uhci_hcd: host system error

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Hello all,
I am using kernel 2.6.20-16 (Ubuntu Feisty). Occasionally I am getting USB host controller halts. If I manually remove and reinsert the uhci_hcd module, everything is back to normal. I recompiled the kernel with the CONFIG_USB_DEBUG option on and waited until a halt occurred. The devices I had connected were: 

Bus 005 Device 002: ID eb1a:2750 eMPIA Technology, Inc.
Bus 005 Device 001: ID 0000:0000 Bus 004 Device 003: ID 045e:008c Microsoft Corp. Wireless Intellimouse Explorer 2.0 Bus 004 Device 001: ID 0000:0000 Bus 003 Device 001: ID 0000:0000 Bus 002 Device 001: ID 0000:0000 Bus 001 Device 001: ID 0000:0000 
The entry in the syslog indicating the halt are the following:
Jun 4 16:00:53 localhost kernel: [ 355.820000] uhci_hcd 0000:00:1d.3: host system error, PCI problems? Jun 4 16:00:53 localhost kernel: [ 355.820000] uhci_hcd 0000:00:1d.3: host controller halted, very bad! Jun 4 16:00:53 localhost kernel: [ 355.820000] uhci_hcd 0000:00:1d.3: HC died; cleaning up Jun 4 16:00:53 localhost kernel: [ 355.820000] hub 4-0:1.0: state 0 ports 2 chg 0000 evt 0000 Jun 4 16:00:53 localhost kernel: [ 355.820000] usb 4-1: USB disconnect, address 2 Jun 4 16:00:53 localhost kernel: [ 355.820000] usb 4-1: unregistering device Jun 4 16:00:53 localhost kernel: [ 355.820000] usb 4-1: usb_disable_device nuking all URBs Jun 4 16:00:53 localhost kernel: [ 355.820000] uhci_hcd 0000:00:1d.3: shutdown urb dfc4a840 pipe 40408280 ep1in-intr Jun 4 16:00:53 localhost kernel: [ 355.824000] usb 4-1: unregistering interface 4-1:1.0 Jun 4 16:00:53 localhost kernel: [ 355.824000] usbdev4.2_ep81: ep_device_release called for usbdev4.2_ep81 
Jun  4 16:00:53 localhost kernel: [  355.824000] usb 4-1:1.0: uevent
Jun 4 16:00:53 localhost kernel: [ 355.824000] usbdev4.2_ep00: ep_device_release called for usbdev4.2_ep00 
Jun  4 16:00:53 localhost kernel: [  355.824000] usb 4-1: uevent
I also used debugfs to monitor to status of the hubs. After the halt, the 0000:00:1d.3 had the following content: 

Root-hub state: reset   FSBR: 0
HC status
 usbcmd    =     0000   Maxp32
 usbstat   =     0020   HCHalted
 usbint    =     0000
 usbfrnum  =   (0)000
 flbaseadd = 1fd04000
 sof       =       40
 stat1     =     01a3   LowSpeed ConnectChange Connected
stat2 = 0080 Most recent frame: 54cb9 (185) Last ISO frame: 54cb9 (185) 

After the manual reset of the host controllers, the file contained

Root-hub state: running   FSBR: 0
HC status
 usbcmd    =     00c1   Maxp64 CF RS
usbstat = 0000 usbint = 000f 
 usbfrnum  =   (1)ef0
 flbaseadd = 1acf4ef0
 sof       =       40
 stat1     =     01a5   LowSpeed Enabled Connected
stat2 = 0080 Most recent frame: 2b76f (879) Last ISO frame: 2b76f (879)
I don't think that the device connected actually matters, because I have had the same halts with different devices. Here is the relevant output from lspci -vv:
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #1 (rev 02) (prog-if 00 [UHCI]) 
   Subsystem: Elitegroup Computer Systems Unknown device 0f69
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- 
   Latency: 0
   Interrupt: pin A routed to IRQ 19
   Region 4: I/O ports at ec00 [size=32]
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #2 (rev 02) (prog-if 00 [UHCI]) 
   Subsystem: Elitegroup Computer Systems Unknown device 0f69
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- 
   Latency: 0
   Interrupt: pin B routed to IRQ 20
   Region 4: I/O ports at e880 [size=32]
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #3 (rev 02) (prog-if 00 [UHCI]) 
   Subsystem: Elitegroup Computer Systems Unknown device 0f69
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- 
   Latency: 0
   Interrupt: pin C routed to IRQ 21
   Region 4: I/O ports at e800 [size=32]
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI #4 (rev 02) (prog-if 00 [UHCI]) 
   Subsystem: Elitegroup Computer Systems Unknown device 0f69
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- 
   Latency: 0
   Interrupt: pin D routed to IRQ 22
   Region 4: I/O ports at e480 [size=32]
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02) (prog-if 20 [EHCI]) 
   Subsystem: Elitegroup Computer Systems Unknown device 0f69
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- 
   Latency: 0
   Interrupt: pin C routed to IRQ 21
   Region 0: Memory at ffefbc00 (32-bit, non-prefetchable) [size=1K]
   Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+) 
       Status: D0 PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [58] Debug port
Can anyone suggest what the problem could be? Could I hope for any fix (or a quirk), which could overcome the crashes? 

When replying, please CC: my email. Thank you.

Trifon Trifonov
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