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media: cec: 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 cec_poll(). Fix this, otherwise epoll()
would timeout when it shouldn't.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2019-02-07 06:49:41 -05:00 committed by Mauro Carvalho Chehab
parent 7e4e716244
commit b7990bcfb6
1 changed files with 1 additions and 1 deletions
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2
drivers/media/cec/cec-api.c
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@ -38,6 +38,7 @@ static __poll_t cec_poll(struct file *filp,
struct cec_adapter *adap = fh->adap;
__poll_t res = 0;
poll_wait(filp, &fh->wait, poll);
if (!cec_is_registered(adap))
return EPOLLERR | EPOLLHUP;
mutex_lock(&adap->lock);
@ -48,7 +49,6 @@ static __poll_t cec_poll(struct file *filp,
res |= EPOLLIN | EPOLLRDNORM;
if (fh->total_queued_events)
res |= EPOLLPRI;
poll_wait(filp, &fh->wait, poll);
mutex_unlock(&adap->lock);
return res;
}