cpufreq: CPPC: Avoid overflow when calculating desired_perf

This patch fixes overflow issue when calculating the desired_perf.

Fixes: ad38677df44b (cpufreq: CPPC: Force reporting values in KHz to fix user space interface)
Signed-off-by: Hoan Tran <hotran@apm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 6debc189a9c944aa8b7077b21c374cb8f67ecd6a..99db4227ae38785bbaf2d59fd506ed0f96a4dece 100644 (file)
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -84,7 +84,7 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
 
        cpu = all_cpu_data[policy->cpu];
 
-       cpu->perf_ctrls.desired_perf = target_freq * policy->max / cppc_dmi_max_khz;
+       cpu->perf_ctrls.desired_perf = (u64)target_freq * policy->max / cppc_dmi_max_khz;
        freqs.old = policy->cur;
        freqs.new = target_freq;