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media: v4l2-ctrls.c: fix epoll() by calling poll_wait first 

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>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2019-02-07 06:49:44 -05:00 committed by Mauro Carvalho Chehab
parent 914c686864
commit 398d768025
1 changed files with 1 additions and 1 deletions
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2
drivers/media/v4l2-core/v4l2-ctrls.c
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@ -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);