linux-kernel - Re: [PATCH -next] mfd: pm8008: Fix return value check in pm8008

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Date:   Thu, 3 Jun 2021 12:05:06 -0700
From:   Guru Das Srinagesh <gurus@...eaurora.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Yang Yingliang <yangyingliang@...wei.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>, Lee Jones <lee.jones@...aro.org>,
        Andy Gross <agross@...nel.org>
Subject: Re: [PATCH -next] mfd: pm8008: Fix return value check in
 pm8008_probe()

On Thu, Jun 03, 2021 at 08:31:28PM +0300, Dmitry Baryshkov wrote:
> On Thu, 3 Jun 2021 at 20:18, Guru Das Srinagesh <gurus@...eaurora.org> wrote:
> >
> > On Thu, Jun 03, 2021 at 10:13:57PM +0800, Yang Yingliang wrote:
> > > In case of error, the function devm_regmap_init_i2c() returns ERR_PTR()
> > > and never returns NULL. The NULL test in the return value check
> > > should be replaced with IS_ERR().
> > >
> > > Fixes: 6b149f3310a4 ("mfd: pm8008: Add driver for QCOM PM8008 PMIC")
> > > Reported-by: Hulk Robot <hulkci@...wei.com>
> > > Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> >
> > Acked-by: Guru Das Srinagesh <gurus@...eaurora.org>
> 
> Interestingly, the change does not correspond to the changelog
> message. And the code is correct as devm_kzalloc returns NULL if I
> remember correctly.

Thanks for pointing that out - I missed that. I would like to retract my
Acked-by for this patch.

> 
> >
> > > ---
> > >  drivers/mfd/qcom-pm8008.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/mfd/qcom-pm8008.c b/drivers/mfd/qcom-pm8008.c
> > > index c472d7f8103c..dfefa60d693b 100644
> > > --- a/drivers/mfd/qcom-pm8008.c
> > > +++ b/drivers/mfd/qcom-pm8008.c
> > > @@ -223,7 +223,7 @@ static int pm8008_probe(struct i2c_client *client)
> > >       struct pm8008_data *chip;
> > >
> > >       chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
> > > -     if (!chip)
> > > +     if (IS_ERR(chip))
> > >               return -ENOMEM;
> > >
> > >       chip->dev = &client->dev;
> > > --
> > > 2.25.1
> > >
> 
> 
> 
> -- 
> With best wishes
> Dmitry