Am Mittwoch, den 04.03.2020, 14:11 +0200 schrieb Mathias Nyman: > On 3.3.2020 22.08, Jonas Karlsson wrote: > > I recently got a report about a bit similar issue on a 4.4 stable kernel, so this > might not be xhci-cdns specific. > > That case involved autosuspend of the cdc-acm, and there was only a short burst of > transaction erros and resubmitted URBs even if the device was supposed to be suspended. > It looks like cdc_acm autosuspended even if it had URBs pending. That must not happen. Do you have details? > I'm guessing that in that case the transfer ring restarted even if link was already "suspeded", > causing transaction errors. Ring could be restarted if URBs were resubmitted > by the class driver when usb core suspends all interfaces, flushing all pending URBs which > calls the URB completion handler. How should a class driver do that? It gets -EPROTO and that's it, Regards Oliver
