Bin Liu <b-liu@xxxxxx> writes: >> > > Why doesn't the same problem occur with other types of host controller? >> > >> > Not sure, I am on musb for most of the times. Maybe other HCD doesn't >> > giveback URBs with -EPROTO in such error case. >> >> ehci-hcd also uses -EPROTO. > > Is it possible to test the use case on ehci? > > - connect a multi-ports usb serial device to a hub; > - open multiple ports with cat command; > - remove the usb serial device from the hub; > - console lockup happens? It doesn't seem to happen using ehci or even musb on Allwinner A20. I have only seen the problem with musb on AM3358. -- Måns Rullgård
