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Date:   Thu, 9 Sep 2021 22:04:16 -0700
From:   Dmitry Torokhov <dmitry.torokhov@gmail.com>
To:     Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     Alexandru Ardelean <alexandru.ardelean@analog.com>,
        Mark Brown <broonie@kernel.org>,
        kernel test robot <lkp@intel.com>, kernel@pengutronix.de,
        linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
        linux-spi@vger.kernel.org, David Jander <david@protonic.nl>
Subject: Re: [PATCH v1] Input: ads7846: ads7846_get_value - fix unaligned
 pointer value warning
Message-ID: <YTrnUFI53iwvwxrj@google.com>
References: <20210707124115.20028-1-o.rempel@pengutronix.de>
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In-Reply-To: <20210707124115.20028-1-o.rempel@pengutronix.de>
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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@intel.com>
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.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