linux-kernel - Re: [PATCH 3/5] media: videobuf2-core.h: add a helper to get status of start

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Date:	Mon, 08 Sep 2014 10:06:07 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>,
	LMML <linux-media@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Pawel Osciak <pawel@...iak.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 3/5] media: videobuf2-core.h: add a helper to get status
 of start_streaming()

On 09/06/2014 05:26 PM, Lad, Prabhakar wrote:
> this patch adds a helper to get the status if start_streaming()
> was called successfully.

Nice! I've had the same idea for quite some time now, but for some reason
I never got around to actually adding it.

	Hans

> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> Cc: Pawel Osciak <pawel@...iak.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> ---
>  include/media/videobuf2-core.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index 5a10d8d..b3c9973 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -590,6 +590,15 @@ vb2_plane_size(struct vb2_buffer *vb, unsigned int plane_no)
>  	return 0;
>  }
>  
> +/**
> + * vb2_start_streaming_called() - return streaming status of driver
> + * @q:		videobuf queue
> + */
> +static inline bool vb2_start_streaming_called(struct vb2_queue *q)
> +{
> +	return q->start_streaming_called;
> +}
> +
>  /*
>   * The following functions are not part of the vb2 core API, but are simple
>   * helper functions that you can use in your struct v4l2_file_operations,
> 

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