This is a note to let you know that I've just added the patch titled
powercap: DTPM: Fix missing cpufreq_cpu_put() calls
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powercap-dtpm-fix-missing-cpufreq_cpu_put-calls.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bdefd9913bdd453991ef756b6f7176e8ad80d786 Mon Sep 17 00:00:00 2001
From: Lukasz Luba <lukasz.luba@xxxxxxx>
Date: Fri, 1 Dec 2023 12:32:05 +0000
Subject: powercap: DTPM: Fix missing cpufreq_cpu_put() calls
From: Lukasz Luba <lukasz.luba@xxxxxxx>
commit bdefd9913bdd453991ef756b6f7176e8ad80d786 upstream.
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: v5.16+ <stable@xxxxxxxxxxxxxxx> # v5.16+
Signed-off-by: Lukasz Luba <lukasz.luba@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/powercap/dtpm_cpu.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
--- a/drivers/powercap/dtpm_cpu.c
+++ b/drivers/powercap/dtpm_cpu.c
@@ -140,6 +140,8 @@ 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);
@@ -191,12 +193,16 @@ static int __dtpm_cpu_setup(int cpu, str
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;
@@ -216,6 +222,7 @@ static int __dtpm_cpu_setup(int cpu, str
if (ret)
goto out_dtpm_unregister;
+ cpufreq_cpu_put(policy);
return 0;
out_dtpm_unregister:
@@ -227,6 +234,8 @@ out_kfree_dtpm_cpu:
per_cpu(dtpm_per_cpu, cpu) = NULL;
kfree(dtpm_cpu);
+release_policy:
+ cpufreq_cpu_put(policy);
return ret;
}
Patches currently in stable-queue which might be from lukasz.luba@xxxxxxx are
queue-6.6/powercap-dtpm-fix-missing-cpufreq_cpu_put-calls.patch
