tools/cpupower: fix error return value in cpupower_write_sysfs()

[ Upstream commit 57b100d4cf14276e0340eecb561005c07c129eb8 ]

The cpupower_write_sysfs() function currently returns -1 on
write failure, but the function signature indicates it should
return an unsigned int. Returning -1 from an unsigned function
results in a large positive value rather than indicating
an error condition.

Fix this by returning 0 on failure, which is more appropriate
for an unsigned return type and maintains consistency with typical
success/failure semantics where 0 indicates failure and non-zero
indicates success (bytes written).

Link: https://lore.kernel.org/r/20250828063000.803229-1-kaushlendra.kumar@intel.com
Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c
index 7a2ef691b20e1d12389b475753faa5edab4c142d..c2a7af89a67bb0d2f50c20c688ba137317452710 100644 (file)
--- a/tools/power/cpupower/lib/cpupower.c
+++ b/tools/power/cpupower/lib/cpupower.c
@@ -55,7 +55,7 @@ unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen)
        if (numwritten < 1) {
                perror(path);
                close(fd);
-               return -1;
+               return 0;
        }
 
        close(fd);