| Message ID | 20241128-uvc-readless-v5-2-cf16ed282af8@chromium.org |
|---|---|
| State | New |
| Headers | show |
| Series | media: uvcvideo: Support partial control reads and minor changes | expand |
On Thu, Nov 28, 2024 at 08:53:42PM +0000, Ricardo Ribalda wrote: > If we fail to query the ctrl error code there is no information on dmesg s/ctrl/control/ > or in uvc_dbg. This makes difficult to debug the issue. > > Print a proper error message when we cannot retrieve the error code from > the device. > > Reviewed-by: Hans de Goede <hdegoede@redhat.com> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> I'll update the commit message, no need to resend. > --- > drivers/media/usb/uvc/uvc_video.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c > index 67f714bca417..a650d886e922 100644 > --- a/drivers/media/usb/uvc/uvc_video.c > +++ b/drivers/media/usb/uvc/uvc_video.c > @@ -117,8 +117,12 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit, > error = *(u8 *)data; > *(u8 *)data = tmp; > > - if (ret != 1) > + if (ret != 1) { > + dev_err_ratelimited(&dev->udev->dev, > + "Failed to query (%s) UVC error code control %u on unit %u: %d (exp. 1).\n", > + uvc_query_name(query), cs, unit, ret); > return ret < 0 ? ret : -EPIPE; > + } > > uvc_dbg(dev, CONTROL, "Control error %u\n", error); >
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 67f714bca417..a650d886e922 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -117,8 +117,12 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit, error = *(u8 *)data; *(u8 *)data = tmp; - if (ret != 1) + if (ret != 1) { + dev_err_ratelimited(&dev->udev->dev, + "Failed to query (%s) UVC error code control %u on unit %u: %d (exp. 1).\n", + uvc_query_name(query), cs, unit, ret); return ret < 0 ? ret : -EPIPE; + } uvc_dbg(dev, CONTROL, "Control error %u\n", error);