Thread (50 messages) 50 messages, 5 authors, 2021-06-10
STALE1850d REVIEWED: 22 (21M)
Revisions (6)
  1. v4 [diff vs current]
  2. v5 [diff vs current]
  3. v6 [diff vs current]
  4. v7 [diff vs current]
  5. v8 [diff vs current]
  6. v9 current

[PATCH v9 07/22] media: uvcvideo: Return -EIO for control errors

From: Ricardo Ribalda <hidden>
Date: 2021-03-26 09:59:35
Also in: lkml
Subsystem: media input infrastructure (v4l/dvb), the rest, usb video class · Maintainers: Mauro Carvalho Chehab, Linus Torvalds, Laurent Pinchart, Hans de Goede

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@ideasonboard.com>
Reviewed-by: Hans Verkuil <redacted>
Signed-off-by: Ricardo Ribalda <redacted>
---
 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 */
-- 
2.31.0.291.g576ba9dcdaf-goog
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