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

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Message-Id: <32566dbc40ed36da1ef324afd8a09813c1bc080c.1317281827.git.hans.verkuil@cisco.com>
Date:	Thu, 29 Sep 2011 09:44:08 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	linux-media@...r.kernel.org
Cc:	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: [RFCv4 PATCH 2/6] ivtv: only start streaming in poll() if polling for input.

From: Hans Verkuil <hans.verkuil@...co.com>

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
---
 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);
-- 
1.7.5.4

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