On Tue, 4 Feb 2020, Lauri Jakku wrote: > -- v1 ------------------------------------------------------------ > send, 20ms apart, control messages, if error is timeout. > > There is multiple reports of random behaviour of USB HID devices. > > I have mouse that acts sometimes quite randomly, I debugged with > logs others have published that there is HW timeouts that leave > device in state that it is errorneus. > > To fix this I introduced retry mechanism in root of USB HID drivers. > > Fix does not slow down operations at all if there is no -ETIMEDOUT > got from control message sending. If there is one, then sleep 20ms > and try again. Retry count is 20 witch translates maximium of 400ms > before giving up. > > NOTE: This does not sleep anymore then before, if all is golden. How do other operating systems handle these problems? Perhaps we should use the same approach. Also, if this problem only affects USB HID devices, why not put the fix in the usbhid driver rather than the USB core? Alan Stern
