[media] media: v4l2-core: remove the use of V4L2_FL_USE_FH_PRIO flag

Since all the drivers that use `struct v4l2_fh' use the core priority
checking instead of doing it themselves, this flag can be removed.

This patch removes the usage of the flag from v4l2-core.

Signed-off-by: Ramakrishnan Muthukrishnan <ramakrmu@cisco.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/v4l2-core/v4l2-dev.c

@@ -563,11 +563,9 @@ static void determine_valid_ioctls(struct video_device *vdev)
 	/* vfl_type and vfl_dir independent ioctls */
 
 	SET_VALID_IOCTL(ops, VIDIOC_QUERYCAP, vidioc_querycap);
-	if (ops->vidioc_g_priority ||
-			test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags))
+	if (ops->vidioc_g_priority)
 		set_bit(_IOC_NR(VIDIOC_G_PRIORITY), valid_ioctls);
-	if (ops->vidioc_s_priority ||
-			test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags))
+	if (ops->vidioc_s_priority)
 		set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
 	SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
 	SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);

drivers/media/v4l2-core/v4l2-fh.c

@@ -37,6 +37,13 @@ void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev)
 	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 @@ void v4l2_fh_add(struct v4l2_fh *fh)
 {
 	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 @@ void v4l2_fh_del(struct v4l2_fh *fh)
 	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);
 

drivers/media/v4l2-core/v4l2-ioctl.c

@@ -2190,7 +2190,6 @@ static long __video_do_ioctl(struct file *file,
 	const struct v4l2_ioctl_info *info;
 	void *fh = file->private_data;
 	struct v4l2_fh *vfh = NULL;
-	int use_fh_prio = 0;
 	int debug = vfd->debug;
 	long ret = -ENOTTY;
 
@@ -2200,10 +2199,8 @@ static long __video_do_ioctl(struct file *file,
 		return ret;
 	}
 
-	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
+	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags))
 		vfh = file->private_data;
-		use_fh_prio = test_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
-	}
 
 	if (v4l2_is_known_ioctl(cmd)) {
 		info = &v4l2_ioctls[_IOC_NR(cmd)];
@@ -2212,7 +2209,7 @@ static long __video_do_ioctl(struct file *file,
 		    !((info->flags & INFO_FL_CTRL) && vfh && vfh->ctrl_handler))
 			goto done;
 
-		if (use_fh_prio && (info->flags & INFO_FL_PRIO)) {
+		if (vfh && (info->flags & INFO_FL_PRIO)) {
 			ret = v4l2_prio_check(vfd->prio, vfh->prio);
 			if (ret)
 				goto done;
@@ -2237,7 +2234,7 @@ static long __video_do_ioctl(struct file *file,
 		ret = -ENOTTY;
 	} else {
 		ret = ops->vidioc_default(file, fh,
-			use_fh_prio ? v4l2_prio_check(vfd->prio, vfh->prio) >= 0 : 0,
+			vfh ? v4l2_prio_check(vfd->prio, vfh->prio) >= 0 : 0,
 			cmd, arg);
 	}