Hi, When making a VIDIOC_QUERYCTRL ioctl( ) call on a UVC video capture device (USB camera), occasionally I get an Input/Output error (errno=5, EIO). However, it is not defined as a possible returned error either in the VIDIOC_QUERYCTRL docs here https://linuxtv.org/downloads/v4l-dvb-apis/uapi/v4l/vidioc-queryctrl.html , nor as a generic error for ioctl( ) calls or for v4l2 calls. After digging in the code, it looks that this ioctl( ) eventually makes a USB request and calls usb_start_wait_urb( ), which, I guess, is what ends up returning EIO if something goes wrong. So my question is, shouldn't this be documented in the link above? At least for the UVC case? Luis -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
