Re: Deadlock v3.10.35 with FTD_SIO usb-serial adapter

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On Wed, 16 Apr 2014, Matteo Fortini wrote:

> It's and AMD Geode single board computer, using CS5535 companion chip.
> 
> Here's the pertaining lspci -vvv section:
> 
> 00:0f.4 Class 0c03: Device 1022:2094 (rev 02) (prog-if 10)
>      Subsystem: Device 1022:2094
>      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: 0, Cache Line Size: 32 bytes
>      Interrupt: pin D routed to IRQ 11
>      Region 0: Memory at efffd000 (32-bit, non-prefetchable) [size=4K]
>      Capabilities: [40] 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-
>      Kernel driver in use: ohci-pci
> 
> 00:0f.5 Class 0c03: Device 1022:2095 (rev 02) (prog-if 20)
>      Subsystem: Device 1022:2095
>      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: 0, Cache Line Size: 32 bytes
>      Interrupt: pin D routed to IRQ 11
>      Region 0: Memory at efffc000 (32-bit, non-prefetchable) [size=4K]
>      Capabilities: [40] 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-
>      Kernel driver in use: ehci-pci

This doesn't answer my question.  Which controller was the device 
attached to when the hang occurred?  Was it the EHCI controller or the 
OHCI controller?

If you enable CONFIG_USB_DEBUG, what shows up in the files under the
corresponding directory in /sys/kernel/debug/usb/ehci/ or
/sys/kernel/debug/usb/ohci/ when the hang occurs?

Alan Stern

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