From 87a0c94ce616b231f3c0bd09d7dbd39d43b0557a Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Tue, 22 Feb 2011 12:31:07 -0300
Subject: [PATCH] [media] v4l2-ctrls: Fix control enumeration for multiple
 subdevs with ctrl

v4l2-ctl and qv4l2 enumerate controls using V4L2_CTRL_FLAG_NEXT_CTRL,
falling back to the old method if the flag isn't supported.

The v4l2_subdev_queryctrl function will currently handle that flag, but
for the controls of the subdev only. This isn't right, it should refuse
this flag, otherwise v4l2-ctl will only see the controls of the first
subdev.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/media/video/v4l2-ctrls.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c
index ef66d2af0c57c..2412f08527aa8 100644
--- a/drivers/media/video/v4l2-ctrls.c
+++ b/drivers/media/video/v4l2-ctrls.c
@@ -1364,6 +1364,8 @@ EXPORT_SYMBOL(v4l2_queryctrl);
 
 int v4l2_subdev_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
 {
+	if (qc->id & V4L2_CTRL_FLAG_NEXT_CTRL)
+		return -EINVAL;
 	return v4l2_queryctrl(sd->ctrl_handler, qc);
 }
 EXPORT_SYMBOL(v4l2_subdev_queryctrl);