Implement the light-weight tear down helper to reduce the amount of work to do on CPU offline/online operation.
Signed-off-by: Viresh Kumar <[email protected]> --- drivers/cpufreq/cpufreq-dt.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c index 7ba392911cd0..69309a8121f0 100644 --- a/drivers/cpufreq/cpufreq-dt.c +++ b/drivers/cpufreq/cpufreq-dt.c @@ -160,6 +160,15 @@ static int cpufreq_init(struct cpufreq_policy *policy) const char *name; int ret; + /* + * We did light-weight shutdown earlier, nothing else to initialize here + * apart from policy->cpus. + */ + if (policy->driver_data) { + cpumask_copy(policy->cpus, policy->related_cpus); + return 0; + } + cpu_dev = get_cpu_device(policy->cpu); if (!cpu_dev) { pr_err("failed to get cpu%d device\n", policy->cpu); @@ -295,6 +304,15 @@ static int cpufreq_init(struct cpufreq_policy *policy) return ret; } +static int cpufreq_light_weight_exit(struct cpufreq_policy *policy) +{ + /* + * Preserve policy->driver_data and don't free resources on light-weight + * tear down. + */ + return 0; +} + static int cpufreq_exit(struct cpufreq_policy *policy) { struct private_data *priv = policy->driver_data; @@ -319,6 +337,7 @@ static struct cpufreq_driver dt_cpufreq_driver = { .get = cpufreq_generic_get, .init = cpufreq_init, .exit = cpufreq_exit, + .light_weight_exit = cpufreq_light_weight_exit, .name = "cpufreq-dt", .attr = cpufreq_dt_attr, .suspend = cpufreq_generic_suspend, -- 2.20.1.321.g9e740568ce00
