On Fri, Dec 1, 2023 at 1:31 PM Lukasz Luba <lukasz.luba@xxxxxxx> wrote:
>
> The policy returned by cpufreq_cpu_get() has to be released with
> the help of cpufreq_cpu_put() to balance its kobject reference counter
> properly.
>
> Add the missing calls to cpufreq_cpu_put() in the code.
>
> Fixes: 0aea2e4ec2a2 ("powercap/dtpm_cpu: Reset per_cpu variable in the release function")
> Fixes: 0e8f68d7f048 ("powercap/drivers/dtpm: Add CPU energy model based support")
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.10+
> Signed-off-by: Lukasz Luba <lukasz.luba@xxxxxxx>
> ---
> drivers/powercap/dtpm_cpu.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/powercap/dtpm_cpu.c b/drivers/powercap/dtpm_cpu.c
> index 45bb7e2849d7..aac278e162d9 100644
> --- a/drivers/powercap/dtpm_cpu.c
> +++ b/drivers/powercap/dtpm_cpu.c
> @@ -152,6 +152,8 @@ static void pd_release(struct dtpm *dtpm)
> if (policy) {
> for_each_cpu(dtpm_cpu->cpu, policy->related_cpus)
> per_cpu(dtpm_per_cpu, dtpm_cpu->cpu) = NULL;
> +
> + cpufreq_cpu_put(policy);
> }
>
> kfree(dtpm_cpu);
> @@ -204,12 +206,16 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
> return 0;
>
> pd = em_cpu_get(cpu);
> - if (!pd || em_is_artificial(pd))
> - return -EINVAL;
> + if (!pd || em_is_artificial(pd)) {
> + ret = -EINVAL;
> + goto release_policy;
> + }
>
> dtpm_cpu = kzalloc(sizeof(*dtpm_cpu), GFP_KERNEL);
> - if (!dtpm_cpu)
> - return -ENOMEM;
> + if (!dtpm_cpu) {
> + ret = -ENOMEM;
> + goto release_policy;
> + }
>
> dtpm_init(&dtpm_cpu->dtpm, &dtpm_ops);
> dtpm_cpu->cpu = cpu;
> @@ -231,6 +237,7 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
> if (ret)
> goto out_dtpm_unregister;
>
> + cpufreq_cpu_put(policy);
> return 0;
>
> out_dtpm_unregister:
> @@ -242,6 +249,8 @@ static int __dtpm_cpu_setup(int cpu, struct dtpm *parent)
> per_cpu(dtpm_per_cpu, cpu) = NULL;
> kfree(dtpm_cpu);
>
> +release_policy:
> + cpufreq_cpu_put(policy);
> return ret;
> }
>
> --
Applied as 6.7-rc material with the Cc: stable tag fixed.
Thanks!
