Bin Liu <b-liu@xxxxxx> writes: > 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? Could you be a little more specific? I'm happy to run some tests, but I need to know what information you're looking for. -- Måns Rullgård
