linux-kernel - [PATCH] media: uvcvideo: Fix handling on Bitmask controls

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Date:   Fri,  3 Dec 2021 11:57:40 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH] media: uvcvideo: Fix handling on Bitmask controls

Minimum and step values for V4L2_CTRL_TYPE_BITMASK controls should be 0.
There is no need to query the camera firmware about this and maybe get
invalid results.

Fixes v4l2-compliane:
Control ioctls (Input 0):
                fail: v4l2-test-controls.cpp(97): minimum must be 0 for a bitmask control
	test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: FAIL

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index b4f6edf968bc..d478cfbad5bb 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1156,7 +1156,8 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 		break;
 	}
 
-	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN)
+	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_MIN &&
+	    mapping->v4l2_type != V4L2_CTRL_TYPE_BITMASK)
 		v4l2_ctrl->minimum = mapping->get(mapping, UVC_GET_MIN,
 				     uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MIN));
 
@@ -1164,7 +1165,8 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 		v4l2_ctrl->maximum = mapping->get(mapping, UVC_GET_MAX,
 				     uvc_ctrl_data(ctrl, UVC_CTRL_DATA_MAX));
 
-	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES)
+	if (ctrl->info.flags & UVC_CTRL_FLAG_GET_RES &&
+	    mapping->v4l2_type != V4L2_CTRL_TYPE_BITMASK)
 		v4l2_ctrl->step = mapping->get(mapping, UVC_GET_RES,
 				  uvc_ctrl_data(ctrl, UVC_CTRL_DATA_RES));
 
-- 
2.34.1.400.ga245620fadb-goog