When the kernel is configured with CONFIG_CPU_IDLE_MULTIPLE_DRIVERS, the cpuidle directory contains a "driver" subdirectory that confuses the current code parsing the C states on ARM platforms, ending up with a C state entry corresponding to the actual driver name instead of a proper C state entry. This patch fixes the code by stopping the parsing if the files that characterise the C states (ie usage) are not found in the respective: /sys/devices/system/cpu/cpuX/cpuidle subdirectory containing C states information. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi(a)arm.com&gt; Tested-by: Kevin Hilman <khilman(a)linaro.org&gt; --- src/cpu/cpu_linux.cpp | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/cpu/cpu_linux.cpp b/src/cpu/cpu_linux.cpp index e1ff165..78fd2d3 100644 --- a/src/cpu/cpu_linux.cpp +++ b/src/cpu/cpu_linux.cpp @@ -83,7 +83,8 @@ void cpu_linux::parse_cstates_start(void) if (file) { file >> usage; file.close(); - } + } else + continue; sprintf(filename + len, "/%s/time", entry->d_name); @@ -172,7 +173,8 @@ void cpu_linux::parse_cstates_end(void) if (file) { file >> usage; file.close(); - } + } else + continue; sprintf(filename + len, "/%s/time", entry->d_name); -- 2.1.2