Hi, While working on my cleanup / v4l2 compliance series for the pwc driver I've noticed that the pwc and gspca drivers are doing different things wrt what error they return to an app is using the device while it gets unplugged. gspca returns -ENODEV, where as pwc returns -EPIPE. Both make some sense. I've not looked at what other usb (or other hotplug capable bus) v4l2 drivers do, but it makes sense to me to standardize on an error here, preferably a reasonable unique one so that apps can detect unplug versus other errors. Note that the usb subsystem returns -ENODEV when you try to (re)submit an urb from its completion handler, when that completion handler gets called because the urb was unlinked because of device unplug. Given that we often return usb error codes unmodified and the usb subsys uses -ENODEV for trying to do things with unplugged devices, I guess it makes sense for us to also use -ENODEV. Regards, Hans -- 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
