-----linux-usb-owner@xxxxxxxxxxxxxxx wrote: ----- >Which of these three FTDI devices is the one that's hanging? These two are causing problems. T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 6.00 S: Manufacturer=FTDI S: Product=FT232R USB UART S: SerialNumber=A600e2CA C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 90mA I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=ftdi_sio E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=12 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 6.00 S: Manufacturer=FTDI S: Product=FT232R USB UART S: SerialNumber=A600bjV2 C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr= 90mA I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=ftdi_sio E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms >> Server ~ # cat /sys/kernel/debug/usb/ohci/0000\:00\:02.0/async >> cat: /sys/kernel/debug/usb/ohci/0000:00:02.0/async: Operation not >permitted > >That's very suspicious. In fact, I can't imagine how it happened. >Does the file not have read permission? > >Probably the information we need is buried in that file... Server ~ # cd /sys/kernel/debug/usb/ Server usb # ls -al total 0 drwxr-xr-x 5 root root 0 Nov 17 20:46 . drwxr-xr-x 13 root root 0 Nov 17 20:46 .. -r--r--r-- 1 root root 0 Nov 17 20:46 devices drwxr-xr-x 4 root root 0 Nov 17 20:46 ehci drwxr-xr-x 4 root root 0 Nov 17 20:46 ohci drwxr-xr-x 2 root root 0 Nov 17 20:46 usbmon Server usb # cd ohci/ Server ohci # ls -al total 0 drwxr-xr-x 4 root root 0 Nov 17 20:46 . drwxr-xr-x 5 root root 0 Nov 17 20:46 .. drwxr-xr-x 2 root root 0 Nov 17 20:46 0000:00:02.0 drwxr-xr-x 2 root root 0 Nov 17 20:46 0000:00:04.0 Server ohci # ls -al 0000\:00\:02.0/ total 0 drwxr-xr-x 2 root root 0 Nov 17 20:46 . drwxr-xr-x 4 root root 0 Nov 17 20:46 .. -r--r--r-- 1 root root 0 Nov 17 20:46 async -r--r--r-- 1 root root 0 Nov 17 20:46 periodic -r--r--r-- 1 root root 0 Nov 17 20:46 registers Server ohci # ls -al 0000\:00\:04.0/ total 0 drwxr-xr-x 2 root root 0 Nov 17 20:46 . drwxr-xr-x 4 root root 0 Nov 17 20:46 .. -r--r--r-- 1 root root 0 Nov 17 20:46 async -r--r--r-- 1 root root 0 Nov 17 20:46 periodic -r--r--r-- 1 root root 0 Nov 17 20:46 registers Server ohci # >Here's something else you can try as well. Make sure CONFIG_USB_MON >is enabled, and record a usbmon trace for the bus with the device >that >causes the hang. Instructions are in the kernel source file >Documentation/usb/usbmon.txt. Okay. This is the trace while the port (Bus=03 Port=01) is already in the "hang" state: ffff880085eb4240 2800006305 S Co:3:003:0 s 40 09 0001 0000 0000 0 ffff880085eb4240 2805006485 C Co:3:003:0 -2 0 ffff880085eb4240 2805006514 S Co:3:003:0 s 40 00 0000 0000 0000 0 ffff880085eb4240 2810006333 C Co:3:003:0 -2 0 ffff880085eb4240 2810006365 S Co:3:003:0 s 40 04 1208 0000 0000 0 ffff880085eb4240 2811006302 C Co:3:003:0 -2 0 ffff880085eb4240 2811006337 S Co:3:003:0 s 40 03 809c 0000 0000 0 ffff880085eb4240 2812006271 C Co:3:003:0 -2 0 ffff880085eb4240 2812006304 S Co:3:003:0 s 40 02 0000 0000 0000 0 ffff880085eb4240 2817006112 C Co:3:003:0 -2 0 ffff880085eb4240 2817006135 S Co:3:003:0 s 40 01 0300 0000 0000 0 ffff880085eb4240 2822005959 C Co:3:003:0 -2 0 ffff88013e343840 2822005973 S Bi:3:003:1 -115 512 < ffff880085eb4240 2822005984 S Co:3:003:0 s 40 01 0303 0000 0000 0 ffff880085eb4240 2827006818 C Co:3:003:0 -2 0 ffff880085eb4240 2827006880 S Co:3:003:0 s 40 04 1208 0000 0000 0 ffff880085eb4240 2828006776 C Co:3:003:0 -2 0 ffff880085eb4240 2828006807 S Co:3:003:0 s 40 03 809c 0000 0000 0 ffff880085eb4240 2829006744 C Co:3:003:0 -2 0 ffff880085eb4240 2829006762 S Co:3:003:0 s 40 02 0000 0000 0000 0 ffff880085eb4240 2834007599 C Co:3:003:0 -2 0 ffff880085eb4240 2834007638 S Co:3:003:0 s 40 01 0300 0000 0000 0 ffff880085eb4240 2839008447 C Co:3:003:0 -2 0 ffff880085eb4240 2839008502 S Co:3:003:0 s 40 04 1208 0000 0000 0 ffff880085eb4240 2840008416 C Co:3:003:0 -2 0 ffff880085eb4240 2840008452 S Co:3:003:0 s 40 03 809c 0000 0000 0 ffff880085eb4240 2841008386 C Co:3:003:0 -2 0 ffff880085eb4240 2841008420 S Co:3:003:0 s 40 02 0000 0000 0000 0 ffff880085eb4240 2846008225 C Co:3:003:0 -2 0 ffff880085eb4240 2846008249 S Co:3:003:0 s 40 01 0300 0000 0000 0 ffff880085eb4240 2851008071 C Co:3:003:0 -2 0 ffff880085eb4240 2851008098 S Ci:3:003:0 s c0 05 0000 0000 0002 2 < ffff880085eb4240 2856007942 C Ci:3:003:0 -2 0 ffff88001ffcf3c0 2856007974 S Co:3:003:0 s 40 01 0300 0000 0000 0 ffff88001ffcf3c0 2861007768 C Co:3:003:0 -2 0 ffff880085e1f6c0 2861007807 S Ci:3:003:0 s c0 05 0000 0000 0002 2 < ffff880085e1f6c0 2866008844 C Ci:3:003:0 -2 0 ffff880085f80c00 2866008868 S Co:3:003:0 s 40 01 0302 0000 0000 0 ffff880085f80c00 2871009470 C Co:3:003:0 -2 0 ffff880085f809c0 2871099598 S Ci:3:003:0 s c0 05 0000 0000 0002 2 < ffff880085f809c0 2876099316 C Ci:3:003:0 -2 0 ffff880085f809c0 2876099360 S Co:3:003:0 s 40 01 0301 0000 0000 0 ffff880085f809c0 2881099153 C Co:3:003:0 -2 0 ffff880085f809c0 2881099187 S Ci:3:003:0 s c0 05 0000 0000 0002 2 < ffff880085f809c0 2886099002 C Ci:3:003:0 -2 0 ffff880085f809c0 2886099026 S Co:3:003:0 s 40 01 0301 0000 0000 0 ffff880085f809c0 2891098850 C Co:3:003:0 -2 0 Regards. David -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
