linux-kernel - Re: [PATCH v8 01/13] [media] xilinx: regroup caps on querycap

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Date:   Tue, 13 Mar 2018 19:30:41 -0700
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Gustavo Padovan <gustavo@...ovan.org>, linux-media@...r.kernel.org
Cc:     kernel@...labora.com,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Pawel Osciak <pawel@...iak.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        Sakari Ailus <sakari.ailus@....fi>,
        Brian Starkey <brian.starkey@....com>,
        linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Subject: Re: [PATCH v8 01/13] [media] xilinx: regroup caps on querycap

On 03/09/2018 09:49 AM, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@...labora.com>
> 
> To better organize the code we concentrate the setting of
> V4L2_CAP_STREAMING in one place.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com>
> ---
>  drivers/media/platform/xilinx/xilinx-dma.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
> index 522cdfdd3345..565e466ba4fa 100644
> --- a/drivers/media/platform/xilinx/xilinx-dma.c
> +++ b/drivers/media/platform/xilinx/xilinx-dma.c
> @@ -494,13 +494,14 @@ xvip_dma_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
>  	struct v4l2_fh *vfh = file->private_data;
>  	struct xvip_dma *dma = to_xvip_dma(vfh->vdev);
>  
> -	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
> +	cap->device_caps = V4L2_CAP_STREAMING;
> +	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS
>  			  | dma->xdev->v4l2_caps;

Shouldn't this cap->capabilities assignment be moved down to after the
if-else? Otherwise cap->device_caps isn't fully initialized yet.

>  
>  	if (dma->queue.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
> -		cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +		cap->device_caps |= V4L2_CAP_VIDEO_CAPTURE;
>  	else
> -		cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> +		cap->device_caps |= V4L2_CAP_VIDEO_OUTPUT;
>  
>  	strlcpy(cap->driver, "xilinx-vipp", sizeof(cap->driver));
>  	strlcpy(cap->card, dma->video.name, sizeof(cap->card));
> 

Regards,

	Hans