linux-kernel - [PATCH 5.10 713/717] thermal/drivers/cpufreq_cooling: Update cpufreq

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Date:   Mon, 28 Dec 2020 13:51:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhuguangqing <zhuguangqing@...omi.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [PATCH 5.10 713/717] thermal/drivers/cpufreq_cooling: Update cpufreq_state only if state has changed

From: Zhuguangqing <zhuguangqing@...omi.com>

commit 236761f19a4f373354f1dcf399b57753f1f4b871 upstream.

If state has not changed successfully and we updated cpufreq_state,
next time when the new state is equal to cpufreq_state (not changed
successfully last time), we will return directly and miss a
freq_qos_update_request() that should have been.

Fixes: 5130802ddbb1 ("thermal: cpu_cooling: Switch to QoS requests for freq limits")
Cc: v5.4+ <stable@...r.kernel.org> # v5.4+
Signed-off-by: Zhuguangqing <zhuguangqing@...omi.com>
Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Link: https://lore.kernel.org/r/20201106092243.15574-1-zhuguangqing83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/thermal/cpufreq_cooling.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/thermal/cpufreq_cooling.c
+++ b/drivers/thermal/cpufreq_cooling.c
@@ -438,13 +438,11 @@ static int cpufreq_set_cur_state(struct
 	if (cpufreq_cdev->cpufreq_state == state)
 		return 0;
 
-	cpufreq_cdev->cpufreq_state = state;
-
 	frequency = get_state_freq(cpufreq_cdev, state);
 
 	ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency);
-
 	if (ret > 0) {
+		cpufreq_cdev->cpufreq_state = state;
 		cpus = cpufreq_cdev->policy->cpus;
 		max_capacity = arch_scale_cpu_capacity(cpumask_first(cpus));
 		capacity = frequency * max_capacity;