linux-kernel - Re: [PATCH v2 1/5] iio: temperature: ltc2983: allocate iio channels once

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Date:   Sun, 23 Oct 2022 13:40:48 +0100
From:   Jonathan Cameron <jic23@...nel.org>
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>,
        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 v2 1/5] iio: temperature: ltc2983: allocate iio channels
 once

On Thu, 20 Oct 2022 12:02:53 +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.
> 
> Fixes: f110f3188e56 ("iio: temperature: Add support for LTC2983")
> Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
Note I already have this queued as a fix and I've sent the pull request to Greg this
morning.  For future versions of this series, maybe just put a note in the cover
letter to cover the dependency.

Jonathan

> ---
>  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;