From: hverkuil-cisco@xs4all.nl
To: linux-media@vger.kernel.org
Cc: Michael Ira Krufky <mkrufky@linuxtv.org>,
Brad Love <brad@nextdimension.cc>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>
Subject: [RFC PATCH 4/8] v4l2-ctrls.c: fix epoll() by calling poll_wait first
Date: Thu, 7 Feb 2019 12:49:44 +0100 [thread overview]
Message-ID: <20190207114948.37750-5-hverkuil-cisco@xs4all.nl> (raw)
In-Reply-To: <20190207114948.37750-1-hverkuil-cisco@xs4all.nl>
From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
The epoll function expects that whenever the poll file op is
called, the poll_wait function is also called. That didn't
always happen in v4l2_ctrl_poll(). Fix this, otherwise epoll()
would timeout when it shouldn't.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
drivers/media/v4l2-core/v4l2-ctrls.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 99308dac2daa..b79d3bbd8350 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -4166,9 +4166,9 @@ __poll_t v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait)
{
struct v4l2_fh *fh = file->private_data;
+ poll_wait(file, &fh->wait, wait);
if (v4l2_event_pending(fh))
return EPOLLPRI;
- poll_wait(file, &fh->wait, wait);
return 0;
}
EXPORT_SYMBOL(v4l2_ctrl_poll);
--
2.20.1
next prev parent reply other threads:[~2019-02-07 11:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-07 11:49 [RFC PATCH 0/8] cec/mc/vb2/dvb: fix epoll support hverkuil-cisco
2019-02-07 11:49 ` [RFC PATCH 1/8] cec: fix epoll() by calling poll_wait first hverkuil-cisco
2019-02-08 20:53 ` Sean Young
2019-02-07 11:49 ` [RFC PATCH 2/8] media-request: " hverkuil-cisco
2019-02-07 11:49 ` [RFC PATCH 3/8] vb2: " hverkuil-cisco
2019-02-07 11:49 ` hverkuil-cisco [this message]
2019-02-07 11:49 ` [RFC PATCH 5/8] v4l2-mem2mem: " hverkuil-cisco
2019-02-07 11:49 ` [RFC PATCH 6/8] v4l2-mem2mem: add q->error check to v4l2_m2m_poll() hverkuil-cisco
2019-02-07 11:49 ` [RFC PATCH 7/8] videobuf: fix epoll() by calling poll_wait first hverkuil-cisco
2019-02-07 11:49 ` [RFC PATCH 8/8] dvb-core: " hverkuil-cisco
2019-02-08 21:12 ` Sean Young
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