linux-kernel - Re: [PATCH v2] thermal/drivers/cpufreq_cooling: Update cpufreq

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Date:   Fri, 6 Nov 2020 14:55:45 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     zhuguangqing83@...il.com
Cc:     amit.kachhap@...il.com, daniel.lezcano@...aro.org,
        javi.merino@...nel.org, rui.zhang@...el.com, amitk@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhuguangqing <zhuguangqing@...omi.com>,
        "v5 . 4+" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] thermal/drivers/cpufreq_cooling: Update cpufreq_state
 only if state has changed

On 06-11-20, 17:22, zhuguangqing83@...il.com wrote:
> From: Zhuguangqing <zhuguangqing@...omi.com>
> 
> 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>
> ---
> v2:
>   - Add Fixes: 5130802ddbb1 in log.
>   - Add Cc: v5.4+ <stable@...r.kernel.org> # v5.4+ in log.
>   - Add Acked-by: Viresh Kumar <viresh.kumar@...aro.org> in log.
>   - Delete an extra blank line.
> ---
>  drivers/thermal/cpufreq_cooling.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
> index cc2959f22f01..612f063c1cfc 100644
> --- a/drivers/thermal/cpufreq_cooling.c
> +++ b/drivers/thermal/cpufreq_cooling.c
> @@ -438,13 +438,11 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
>  	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;

Thanks Zhuguangqing.

-- 
viresh