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cpufreq: Disallow ->resolve_freq() for drivers providing ->target_index()

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The handlers provided by cpufreq core are sufficient for resolving the
frequency for drivers providing ->target_index(), as the core already
has the frequency table and so ->resolve_freq() isn't required for such
platforms.

This patch disallows drivers with ->target_index() callback to use the
->resolve_freq() callback.

Also, it fixes a potential kernel crash for drivers providing ->target()
but no ->resolve_freq().

Fixes: e3c0623608 "cpufreq: add cpufreq_driver_resolve_freq()"
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2016-07-21 14:39:26 -07:00 committed by Rafael J. Wysocki
parent 5b6667c76d
commit abe8bd024e
1 changed files with 12 additions and 4 deletions
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16
drivers/cpufreq/cpufreq.c
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@ -507,12 +507,20 @@ unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
{
target_freq = clamp_val(target_freq, policy->min, policy->max);
policy->cached_target_freq = target_freq;
if (cpufreq_driver->target_index) {
int idx;
idx = cpufreq_frequency_table_target(policy, target_freq,
CPUFREQ_RELATION_L);
policy->cached_resolved_idx = idx;
return policy->freq_table[idx].frequency;
}
if (cpufreq_driver->resolve_freq)
return cpufreq_driver->resolve_freq(policy, target_freq);
policy->cached_resolved_idx =
cpufreq_frequency_table_target(policy, target_freq,
CPUFREQ_RELATION_L);
return policy->freq_table[policy->cached_resolved_idx].frequency;
return target_freq;
}
/*********************************************************************