cpufreq: Fix re-boost issue after hotplugging a CPU

It turns out that CPUX will stay on the base frequency after performing
these operations:

 1. boost all CPUs: echo 1 > /sys/devices/system/cpu/cpufreq/boost

 2. offline one CPU: echo 0 > /sys/devices/system/cpu/cpuX/online

 3. deboost all CPUs: echo 0 > /sys/devices/system/cpu/cpufreq/boost

 4. online CPUX: echo 1 > /sys/devices/system/cpu/cpuX/online

 5. boost all CPUs again: echo 1 > /sys/devices/system/cpu/cpufreq/boost

This is because max_freq_req of the policy is not updated during the
online process, and the value of max_freq_req before the last offline is
retained.

When the CPU is boosted again, freq_qos_update_request() will do nothing
because the old value is the same as the new one. This causes the CPU to
stay at the base frequency. Updating max_freq_req  in cpufreq_online()
will solve this problem.

Signed-off-by: Lifeng Zheng <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Link: https://patch.msgid.link/[email protected]
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: Lifeng Zheng

drivers/cpufreq/cpufreq.c

@@ -1476,6 +1476,10 @@ static int cpufreq_online(unsigned int cpu)
 
 		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()) {