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cpufreq: Remove CPU hotplug callbacks only if they were initialized 

Since CPU hotplug callbacks are requested for CPUHP_AP_ONLINE_DYN state,
successful callback initialization will result in cpuhp_setup_state()
returning a positive value. Therefore acpi_cpufreq_online being zero
indicates that callbacks have not been installed.

This means that acpi_cpufreq_boost_exit() should only remove them if
acpi_cpufreq_online is positive. Trying to call
cpuhp_remove_state_nocalls(0) will cause a BUG().

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Boris Ostrovsky 2016-12-15 10:00:58 -05:00 committed by Rafael J. Wysocki
parent 1358e038fa
commit 2a8fa123d9
1 changed files with 1 additions and 1 deletions
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2
drivers/cpufreq/acpi-cpufreq.c
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@ -930,7 +930,7 @@ static void __init acpi_cpufreq_boost_init(void)
static void acpi_cpufreq_boost_exit(void)
{
if (acpi_cpufreq_online >= 0)
if (acpi_cpufreq_online > 0)
cpuhp_remove_state_nocalls(acpi_cpufreq_online);
}