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cpufreq: Fix policy initialization for internal governor drivers

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commit f5739cb0b56590d68d8df8a44659893b6d0084c3 upstream.

Before commit 1e4f63aecb53 ("cpufreq: Avoid creating excessively
large stack frames") the initial value of the policy field in struct
cpufreq_policy set by the driver's ->init() callback was implicitly
passed from cpufreq_init_policy() to cpufreq_set_policy() if the
default governor was neither "performance" nor "powersave".  After
that commit, however, cpufreq_init_policy() must take that case into
consideration explicitly and handle it as appropriate, so make that
happen.

Fixes: 1e4f63aecb53 ("cpufreq: Avoid creating excessively large stack frames")
Link: https://lore.kernel.org/linux-pm/[email protected]/
Reported-by: Artem Bityutskiy <[email protected]>
Cc: 5.4+ <[email protected]> # 5.4+
Signed-off-by: Rafael J. Wysocki <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Rafael J. Wysocki 2020-02-26 22:39:27 +01:00 • committed by Greg Kroah-Hartman
commit 9629f47d7d
1 changed files with 10 additions and 2 deletions
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12
drivers/cpufreq/cpufreq.c
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@ -1071,9 +1071,17 @@ static int cpufreq_init_policy(struct cpufreq_policy *policy)
pol = policy->last_policy;
} else if (def_gov) {
pol = cpufreq_parse_policy(def_gov->name);
} else {
return -ENODATA;
/*
* In case the default governor is neiter "performance"
* nor "powersave", fall back to the initial policy
* value set by the driver.
*/
if (pol == CPUFREQ_POLICY_UNKNOWN)
pol = policy->policy;
}
if (pol != CPUFREQ_POLICY_PERFORMANCE &&
pol != CPUFREQ_POLICY_POWERSAVE)
return -ENODATA;
}
return cpufreq_set_policy(policy, gov, pol);