The current implementation allowed polling for events even if none were
subscribed. This may be troublesome in multi-threaded applications where the
thread handling the subscription is different from the one that handles the
events.
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
---
drivers/media/v4l2-core/videobuf2-core.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/media/v4l2-core/videobuf2-core.c
b/drivers/media/v4l2-core/videobuf2-core.c
index 79acf5e..c5dc903 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -2011,6 +2011,9 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file
*file, poll_table *wait)
if (v4l2_event_pending(fh))
res = POLLPRI;
+
+ if (!v4l2_event_has_subscribed(fh))
+ return POLLERR | POLLPRI;
}
if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN |
POLLRDNORM)))
--
1.8.3.2
--
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