linux-kernel - Re: [PATCH5b51a54ae2fa1cc8459b68a28b3c8ca7b7203994] PM / devfreq: mtk-cci: Fix variable deferencing before NULL check

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Date:   Mon, 29 May 2023 23:27:51 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     Sukrut Bellary <sukrut.bellary@...ux.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH5b51a54ae2fa1cc8459b68a28b3c8ca7b7203994] PM / devfreq:
 mtk-cci: Fix variable deferencing before NULL check

On 23. 5. 18. 17:40, Sukrut Bellary wrote:
> smatch warning:
> drivers/devfreq/mtk-cci-devfreq.c:135 mtk_ccifreq_target()
> warn: variable dereferenced before check 'drv' (see line 130)
> 
> This is based on static analysis only. Compilation tested.
> 
> Signed-off-by: Sukrut Bellary <sukrut.bellary@...ux.com>
> ---
>  drivers/devfreq/mtk-cci-devfreq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/devfreq/mtk-cci-devfreq.c b/drivers/devfreq/mtk-cci-devfreq.c
> index e5458ada5197..6354622eda65 100644
> --- a/drivers/devfreq/mtk-cci-devfreq.c
> +++ b/drivers/devfreq/mtk-cci-devfreq.c
> @@ -127,7 +127,7 @@ static int mtk_ccifreq_target(struct device *dev, unsigned long *freq,
>  			      u32 flags)
>  {
>  	struct mtk_ccifreq_drv *drv = dev_get_drvdata(dev);
> -	struct clk *cci_pll = clk_get_parent(drv->cci_clk);
> +	struct clk *cci_pll;
>  	struct dev_pm_opp *opp;
>  	unsigned long opp_rate;
>  	int voltage, pre_voltage, inter_voltage, target_voltage, ret;
> @@ -139,6 +139,7 @@ static int mtk_ccifreq_target(struct device *dev, unsigned long *freq,
>  		return 0;
>  
>  	inter_voltage = drv->inter_voltage;
> +	cci_pll = clk_get_parent(drv->cci_clk);
>  
>  	opp_rate = *freq;
>  	opp = devfreq_recommended_opp(dev, &opp_rate, 1);

Applied it. Thanks.

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi