linux-kernel - Re: [PATCH 1/3] iio: temperature: ltc2983: allocate iio channels once

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Date:   Fri, 14 Oct 2022 16:18:24 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Cosmin Tanislav <demonsingur@...il.com>
CC:     Nuno Sá <nuno.sa@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        "Jonathan Cameron" <jic23@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Cosmin Tanislav <cosmin.tanislav@...log.com>
Subject: Re: [PATCH 1/3] iio: temperature: ltc2983: allocate iio channels
 once

On Fri, 14 Oct 2022 15:11:47 +0100
Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:

> On Fri, 14 Oct 2022 15:37:22 +0300
> Cosmin Tanislav <demonsingur@...il.com> wrote:
> 
> > From: Cosmin Tanislav <cosmin.tanislav@...log.com>
> > 
> > Currently, every time the device wakes up from sleep, the
> > iio_chan array is reallocated, leaking the previous one
> > until the device is removed (basically never).
> > 
> > Move the allocation to the probe function to avoid this.
> > 
> > Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>  
> Hi Cosmin,
> 
> Please give a fixes tag for this one as we'll definitely want to
> backport it.
> 
> Reply to this patch is fine as b4 will pick it up like any other tag.
Fixes: f110f3188e563 ("iio: temperature: Add support for LTC2983")

(from direct mail)

> 
> > ---
> >  drivers/iio/temperature/ltc2983.c | 13 ++++++-------
> >  1 file changed, 6 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
> > index b652d2b39bcf..a60ccf183687 100644
> > --- a/drivers/iio/temperature/ltc2983.c
> > +++ b/drivers/iio/temperature/ltc2983.c
> > @@ -1385,13 +1385,6 @@ static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio)
> >  		return ret;
> >  	}
> >  
> > -	st->iio_chan = devm_kzalloc(&st->spi->dev,
> > -				    st->iio_channels * sizeof(*st->iio_chan),
> > -				    GFP_KERNEL);
> > -
> > -	if (!st->iio_chan)
> > -		return -ENOMEM;
> > -
> >  	ret = regmap_update_bits(st->regmap, LTC2983_GLOBAL_CONFIG_REG,
> >  				 LTC2983_NOTCH_FREQ_MASK,
> >  				 LTC2983_NOTCH_FREQ(st->filter_notch_freq));
> > @@ -1514,6 +1507,12 @@ static int ltc2983_probe(struct spi_device *spi)
> >  		gpiod_set_value_cansleep(gpio, 0);
> >  	}
> >  
> > +	st->iio_chan = devm_kzalloc(&spi->dev,
> > +				    st->iio_channels * sizeof(*st->iio_chan),
> > +				    GFP_KERNEL);
> > +	if (!st->iio_chan)
> > +		return -ENOMEM;
> > +
> >  	ret = ltc2983_setup(st, true);
> >  	if (ret)
> >  		return ret;  
> 
>