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| author | Chen Yu <yu.c.chen@intel.com> | 2015-09-09 18:27:31 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-09-09 22:55:23 +0200 |
| commit | 43717aadd2bc87fb10fbf1cd815c1cbae9bb95b3 (patch) | |
| tree | a525f784c4a857f55c09d6dc8eee594ea042cffb /drivers/cpufreq/sa1110-cpufreq.c | |
| parent | 953ba9ff77f3d08635712eaeffb218d46889b58a (diff) | |
intel_pstate: Fix user input of min/max to legal policy region
In current code, max_perf_pct might be smaller than min_perf_pct
by improper user input:
$ grep . /sys/devices/system/cpu/intel_pstate/m*_perf_pct
/sys/devices/system/cpu/intel_pstate/max_perf_pct:100
/sys/devices/system/cpu/intel_pstate/min_perf_pct:100
$ echo 80 > /sys/devices/system/cpu/intel_pstate/max_perf_pct
$ grep . /sys/devices/system/cpu/intel_pstate/m*_perf_pct
/sys/devices/system/cpu/intel_pstate/max_perf_pct:80
/sys/devices/system/cpu/intel_pstate/min_perf_pct:100
Fix this problem by 2 steps:
1. Normalize the user input to [min_policy, max_policy].
2. Make sure max_perf_pct>=min_perf_pct, suggested by Seiichi Ikarashi.
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/sa1110-cpufreq.c')
0 files changed, 0 insertions, 0 deletions