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cpupower: fix how "cpupower frequency-info" interprets latency

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the intel-pstate driver does not support the ondemand governor and does not
have a valid value in
/sys/devices/system/cpu/cpu[x]/cpufreq/cpuinfo_transition_latency. The
intel-pstate driver sets cpuinfo_transition_latency to CPUFREQ_ETERNAL (-1),
the value written into cpuinfo_transition_latency is defind as an unsigned
int so checking the read value against max unsigned int will determine if the
value is valid.

Signed-off-by: Jacob Tanenbaum <[email protected]>
Signed-off-by: Thomas Renninger <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Jacob Tanenbaum authored and Rafael J. Wysocki committed 2015-12-03 02:30:30 +01:00
1 parent 562e5f1a35
commit e98f033f94
1 file changed
+2 -2
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tools/power/cpupower/utils/cpufreq-info.c
+2 -2
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@@ -434,8 +434,8 @@ static int get_latency(unsigned int cpu, unsigned int human)
unsigned long latency = cpufreq_get_transition_latency(cpu);
printf(_(" maximum transition latency: "));
if (!latency) {
printf(_(" Cannot determine latency.\n"));
if (!latency || latency == UINT_MAX) {
printf(_(" Cannot determine or is not supported.\n"));
return -EINVAL;
}