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Message-ID: <eba06c01-e2bb-f715-8b2e-9c489e7c06d3@gmail.com>
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
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