linux-kernel - Re: [RESEND] crypto: atmel-aes: use swap()

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Date:   Fri, 23 Jul 2021 04:31:59 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <salah.triki@...il.com>, <herbert@...dor.apana.org.au>,
        <davem@...emloft.net>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>,
        <gregkh@...uxfoundation.org>
CC:     <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND] crypto: atmel-aes: use swap()

On 7/22/21 8:08 PM, Salah Triki wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Use swap() instead of implementing it in order to make code more clean.
> 
> Signed-off-by: Salah Triki <salah.triki@...il.com>
> ---
>  drivers/crypto/atmel-aes.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
> index b1d286004295..60041022c4f5 100644
> --- a/drivers/crypto/atmel-aes.c
> +++ b/drivers/crypto/atmel-aes.c
> @@ -1819,12 +1819,8 @@ static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd)
>          * the order of the ciphered tweak bytes need to be reversed before
>          * writing them into the ODATARx registers.
>          */
> -       for (i = 0; i < AES_BLOCK_SIZE/2; ++i) {
> -               u8 tmp = tweak_bytes[AES_BLOCK_SIZE - 1 - i];
> -
> -               tweak_bytes[AES_BLOCK_SIZE - 1 - i] = tweak_bytes[i];
> -               tweak_bytes[i] = tmp;
> -       }
> +       for (i = 0; i < AES_BLOCK_SIZE/2; ++i)

There could have been spaces around that '/', but I see it was kept as it was
before. It's fine either way.
 
> +               swap(tweak_bytes[i], tweak_bytes[AES_BLOCK_SIZE - 1 - i]);
> 
>         /* Process the data. */
>         atmel_aes_write_ctrl(dd, use_dma, NULL);
> --
> 2.25.1
>