linux-kernel - Re: [PATCH 1/4] PM / devfreq: passive: Fix get_target

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Message-ID: <ec3412aa-db49-b791-dc93-c15e56f79807@samsung.com>
Date:   Thu, 24 Jun 2021 10:38:12 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     andrew-sh.cheng@...iatek.com, hsinyi@...omium.org
Cc:     sibis@...eaurora.org, saravanak@...gle.com,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        chanwoo@...nel.org, cwchoi00@...il.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/4] PM / devfreq: passive: Fix get_target_freq when not
 using required-opp

On 6/17/21 3:05 PM, Chanwoo Choi wrote:
> The 86ad9a24f21e ("PM / devfreq: Add required OPPs support to passive governor")
> supported the required-opp property for using devfreq passive governor.
> But, 86ad9a24f21e has caused the problem on use-case when required-opp
> is not used such as exynos-bus.c devfreq driver. So that fix the
> get_target_freq of passive governor for supporting the case of when
> required-opp is not used.
> 
> Cc: stable@...r.kernel.org
> Fixes: 86ad9a24f21e ("PM / devfreq: Add required OPPs support to passive governor")
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  drivers/devfreq/governor_passive.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c
> index b094132bd20b..fc09324a03e0 100644
> --- a/drivers/devfreq/governor_passive.c
> +++ b/drivers/devfreq/governor_passive.c
> @@ -65,7 +65,7 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
>  		dev_pm_opp_put(p_opp);
>  
>  		if (IS_ERR(opp))
> -			return PTR_ERR(opp);
> +			goto no_required_opp;
>  
>  		*freq = dev_pm_opp_get_freq(opp);
>  		dev_pm_opp_put(opp);
> @@ -73,6 +73,7 @@ static int devfreq_passive_get_target_freq(struct devfreq *devfreq,
>  		return 0;
>  	}
>  
> +no_required_opp:
>  	/*
>  	 * Get the OPP table's index of decided frequency by governor
>  	 * of parent device.
> 

Applied it.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics