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cpufreq: cpufreq-cpu0: use RCU locks around usage of OPP
OPP pointer is RCU protected, hence after finding it, de-reference also should be protected with the same RCU context else the OPP pointer may become invalid. Reported-by: Jack Mitchell <jack@embed.me.uk> Tested-by: Alexander Holler <holler@ahsoftware.de> Tested-by: Jack Mitchell <jack@embed.me.uk> Acked-by: Alexander Holler <holler@ahsoftware.de> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -71,12 +71,15 @@ static int cpu0_set_target(struct cpufreq_policy *policy,
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}
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if (cpu_reg) {
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rcu_read_lock();
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opp = opp_find_freq_ceil(cpu_dev, &freq_Hz);
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if (IS_ERR(opp)) {
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rcu_read_unlock();
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pr_err("failed to find OPP for %ld\n", freq_Hz);
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return PTR_ERR(opp);
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}
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volt = opp_get_voltage(opp);
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rcu_read_unlock();
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tol = volt * voltage_tolerance / 100;
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volt_old = regulator_get_voltage(cpu_reg);
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}
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@ -236,12 +239,14 @@ static int cpu0_cpufreq_driver_init(void)
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*/
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for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
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;
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rcu_read_lock();
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opp = opp_find_freq_exact(cpu_dev,
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freq_table[0].frequency * 1000, true);
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min_uV = opp_get_voltage(opp);
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opp = opp_find_freq_exact(cpu_dev,
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freq_table[i-1].frequency * 1000, true);
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max_uV = opp_get_voltage(opp);
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rcu_read_unlock();
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ret = regulator_set_voltage_time(cpu_reg, min_uV, max_uV);
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if (ret > 0)
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transition_latency += ret * 1000;
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