_notifier(&boost_nb);
@@ -969,9 +969,10 @@ static int __init acpi_cpufreq_init(void)
        acpi_cpufreq_boost_init();
 
        ret = cpufreq_register_driver(&acpi_cpufreq_driver);
-       if (ret)
+       if (ret) {
                free_acpi_perf_data();
-
+               acpi_cpufreq_boost_exit();
+       }
        return ret;
 }