linux-kernel - Re: [PATCH v1] Input: ads7846: ads7846_get_value

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Message-ID: <YTrnUFI53iwvwxrj@google.com>
Date:   Thu, 9 Sep 2021 22:04:16 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Mark Brown <broonie@...nel.org>,
        kernel test robot <lkp@...el.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        linux-spi@...r.kernel.org, David Jander <david@...tonic.nl>
Subject: Re: [PATCH v1] Input: ads7846: ads7846_get_value - fix unaligned
 pointer value warning

Hi Oleksij,

On Wed, Jul 07, 2021 at 02:41:15PM +0200, Oleksij Rempel wrote:
> Fix warning reported by the kernel test robot:
> drivers/input/touchscreen/ads7846.c:705:24: warning: taking address
> of packed member 'data' of class or structure 'ads7846_buf' may result
> in an unaligned pointer value [-Waddress-of-packed-member]
> 
> Fixes: 6965eece2a89 ("Input: ads7846 - convert to one message")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/input/touchscreen/ads7846.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
> index adb4c2230c31..1987dedac94f 100644
> --- a/drivers/input/touchscreen/ads7846.c
> +++ b/drivers/input/touchscreen/ads7846.c
> @@ -702,7 +702,7 @@ static int ads7846_get_value(struct ads7846_buf *buf)
>  {
>  	int value;
>  
> -	value = be16_to_cpup(&buf->data);
> +	value = get_unaligned_be16(&buf->data);

ds7846_buf is declared as packed so I believe using be16_to_cpu(buf->data)
will suffice.

I can adjust on my side if you agree.

Thanks.

-- 
Dmitry