Johan Hovold <johan@xxxxxxxxxx> writes: > On Wed, Jan 23, 2019 at 08:50:38PM +0000, Måns Rullgård wrote: >> 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. > > The A20 being dual core may possible explain the difference. Booting the A20 with nosmp it still works correctly. -- Måns Rullgård
