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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-12-29 18:08:18 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-12-30 18:22:17 +0100 |
| commit | be1283454b61a1f3b089f1a74b73e20532262e32 (patch) | |
| tree | cd5401910c4378f5ad3951fbbe32dfc6b7eba854 | |
| parent | Linux 5.11-rc1 (diff) | |
| download | linux-be1283454b61a1f3b089f1a74b73e20532262e32.tar.xz linux-be1283454b61a1f3b089f1a74b73e20532262e32.zip | |
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>
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 6e23376548ce..1a660466dd75 100644 --- 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_cpufreq.fast_switch = NULL; intel_cpufreq.adjust_perf = intel_cpufreq_adjust_perf; if (!default_driver) default_driver = &intel_pstate; |