| Message ID | 20210311221946.1319924-5-ribalda@chromium.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | uvcvideo: Fix v4l2-compliance errors | expand |
On 11/03/2021 23:19, Ricardo Ribalda wrote: > According to the doc: > The, in hindsight quite poor, solution for that is to set error_idx to > count if the validation failed. I think this needs a bit more explanation. How about this: "If an error is found when validating the list of controls passed with VIDIOC_G_EXT_CTRLS, then error_idx shall be set to ctrls->count to indicate to userspace that no actual hardware was touched. It would have been much nicer of course if error_idx could point to the control index that failed the validation, but sadly that's not how the API was designed." > > Fixes v4l2-compliance: > Control ioctls (Input 0): > fail: v4l2-test-controls.cpp(645): invalid error index write only control > test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL > > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> After improving the commit log you can add my: Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Thanks! Hans > --- > drivers/media/usb/uvc/uvc_v4l2.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c > index 157310c0ca87..36eb48622d48 100644 > --- a/drivers/media/usb/uvc/uvc_v4l2.c > +++ b/drivers/media/usb/uvc/uvc_v4l2.c > @@ -1073,7 +1073,8 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh, > ret = uvc_ctrl_get(chain, ctrl); > if (ret < 0) { > uvc_ctrl_rollback(handle); > - ctrls->error_idx = i; > + ctrls->error_idx = (ret == -EACCES) ? > + ctrls->count : i; > return ret; > } > } >
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 157310c0ca87..36eb48622d48 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -1073,7 +1073,8 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh, ret = uvc_ctrl_get(chain, ctrl); if (ret < 0) { uvc_ctrl_rollback(handle); - ctrls->error_idx = i; + ctrls->error_idx = (ret == -EACCES) ? + ctrls->count : i; return ret; } }
According to the doc: The, in hindsight quite poor, solution for that is to set error_idx to count if the validation failed. Fixes v4l2-compliance: Control ioctls (Input 0): fail: v4l2-test-controls.cpp(645): invalid error index write only control test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> --- drivers/media/usb/uvc/uvc_v4l2.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)