On Fri, Jul 10, 2009 at 7:32 AM, Ian Lynagh<igloo@xxxxxxxx> wrote: > > Hi all, > > [1.] PROBLEM: USB wlan device stops working; ehci "kernel BUG" > > [2.] > > I am having a problem with an rt73usb and/or ehci. I /think/ the bug is > in ehci, and the rt73usb problems are just a symptom, but I'm not sure. > > The actual problem is that after a while (generally a few days, I think) > my USB wireless device stops working. I've attached the dmesg log at the > point that I noticed it stopped working today; unfortunately, I don't > know exactly when it broke. My guess is it was at this line, though: > > [582576.209231] ehci_hcd 0000:00:12.2: force halt; handhake ffffc20000636024 00004000 00000000 -> -110 > Hi I've seen this too. Once the "handhake" error happens, the ehci controller is off line until a reboot. Connect/disconnect is no longer detected on any port. I did not try to see if rmmod/insmod for echi fixed the problem. I caused it with a very heavy bulk load (flash to flash copy), and then lots of control traffic to another device (a scanner and once a webcam) while the third device was starting up. It seemed very timing sensitive. <snip> > 00:12.2 USB Controller: ATI Technologies Inc SB700/SB800 USB EHCI Controller (prog-if 20 [EHCI]) > Subsystem: Giga-byte Technology Device 5004 > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- > Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > Latency: 32, Cache Line Size: 64 bytes > Interrupt: pin B routed to IRQ 17 > Region 0: Memory at fe02c000 (32-bit, non-prefetchable) [size=256] > Capabilities: [c0] Power Management version 2 > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold-) > Status: D0 PME-Enable- DSel=0 DScale=0 PME- > Bridge: PM- B3+ > Capabilities: [e4] Debug port: BAR=1 offset=00e0 > Kernel driver in use: ehci_hcd > Kernel modules: ehci-hcd > And this is the southbridge where I had the problem, too. On an earlier kernel someone at AMD presented some patches to ehci for the sb600 and sb700 which had some startup hang problems. I think they will need to be consulted for a workaround for this problem. I no longer have access to the system where I ran into the problem, so I cannot give more details, sorry. Regards, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
