--- zzzz-none-000/linux-3.10.107/drivers/media/v4l2-core/v4l2-fh.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/media/v4l2-core/v4l2-fh.c	2021-02-04 17:41:59.000000000 +0000
@@ -37,6 +37,13 @@
 	fh->ctrl_handler = vdev->ctrl_handler;
 	INIT_LIST_HEAD(&fh->list);
 	set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags);
+	/*
+	 * determine_valid_ioctls() does not know if struct v4l2_fh
+	 * is used by this driver, but here we do. So enable the
+	 * prio ioctls here.
+	 */
+	set_bit(_IOC_NR(VIDIOC_G_PRIORITY), vdev->valid_ioctls);
+	set_bit(_IOC_NR(VIDIOC_S_PRIORITY), vdev->valid_ioctls);
 	fh->prio = V4L2_PRIORITY_UNSET;
 	init_waitqueue_head(&fh->wait);
 	INIT_LIST_HEAD(&fh->available);
@@ -49,8 +56,7 @@
 {
 	unsigned long flags;
 
-	if (test_bit(V4L2_FL_USE_FH_PRIO, &fh->vdev->flags))
-		v4l2_prio_open(fh->vdev->prio, &fh->prio);
+	v4l2_prio_open(fh->vdev->prio, &fh->prio);
 	spin_lock_irqsave(&fh->vdev->fh_lock, flags);
 	list_add(&fh->list, &fh->vdev->fh_list);
 	spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
@@ -78,8 +84,7 @@
 	spin_lock_irqsave(&fh->vdev->fh_lock, flags);
 	list_del_init(&fh->list);
 	spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
-	if (test_bit(V4L2_FL_USE_FH_PRIO, &fh->vdev->flags))
-		v4l2_prio_close(fh->vdev->prio, fh->prio);
+	v4l2_prio_close(fh->vdev->prio, fh->prio);
 }
 EXPORT_SYMBOL_GPL(v4l2_fh_del);