[PATCH v8 04/19] media: v4l2-ioctl: S_CTRL output the right value

[Ricardo Ribalda]

If the driver does not implement s_ctrl, but it does implement
s_ext_ctrls, we convert the call.

When that happens we have also to convert back the response from
s_ext_ctrls.

Fixes v4l2_compliance:
Control ioctls (Input 0):
                fail: v4l2-test-controls.cpp(411): returned control value out 
of range
                fail: v4l2-test-controls.cpp(507): invalid control 00980900
        test VIDIOC_G/S_CTRL: FAIL

Fixes: 35ea11ff8471 ("V4L/DVB (8430): videodev: move some functions from 
v4l2-dev.h to v4l2-common.h or v4l2-ioctl.h")
Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
---
 drivers/media/v4l2-core/v4l2-ioctl.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c 
b/drivers/media/v4l2-core/v4l2-ioctl.c
index 7b5ebdd329e8..b8f73a48872b 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -2266,6 +2266,7 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
                test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
        struct v4l2_ext_controls ctrls;
        struct v4l2_ext_control ctrl;
+       int ret;
 
        if (vfh && vfh->ctrl_handler)
                return v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
@@ -2281,9 +2282,11 @@ static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
        ctrls.controls = &ctrl;
        ctrl.id = p->id;
        ctrl.value = p->value;
-       if (check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
-               return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
-       return -EINVAL;
+       if (!check_ext_ctrls(&ctrls, VIDIOC_S_CTRL))
+               return -EINVAL;
+       ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
+       p->value = ctrl.value;
+       return ret;
 }
 
 static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
-- 
2.31.0.rc2.261.g7f71774620-goog