On Thu, Jan 24, 2019 at 12:56:33PM +0000, Måns Rullgård wrote: > 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. Can you please debug it to see how the hub disconnect event got a chance to be processed? Regards, -Bin.
