linux-kernel - Re: [PATCH 10/31] devfreq: exynos: Migrate to dev_pm_opp_set

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Date:   Tue, 31 May 2022 09:45:05 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/31] devfreq: exynos: Migrate to dev_pm_opp_set_config()

On 31-05-22, 13:12, Chanwoo Choi wrote:
> I try to find the cause of this warning.
> I think that dev_pm_opp_clear_config needs to check
> whether 'opp_table' is NULL or not as following:
> 
> 
> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
> index fba6e2b20b8f..cbf8f10b9ff0 100644
> --- a/drivers/opp/core.c
> +++ b/drivers/opp/core.c
> @@ -2598,6 +2598,9 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_config);
>   */
>  void dev_pm_opp_clear_config(struct opp_table *opp_table)
>  {
> +       if (unlikely(!opp_table))
> +               return;
> +
>         if (opp_table->genpd_virt_devs)
>                 dev_pm_opp_detach_genpd(opp_table);

Does this fixes it for you ?

It isn't allowed to call this routine with opp_table as NULL, I should
rather have a WARN() for the same instead.

Can you check why exynos is passing NULL here as I don't see an
obvious reason currently.

-- 
viresh