tools/power cpupower: Reset errno before strtoull()

cpuidle_state_get_one_value() never cleared errno before calling
strtoull(), so a prior ERANGE caused every cpuidle counter read to
return zero. Reset errno to 0 before the conversion so each sysfs read
is evaluated independently.

Link: https://lore.kernel.org/r/20251201121745.3776703-1-kaushlendra.kumar@intel.com
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/power/cpupower/lib/cpuidle.c b/tools/power/cpupower/lib/cpuidle.c
index 6a881d93d2e991b7aea0b03abf64ab92a4772728..2fcb343d8e757a6f3e1072847b6703a8347d5dc5 100644 (file)
--- a/tools/power/cpupower/lib/cpuidle.c
+++ b/tools/power/cpupower/lib/cpuidle.c
@@ -150,6 +150,7 @@ unsigned long long cpuidle_state_get_one_value(unsigned int cpu,
        if (len == 0)
                return 0;
 
+       errno = 0;
        value = strtoull(linebuf, &endp, 0);
 
        if (endp == linebuf || errno == ERANGE)