linux-kernel - [RFCv4 PATCH 4/6] videobuf: only start streaming in poll() if so requested by the poll mask.

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Message-Id: <0ff6a902e6c8cf127bd60e813996d155fb2578a3.1317281827.git.hans.verkuil@cisco.com>
Date:	Thu, 29 Sep 2011 09:44:10 +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 4/6] videobuf: only start streaming in poll() if so requested by the poll mask.

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

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
---
 drivers/media/video/videobuf-core.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index de4fa4e..ffdf59c 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -1129,6 +1129,7 @@ unsigned int videobuf_poll_stream(struct file *file,
 				  struct videobuf_queue *q,
 				  poll_table *wait)
 {
+	unsigned long req_events = poll_requested_events(wait);
 	struct videobuf_buffer *buf = NULL;
 	unsigned int rc = 0;
 
@@ -1137,7 +1138,7 @@ unsigned int videobuf_poll_stream(struct file *file,
 		if (!list_empty(&q->stream))
 			buf = list_entry(q->stream.next,
 					 struct videobuf_buffer, stream);
-	} else {
+	} else if (req_events & (POLLIN | POLLRDNORM)) {
 		if (!q->reading)
 			__videobuf_read_start(q);
 		if (!q->reading) {
-- 
1.7.5.4

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