cpufreq: intel_pstate: fix pstate limits enforcement for adjust_perf …

…call back

There is a loophole in pstate limit clamping for the intel_cpufreq CPU
frequency scaling driver (intel_pstate in passive mode), schedutil CPU
frequency scaling governor, HWP (HardWare Pstate) control enabled, when
the adjust_perf call back path is used.

Fix it.

Fixes: a365ab6 cpufreq: intel_pstate: Implement the ->adjust_perf() callback
Signed-off-by: Doug Smythies <dsmythies@telus.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

@@ -2987,6 +2987,9 @@ static void intel_cpufreq_adjust_perf(unsigned int cpunum,
  if (min_pstate < cpu->min_perf_ratio)
  min_pstate = cpu->min_perf_ratio;
 
+ if (min_pstate > cpu->max_perf_ratio)
+ min_pstate = cpu->max_perf_ratio;
+
  max_pstate = min(cap_pstate, cpu->max_perf_ratio);
  if (max_pstate < min_pstate)
  max_pstate = min_pstate;