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| author | Tero Kristo <tero.kristo@linux.intel.com> | 2023-06-21 09:58:39 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-06-21 19:42:58 +0200 |
| commit | 03f44ffb3d5be2fceda375d92c70ab6de4df7081 (patch) | |
| tree | bf30dcd4266a938935105c0649ecb0b43e49c87d /drivers/cpufreq | |
| parent | c88ad30e3f861c7be4e3b4995554e2b0754059b7 (diff) | |
| download | linux-03f44ffb3d5be2fceda375d92c70ab6de4df7081.tar.gz | |
cpufreq: intel_pstate: Fix energy_performance_preference for passive
If the intel_pstate driver is set to passive mode, then writing the
same value to the energy_performance_preference sysfs twice will fail.
This is caused by the wrong return value used (index of the matched
energy_perf_string), instead of the length of the passed in parameter.
Fix by forcing the internal return value to zero when the same
preference is passed in by user. This same issue is not present when
active mode is used for the driver.
Fixes: f6ebbcf08f37 ("cpufreq: intel_pstate: Implement passive mode with HWP enabled")
Reported-by: Niklas Neronin <niklas.neronin@intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2548ec92faa28..f29182512b982 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -824,6 +824,8 @@ static ssize_t store_energy_performance_preference( err = cpufreq_start_governor(policy); if (!ret) ret = err; + } else { + ret = 0; } } |