linux-kernel - Re: [PATCH v4 4/8] iio: core: Calculate alloc_size only once in iio_device

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Date: Wed, 28 Feb 2024 14:57:36 -0600
From: David Lechner <dlechner@...libre.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Vinod Koul <vkoul@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Jonathan Cameron <Jonathan.Cameron@...wei.com>, Mark Brown <broonie@...nel.org>, 
	Kees Cook <keescook@...omium.org>, linux-arm-kernel@...ts.infradead.org, 
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-iio@...r.kernel.org, linux-spi@...r.kernel.org, netdev@...r.kernel.org, 
	linux-hardening@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>, 
	Lars-Peter Clausen <lars@...afoo.de>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: Re: [PATCH v4 4/8] iio: core: Calculate alloc_size only once in iio_device_alloc()

On Wed, Feb 28, 2024 at 2:49 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> No need to rewrite the value, instead use 'else' branch.
> This will also help further refactoring the code later on.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/iio/industrialio-core.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index bd305fa87093..1986b3386307 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -1643,11 +1643,10 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
>         struct iio_dev *indio_dev;
>         size_t alloc_size;
>
> -       alloc_size = sizeof(struct iio_dev_opaque);
> -       if (sizeof_priv) {
> -               alloc_size = ALIGN(alloc_size, IIO_DMA_MINALIGN);
> -               alloc_size += sizeof_priv;
> -       }
> +       if (sizeof_priv)
> +               alloc_size = ALIGN(alloc_size, IIO_DMA_MINALIGN) + sizeof_priv;

Isn't this using alloc_size before it is assigned? Perhaps you meant this:

    alloc_size = ALIGN(sizeof(struct iio_dev_opaque),
IIO_DMA_MINALIGN) + sizeof_priv;


> +       else
> +               alloc_size = sizeof(struct iio_dev_opaque);
>
>         iio_dev_opaque = kzalloc(alloc_size, GFP_KERNEL);
>         if (!iio_dev_opaque)