On 12/5/23 19:54, Rafael J. Wysocki wrote:
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!
Thank you Rafael!
