Commit 0a10d3fe authored by Ionela Voinescu's avatar Ionela Voinescu Committed by Rafael J. Wysocki
Browse files

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: default avatarIonela Voinescu <ionela.voinescu@arm.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 856deb86

drivers/base/arch_topology.c

+3 −0
Original line number Diff line number Diff line
@@ -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.