On Fri, 25 May 2012, Hans de Goede wrote: > > Judging by your description, there is a bug either in xhci-hcd or in > > your xHCI hardware. What does "lspci -vv" show for the controller? > > 01:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller > (rev 04) (prog-if 30 [XHCI]) > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- > Stepping- SERR- FastB2B- DisINTx+ > Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- > <TAbort- <MAbort- >SERR- <PERR- INTx- > Latency: 0, Cache Line Size: 64 bytes > Interrupt: pin A routed to IRQ 16 > Region 0: Memory at fe600000 (64-bit, non-prefetchable) [size=8K] > Capabilities: <access denied> > Kernel driver in use: xhci_hcd
As far as I know, the NEC controllers have been very reliable. > But I don't believe this is hardware specific, I started investigating this > after a bug report from a user of my USB redirection code, that user > was seeing this with a thinkpad W510. I'll ask an lsusb -vv from him too, > just in case that model has the exact same hardware. > > I'm thinking that maybe the issue is that the EREMOTEIO error gets generated > by the driver based on the SHORT_NOT_OK flag (or so I believe), not the hc > itself, could it be that the code doing that does not halt the ep, or halts > it too late? Well, the EREMOTEIO error is _supposed_ to be generated by the controller. That is, the hardware is supposed to recognize it as an exceptional case and stop the endpoint queue. Sarah knows the answers; she's the xhci-hcd maintainer. Anything I said about it would just be speculation. Alan Stern ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
