cpufreq: intel_pstate: Fix fast-switch fallback path

When sugov_update_single_perf() falls back to the "frequency"
path due to the missing scale-invariance, it will call
cpufreq_driver_fast_switch() via sugov_fast_switch()
and the driver's ->fast_switch() callback will be invoked,
so it must not be NULL.

However, after commit a365ab6b9dfb ("cpufreq: intel_pstate: Implement
the ->adjust_perf() callback") intel_pstate sets ->fast_switch() to
NULL when it is going to use intel_cpufreq_adjust_perf(), which is a
mistake, because on x86 the scale-invariance may be turned off
dynamically, so modify it to retain the original ->adjust_perf()
callback pointer.

Fixes: a365ab6b9dfb ("cpufreq: intel_pstate: Implement the ->adjust_perf() callback")
Reported-by: Kenneth R. Crudup <kenny@panix.com>
Tested-by: Kenneth R. Crudup <kenny@panix.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 6e23376..1a66046 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -3086,7 +3086,6 @@ static int __init intel_pstate_init(void)
                        intel_pstate.attr = hwp_cpufreq_attrs;
                        intel_cpufreq.attr = hwp_cpufreq_attrs;
                        intel_cpufreq.flags |= CPUFREQ_NEED_UPDATE_LIMITS;
                        intel_pstate.attr = hwp_cpufreq_attrs;
                        intel_cpufreq.attr = hwp_cpufreq_attrs;
                        intel_cpufreq.flags |= CPUFREQ_NEED_UPDATE_LIMITS;

-                       intel_cpufreq.fast_switch = NULL;

                        intel_cpufreq.adjust_perf = intel_cpufreq_adjust_perf;
                        if (!default_driver)
                                default_driver = &intel_pstate;
                        intel_cpufreq.adjust_perf = intel_cpufreq_adjust_perf;
                        if (!default_driver)
                                default_driver = &intel_pstate;