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arch_topology: validate input frequencies to arch_set_freq_scale() 

The current frequency passed to arch_set_freq_scale() could end up
being 0, signaling an error in setting a new frequency. Also, if the
maximum frequency in 0, this will result in a division by 0 error.

Therefore, validate these input values before using them for the
setting of the frequency scale factor.

Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ionela Voinescu 2020-09-01 21:55:45 +01:00 committed by Rafael J. Wysocki
parent 856deb866d
commit 0a10d3fe3e
1 changed files with 3 additions and 0 deletions
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3
drivers/base/arch_topology.c
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@ -33,6 +33,9 @@ void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
unsigned long scale;
int i;
if (WARN_ON_ONCE(!cur_freq || !max_freq))
return;
/*
* If the use of counters for FIE is enabled, just return as we don't
* want to update the scale factor with information from CPUFREQ.