From: Viresh Kumar viresh.kumar@linaro.org
[ Upstream commit 51c99dd2c06b234575661fa1e0a1dea6c3ef566f ]
We can not call dev_pm_opp_of_cpumask_remove_table() freely anymore since the latest OPP core updates as that uses reference counting to free resources. There are cases where no static OPPs are added (using DT) for a platform and trying to remove the OPP table may end up decrementing refcount which is already zero and hence generating warnings.
Lets track if we were able to add static OPPs or not and then only remove the table based on that. Some reshuffling of code is also done to do that.
Reported-by: Niklas Cassel niklas.cassel@linaro.org Tested-by: Niklas Cassel niklas.cassel@linaro.org Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/cpufreq/cpufreq-dt.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-)
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c index 4d3ec92cbabf..1496617b05d5 100644 --- a/drivers/cpufreq/cpufreq-dt.c +++ b/drivers/cpufreq/cpufreq-dt.c @@ -32,6 +32,7 @@ struct private_data { struct device *cpu_dev; struct thermal_cooling_device *cdev; const char *reg_name; + bool have_static_opps; };
static struct freq_attr *cpufreq_dt_attr[] = { @@ -197,6 +198,15 @@ static int cpufreq_init(struct cpufreq_policy *policy) } }
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) { + ret = -ENOMEM; + goto out_put_regulator; + } + + priv->reg_name = name; + priv->opp_table = opp_table; + /* * Initialize OPP tables for all policy->cpus. They will be shared by * all CPUs which have marked their CPUs shared with OPP bindings. @@ -207,7 +217,8 @@ static int cpufreq_init(struct cpufreq_policy *policy) * * OPPs might be populated at runtime, don't check for error here */ - dev_pm_opp_of_cpumask_add_table(policy->cpus); + if (!dev_pm_opp_of_cpumask_add_table(policy->cpus)) + priv->have_static_opps = true;
/* * But we need OPP table to function so if it is not there let's @@ -233,19 +244,10 @@ static int cpufreq_init(struct cpufreq_policy *policy) __func__, ret); }
- priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (!priv) { - ret = -ENOMEM; - goto out_free_opp; - } - - priv->reg_name = name; - priv->opp_table = opp_table; - ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table); if (ret) { dev_err(cpu_dev, "failed to init cpufreq table: %d\n", ret); - goto out_free_priv; + goto out_free_opp; }
priv->cpu_dev = cpu_dev; @@ -284,10 +286,11 @@ static int cpufreq_init(struct cpufreq_policy *policy)
out_free_cpufreq_table: dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table); -out_free_priv: - kfree(priv); out_free_opp: - dev_pm_opp_of_cpumask_remove_table(policy->cpus); + if (priv->have_static_opps) + dev_pm_opp_of_cpumask_remove_table(policy->cpus); + kfree(priv); +out_put_regulator: if (name) dev_pm_opp_put_regulator(opp_table); out_put_clk: @@ -302,7 +305,8 @@ static int cpufreq_exit(struct cpufreq_policy *policy)
cpufreq_cooling_unregister(priv->cdev); dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); - dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); + if (priv->have_static_opps) + dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); if (priv->reg_name) dev_pm_opp_put_regulator(priv->opp_table);