linux-kernel - Re: [PATCH 4/6] [media] s5p-jpeg: only fill driver's name in capabilities driver field

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Message-ID: <5763A30A.5060201@xs4all.nl>
Date:	Fri, 17 Jun 2016 09:13:14 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Javier Martinez Canillas <javier@....samsung.com>,
	linux-kernel@...r.kernel.org
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 4/6] [media] s5p-jpeg: only fill driver's name in
 capabilities driver field

On 06/16/2016 11:40 PM, Javier Martinez Canillas wrote:
> The driver fills in both the struct v4l2_capability driver and card fields
> the same values, that is the driver's name plus the information if the dev
> is a decoder or an encoder.
> 
> But the driver field has a fixed length of 16 bytes so the filled data is
> truncated:
> 
> Driver Info (not using libv4l2):
>         Driver name   : s5p-jpeg decode
>         Card type     : s5p-jpeg decoder
>         Bus info      : platform:11f50000.jpeg
>         Driver version: 4.7.0
> 
> Also, this field should only contain the driver's name so use just that.
> The information if the device is a decoder or an encoder is in the card
> type field anyways.
> 
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

Acked-by: Hans Verkuil <hans.verkuil@...co.com>

Thanks!

Hans

> ---
> 
>  drivers/media/platform/s5p-jpeg/jpeg-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> index e3ff3d4bd72e..f9fb52a53e79 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> @@ -1246,12 +1246,12 @@ static int s5p_jpeg_querycap(struct file *file, void *priv,
>  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
>  
>  	if (ctx->mode == S5P_JPEG_ENCODE) {
> -		strlcpy(cap->driver, S5P_JPEG_M2M_NAME " encoder",
> +		strlcpy(cap->driver, S5P_JPEG_M2M_NAME,
>  			sizeof(cap->driver));
>  		strlcpy(cap->card, S5P_JPEG_M2M_NAME " encoder",
>  			sizeof(cap->card));
>  	} else {
> -		strlcpy(cap->driver, S5P_JPEG_M2M_NAME " decoder",
> +		strlcpy(cap->driver, S5P_JPEG_M2M_NAME,
>  			sizeof(cap->driver));
>  		strlcpy(cap->card, S5P_JPEG_M2M_NAME " decoder",
>  			sizeof(cap->card));
>