linux-kernel - Re: [PATCH 3/4] iio: adc: Use devm_krealloc

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Message-ID: <a5bb0516-9a21-5d46-d557-f02893ac8bf4@amd.com>
Date:   Wed, 8 Mar 2023 12:58:46 +0100
From:   Michal Simek <michal.simek@....com>
To:     James Clark <james.clark@....com>, linux-kernel@...r.kernel.org
Cc:     Jonathan Corbet <corbet@....net>,
        Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>,
        Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michal Simek <michal.simek@...inx.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-doc@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 3/4] iio: adc: Use devm_krealloc_array



On 3/6/23 16:27, James Clark wrote:
> 
> Now that it exists, use it instead of doing the multiplication and
> checking for overflow manually.
> 
> Signed-off-by: James Clark <james.clark@....com>
> ---
>   drivers/iio/adc/xilinx-ams.c       |  9 +++------
>   drivers/iio/adc/xilinx-xadc-core.c | 17 +++++++----------
>   2 files changed, 10 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/iio/adc/xilinx-ams.c b/drivers/iio/adc/xilinx-ams.c
> index 34cf336b3490..f0b71a1220e0 100644
> --- a/drivers/iio/adc/xilinx-ams.c
> +++ b/drivers/iio/adc/xilinx-ams.c
> @@ -1263,7 +1263,7 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
>          struct device *dev = indio_dev->dev.parent;
>          struct fwnode_handle *child = NULL;
>          struct fwnode_handle *fwnode = dev_fwnode(dev);
> -       size_t ams_size, dev_size;
> +       size_t ams_size;
>          int ret, ch_cnt = 0, i, rising_off, falling_off;
>          unsigned int num_channels = 0;
> 
> @@ -1320,11 +1320,8 @@ static int ams_parse_firmware(struct iio_dev *indio_dev)
>                  }
>          }
> 
> -       dev_size = array_size(sizeof(*dev_channels), num_channels);
> -       if (dev_size == SIZE_MAX)
> -               return -ENOMEM;
> -
> -       dev_channels = devm_krealloc(dev, ams_channels, dev_size, GFP_KERNEL);
> +       dev_channels = devm_krealloc_array(dev, ams_channels, num_channels,
> +                                          sizeof(*dev_channels), GFP_KERNEL);
>          if (!dev_channels)
>                  return -ENOMEM;
> 
> diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
> index 292f2892d223..287df3bb951e 100644
> --- a/drivers/iio/adc/xilinx-xadc-core.c
> +++ b/drivers/iio/adc/xilinx-xadc-core.c
> @@ -613,20 +613,17 @@ static int xadc_update_scan_mode(struct iio_dev *indio_dev,
>          const unsigned long *mask)
>   {
>          struct xadc *xadc = iio_priv(indio_dev);
> -       size_t new_size, n;
> +       size_t n;
>          void *data;
> 
>          n = bitmap_weight(mask, indio_dev->masklength);
> 
> -       if (check_mul_overflow(n, sizeof(*xadc->data), &new_size))
> -               return -ENOMEM;
> -
> -       data = devm_krealloc(indio_dev->dev.parent, xadc->data,
> -                            new_size, GFP_KERNEL);
> +       data = devm_krealloc_array(indio_dev->dev.parent, xadc->data,
> +                                  n, sizeof(*xadc->data), GFP_KERNEL);
>          if (!data)
>                  return -ENOMEM;
> 
> -       memset(data, 0, new_size);
> +       memset(data, 0, n*sizeof(*xadc->data));

this is not correct coding style.

M