On Fri, 8 Jun 2012, Huajun Li wrote: > > If so, looks mistaken value is returned from the host controller driver, > > but not sure if your device is buggy. What is your host controller? > > > Nothing related to HC. > I tried to find out the endpoint state, but found it was halt. I think > this is the root cause. No, it isn't. Endpoint halt causes a -EPIPE error, not -EPROTO. -EPROTO indicates that the device's firmware has crashed. > What's your opinion to handle "-EPROTO" error in usbnet.c? > Please check usbnet.c again, when "-EPROTO" occurs, it just pints > error msg and re-submit the interrupt URB, and then causes endless > "EactErr" error msg. One possibility is to wait for a little while before resubmitting the URB, and after 10 failures in a row, attempt a reset. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
