@@ -2363,13 +2363,20 @@ __poll_t vb2_core_poll(struct vb2_queue *q, struct file *file,
struct vb2_buffer *vb = NULL;
unsigned long flags;
+ /*
+ * poll_wait() MUST be called on the first invocation on all the
+ * potential queues of interest, even if we are not interested in their
+ * events during this first call. Failure to do so will result in
+ * queue's events to be ignored because the poll_table won't be capable
+ * of adding new wait queues thereafter.
+ */
+ poll_wait(file, &q->done_wq, wait);
+
if (!q->is_output && !(req_events & (EPOLLIN | EPOLLRDNORM)))
return 0;
if (q->is_output && !(req_events & (EPOLLOUT | EPOLLWRNORM)))
return 0;
- poll_wait(file, &q->done_wq, wait);
-
/*
* Start file I/O emulator only if streaming API has not been used yet.
*/
do_poll()/do_select() seem to set the _qproc member of poll_table to NULL the first time they are called on a given table, making subsequent calls of poll_wait() on that table no-ops. This is a problem for vb2 which calls poll_wait() on the V4L2 queues' waitqueues only when a queue-related event is requested, which may not necessarily be the case during the first poll. Fix this by making the call to poll_wait() happen first thing and unconditionally in vb2_core_poll(). Signed-off-by: Alexandre Courbot <gnurou@gmail.com> --- drivers/media/common/videobuf2/videobuf2-core.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)