linux-kernel - Re: [PATCH 2/5] iio: adc: xilinx: use devm_krealloc() instead of kfree() + kcalloc()

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Message-ID: <CAHp75VfeBXszvhrz_YgtX6=HY=TJJXhWdTSTC1=S4UV2cOkJvA@mail.gmail.com>
Date:   Tue, 27 Oct 2020 11:33:17 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Michal Simek <michal.simek@...inx.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 2/5] iio: adc: xilinx: use devm_krealloc() instead of
 kfree() + kcalloc()

On Mon, Oct 26, 2020 at 4:03 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> We now have devm_krealloc() in the kernel Use it indstead of calling
> kfree() and kcalloc() separately.

Which is completely lawful when size > previous_size (I mean, the
additional patch you sent previously seems not related to this).

> -       kfree(xadc->data);
> -       xadc->data = kcalloc(n, sizeof(*xadc->data), GFP_KERNEL);
> +       xadc->data = devm_krealloc(indio_dev->dev.parent, xadc->data,
> +                                  n * sizeof(*xadc->data),

I think you need to use something from overflow.h instead of explicit
multiplication here.

> +                                  GFP_KERNEL | __GFP_ZERO);

-- 
With Best Regards,
Andy Shevchenko