linux-kernel - [PATCH v3 3/8] media: uvcvideo: Return -EIO for control errors

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Message-Id: <20210312124830.1344255-4-ribalda@chromium.org>
Date:   Fri, 12 Mar 2021 13:48:25 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, senozhatsky@...omium.org,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     Ricardo Ribalda <ribalda@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Subject: [PATCH v3 3/8] media: uvcvideo: Return -EIO for control errors

The device is doing something unspected with the control. Either because
the protocol is not properly implemented or there has been a HW error.

Fixes v4l2-compliance:

Control ioctls (Input 0):
                fail: v4l2-test-controls.cpp(448): s_ctrl returned an error (22)
        test VIDIOC_G/S_CTRL: FAIL
                fail: v4l2-test-controls.cpp(698): s_ext_ctrls returned an error (22)
        test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_video.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index f2f565281e63..25fd8aa23529 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -112,6 +112,11 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
 	case 5: /* Invalid unit */
 	case 6: /* Invalid control */
 	case 7: /* Invalid Request */
+		/*
+		 * The firmware has not properly implemented
+		 * the control or there has been a HW error.
+		 */
+		return -EIO;
 	case 8: /* Invalid value within range */
 		return -EINVAL;
 	default: /* reserved or unknown */
-- 
2.31.0.rc2.261.g7f71774620-goog