linux-kernel - Re: [PATCH] iio: adc: pac1921: add missing error return in probe()

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Message-ID: <9a98aab5-bb68-4206-9ecf-32fbf6c9c7ef@stanley.mountain>
Date: Fri, 9 Aug 2024 18:18:13 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Matteo Martelli <matteomartelli3@...il.com>
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>, jic23@...nel.org,
	kernel-janitors@...r.kernel.org, lars@...afoo.de,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: pac1921: add missing error return in probe()

On Fri, Aug 09, 2024 at 09:31:43AM +0200, Matteo Martelli wrote:
> Christophe JAILLET wrote:
> > Le 08/08/2024 à 21:28, Dan Carpenter a écrit :
> > > This error path was intended to return, and not just print an error.  The
> > > current code will lead to an error pointer dereference.
> > > 
> > > Fixes: 371f778b83cd ("iio: adc: add support for pac1921")
> > > Signed-off-by: Dan Carpenter <dan.carpenter-QSEj5FYQhm4dnm+yROfE0A@...lic.gmane.org>
> > > ---
> > >   drivers/iio/adc/pac1921.c | 4 ++--
> > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/iio/adc/pac1921.c b/drivers/iio/adc/pac1921.c
> > > index d04c6685d780..8200a47bdf21 100644
> > > --- a/drivers/iio/adc/pac1921.c
> > > +++ b/drivers/iio/adc/pac1921.c
> > > @@ -1168,8 +1168,8 @@ static int pac1921_probe(struct i2c_client *client)
> > >   
> > >   	priv->regmap = devm_regmap_init_i2c(client, &pac1921_regmap_config);
> > >   	if (IS_ERR(priv->regmap))
> > > -		dev_err_probe(dev, (int)PTR_ERR(priv->regmap),
> > > -			      "Cannot initialize register map\n");
> > > +		return dev_err_probe(dev, (int)PTR_ERR(priv->regmap),
> > 
> > The (int) is unusual.
> >
> The (int) explicit cast is to address Wconversion warnings since dev_err_probe
> takes an int as argument.

I don't want to remove the int because it's unrelated, but Christophe is right
that the int is unusual.  We really would want to discourage that.

regards,
dan carpenter