linux-kernel - Re: [RFCv4 PATCH 2/6] ivtv: only start streaming in poll() if polling for input.

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Date:	Sun, 02 Oct 2011 08:13:11 -0400
From:	Andy Walls <awalls@...metrocast.net>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [RFCv4 PATCH 2/6] ivtv: only start streaming in poll() if
 polling for input.

On Thu, 2011-09-29 at 09:44 +0200, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@...co.com>
> 
> Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>

FWIW:

Acked-by: Andy Walls <awalls@...metrocast.net>

-Andy


> ---
>  drivers/media/video/ivtv/ivtv-fileops.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/video/ivtv/ivtv-fileops.c b/drivers/media/video/ivtv/ivtv-fileops.c
> index 38f0522..a931ecf 100644
> --- a/drivers/media/video/ivtv/ivtv-fileops.c
> +++ b/drivers/media/video/ivtv/ivtv-fileops.c
> @@ -744,8 +744,9 @@ unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
>  	return res;
>  }
>  
> -unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
> +unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
>  {
> +	unsigned long req_events = poll_requested_events(wait);
>  	struct ivtv_open_id *id = fh2id(filp->private_data);
>  	struct ivtv *itv = id->itv;
>  	struct ivtv_stream *s = &itv->streams[id->type];
> @@ -753,7 +754,8 @@ unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
>  	unsigned res = 0;
>  
>  	/* Start a capture if there is none */
> -	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
> +	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
> +			(req_events & (POLLIN | POLLRDNORM))) {
>  		int rc;
>  
>  		mutex_lock(&itv->serialize_lock);


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