The driver does not support it.

Fixes v4l2-compliance:

Buffer ioctls (Input 0):
                fail: v4l2-test-buffers.cpp(1925): ret != EINVAL && ret != 
EBADR && ret != ENOTTY
        test Requests: FAIL

Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
---
 drivers/media/usb/uvc/uvc_v4l2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 252136cc885c..5e3ec4a376e4 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1046,6 +1046,9 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void 
*fh,
        unsigned int i;
        int ret;
 
+       if (ctrls->which == V4L2_CTRL_WHICH_REQUEST_VAL)
+               return -EINVAL;
+
        if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
                for (i = 0; i < ctrls->count; ++ctrl, ++i) {
                        struct v4l2_queryctrl qc = { .id = ctrl->id };
-- 
2.31.0.rc2.261.g7f71774620-goog

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