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cpufreq: Limit resolving a frequency to policy min/max

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[ Upstream commit d394abcb12bb1a6f309c1221fdb8e73594ecf1b4 ]

Resolving a frequency to an efficient one should not transgress
policy->max (which can be set for thermal reason) and policy->min.

Currently, there is possibility where scaling_cur_freq can exceed
scaling_max_freq when scaling_max_freq is an inefficient frequency.

Add a check to ensure that resolving a frequency will respect
policy->min/max.

Cc: All applicable <stable@vger.kernel.org>
Fixes: 1f39fa0dccff ("cpufreq: Introducing CPUFREQ_RELATION_E")
Signed-off-by: Shivnandan Kumar <quic_kshivnan@quicinc.com>
[ rjw: Whitespace adjustment, changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shivnandan Kumar 2024-02-27 14:43:51 +05:30 committed by Greg Kroah-Hartman
parent 66e2c41b0c
commit ed87a42375
1 changed files with 14 additions and 1 deletions
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15
include/linux/cpufreq.h
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@ -1021,6 +1021,18 @@ static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
efficiencies);
}
static inline bool cpufreq_is_in_limits(struct cpufreq_policy *policy, int idx)
{
unsigned int freq;
if (idx < 0)
return false;
freq = policy->freq_table[idx].frequency;
return freq == clamp_val(freq, policy->min, policy->max);
}
static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
@ -1054,7 +1066,8 @@ retry:
return 0;
}
if (idx < 0 && efficiencies) {
/* Limit frequency index to honor policy->min/max */
if (!cpufreq_is_in_limits(policy, idx) && efficiencies) {
efficiencies = false;
goto retry;
}