Also poll_wait() before checking the events since otherwise it's possible to
go to sleep and not getting woken up if the event arrives between the two
operations.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/videobuf2-core.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 594c75e..79acf5e 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -2003,13 +2003,14 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
unsigned int res = 0;
unsigned long flags;
- if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
+ if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) &&
+ req_events & POLLPRI) {
struct v4l2_fh *fh = file->private_data;
+ poll_wait(file, &fh->wait, wait);
+
if (v4l2_event_pending(fh))
res = POLLPRI;
- else if (req_events & POLLPRI)
- poll_wait(file, &fh->wait, wait);
}
if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM)))
--
1.8.3.2
--
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