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PM / OPP: Update OPP users to put reference

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This patch updates dev_pm_opp_find_freq_*() routines to get a reference
to the OPPs returned by them.

Also updates the users of dev_pm_opp_find_freq_*() routines to call
dev_pm_opp_put() after they are done using the OPPs.

As it is guaranteed the that OPPs wouldn't get freed while being used,
the RCU read side locking present with the users isn't required anymore.
Drop it as well.

This patch also updates all users of devfreq_recommended_opp() which was
returning an OPP received from the OPP core.

Note that some of the OPP core routines have gained
rcu_read_{lock|unlock}() calls, as those still use RCU specific APIs
within them.

Signed-off-by: Viresh Kumar <[email protected]>
Reviewed-by: Chanwoo Choi <[email protected]> [Devfreq]
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Viresh Kumar 2017-01-23 10:11:47 +05:30 • committed by Rafael J. Wysocki
commit 8a31d9d942
15 changed files with 110 additions and 153 deletions
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11
drivers/thermal/cpu_cooling.c
View file

@ -297,8 +297,6 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
if (!power_table)
return -ENOMEM;
rcu_read_lock();
for (freq = 0, i = 0;
opp = dev_pm_opp_find_freq_ceil(dev, &freq), !IS_ERR(opp);
freq++, i++) {
@ -306,13 +304,13 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
u64 power;
if (i >= num_opps) {
rcu_read_unlock();
ret = -EAGAIN;
goto free_power_table;
}
freq_mhz = freq / 1000000;
voltage_mv = dev_pm_opp_get_voltage(opp) / 1000;
dev_pm_opp_put(opp);
/*
* Do the multiplication with MHz and millivolt so as
@ -328,8 +326,6 @@ static int build_dyn_power_table(struct cpufreq_cooling_device *cpufreq_device,
power_table[i].power = power;
}
rcu_read_unlock();
if (i != num_opps) {
ret = PTR_ERR(opp);
goto free_power_table;
@ -433,13 +429,10 @@ static int get_static_power(struct cpufreq_cooling_device *cpufreq_device,
return 0;
}
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(cpufreq_device->cpu_dev, freq_hz,
true);
voltage = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(cpufreq_device->cpu_dev,

15
drivers/thermal/devfreq_cooling.c
View file

@ -113,15 +113,15 @@ static int partition_enable_opps(struct devfreq_cooling_device *dfc,
unsigned int freq = dfc->freq_table[i];
bool want_enable = i >= cdev_state ? true : false;
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, freq, !want_enable);
rcu_read_unlock();
if (PTR_ERR(opp) == -ERANGE)
continue;
else if (IS_ERR(opp))
return PTR_ERR(opp);
dev_pm_opp_put(opp);
if (want_enable)
ret = dev_pm_opp_enable(dev, freq);
else
@ -221,15 +221,12 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
if (!dfc->power_ops->get_static_power)
return 0;
rcu_read_lock();
opp = dev_pm_opp_find_freq_exact(dev, freq, true);
if (IS_ERR(opp) && (PTR_ERR(opp) == -ERANGE))
opp = dev_pm_opp_find_freq_exact(dev, freq, false);
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
rcu_read_unlock();
dev_pm_opp_put(opp);
if (voltage == 0) {
dev_warn_ratelimited(dev,
@ -412,18 +409,14 @@ static int devfreq_cooling_gen_tables(struct devfreq_cooling_device *dfc)
unsigned long power_dyn, voltage;
struct dev_pm_opp *opp;
rcu_read_lock();
opp = dev_pm_opp_find_freq_floor(dev, &freq);
if (IS_ERR(opp)) {
rcu_read_unlock();
ret = PTR_ERR(opp);
goto free_tables;
}
voltage = dev_pm_opp_get_voltage(opp) / 1000; /* mV */
rcu_read_unlock();
dev_pm_opp_put(opp);
if (dfc->power_ops) {
power_dyn = get_dynamic_power(dfc, freq, voltage);