cpufreq: Remove max_freq_req update for pre-existing policy

policy->max_freq_req QoS constraint represents the maximal allowed
frequency than can be requested. It is set by:
 - writing to policyX/scaling_max sysfs file
 - toggling the cpufreq/boost sysfs file

Upon calling freq_qos_update_request(), a successful update
of the max_freq_req value triggers cpufreq_notifier_max(),
followed by cpufreq_set_policy() which update the requested
frequency for the policy.
If the new max_freq_req value is not different from the
original value, no frequency update is triggered.

In a specific sequence of toggling:
 - cpufreq/boost sysfs file
 - CPU hot-plugging
a CPU could end up with boost enabled but running at the
maximal non-boost frequency, cpufreq_notifier_max() not being
triggered. The following fixed that:
commit 1608f0230510 ("cpufreq: Fix re-boost issue after hotplugging
a CPU")

The following:
commit dd016f379ebc ("cpufreq: Introduce a more generic way to
set default per-policy boost flag")
also fixed the issue by correctly setting the max_freq_req
constraint of a policy that is re-activated. This makes the
first fix unnecessary.

As the original issue is fixed by another method,
this patch reverts:
commit 1608f0230510 ("cpufreq: Fix re-boost issue after hotplugging
a CPU")

Reviewed-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://patch.msgid.link/20260326204404.1401849-2-pierre.gondois@arm.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 0f926ee23cdb397222959ead2b5b13057bff561d..b127f5cb682c78450da30716dff591d507298268 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1484,10 +1484,6 @@ static int cpufreq_policy_online(struct cpufreq_policy *policy,
 
                blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
                                CPUFREQ_CREATE_POLICY, policy);
-       } else {
-               ret = freq_qos_update_request(policy->max_freq_req, policy->max);
-               if (ret < 0)
-                       goto out_destroy_policy;
        }
 
        if (cpufreq_driver->get && has_target()) {