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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 <viresh.kumar@linaro.org>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> [Devfreq]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
2017-01-23 10:11:47 +05:30
committed by Rafael J. Wysocki
parent 7034764a1e
commit 8a31d9d942
15 changed files with 112 additions and 155 deletions
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16
drivers/devfreq/rk3399_dmc.c
View File

@@ -91,17 +91,13 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
unsigned long target_volt, target_rate;
int err;
rcu_read_lock();
opp = devfreq_recommended_opp(dev, freq, flags);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
target_rate = dev_pm_opp_get_freq(opp);
target_volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
if (dmcfreq->rate == target_rate)
return 0;
@@ -422,15 +418,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
data->rate = clk_get_rate(data->dmc_clk);
rcu_read_lock();
opp = devfreq_recommended_opp(dev, &data->rate, 0);
if (IS_ERR(opp)) {
rcu_read_unlock();
if (IS_ERR(opp))
return PTR_ERR(opp);
}
data->rate = dev_pm_opp_get_freq(opp);
data->volt = dev_pm_opp_get_voltage(opp);
rcu_read_unlock();
dev_pm_opp_put(opp);
rk3399_devfreq_dmc_profile.initial_freq = data->rate;