(Originally posted to linux-usb-users)
I am developing an application which uses multiple XM Satellite Radio PC receivers, which interface to the system using an FTDI 8U232AM (or compatible, anyway) USB-to-serial chip. These are connected to an IBM eServer X-Series 345 computer running Red Hat Linux 9. I've tried both the ServerWorks OHCI USB controller on the motherboard and on an add-in ALI chip-based USB 2.0 OHCI/EHCI PCI card. I've also tried both the standard Red Hat kernel version, and with some of the latest USB code (including usb.c, usbserial.c, and ftdi_sio.c) from 2.4.27-pre2 patched in. In each of these cases I'm seeing the same problem:
I've got a task doing blocking reads (in separate threads) on each USB serial port. It works fine for a while, but then eventually (15-30 minutes or so), the reads seem to hang one by one, and no more data is received on those ports. But if we close and reopen the device, we seem to get all the data that was received by the chip while it was hung (well, unless it overflowed its buffer in the meantime). Looking at the output in the dmesg with debug=1 on the ftdi_sio module, it seems like we stop getting read_bulk_callbacks on the port that is hung. There are no other USB errors, etc. that accompany this.
I've made some changes to the ftdi_sio driver to implement a timer that gets restarted every time the read URB bulk callback is received. If we don't get a callback within a certain time after submitting the URB (HZ/10 jiffies presently), it unlinks the read URB and re-submits it. That seems to work around the problem fairly effectively. However, I'm pretty much at a loss to explain why the URB stops coming back in the first place. It could be some kind of hardware problem that is being triggered somehow, or maybe some bug in the USB core or host controller code somewhere? Any insight that anyone can provide would be appreciated.
Please CC me directly on replies if possible.
Contents of /proc/bus/usb/devices follow:
T: Bus=05 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 6 B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 2.04 S: Manufacturer=Linux 2.4.20-31.9usbmod ehci-hcd S: Product=ALi Corporation. [ALi] USB 2.0 Controller S: SerialNumber=00:05.3 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=256ms T: Bus=04 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 4 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB OHCI Root Hub S: SerialNumber=f888f000 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=03 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB OHCI Root Hub S: SerialNumber=f888d000 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 2.00 S: Manufacturer=FTDI S: Product=USB <-> Serial S: SerialNumber=12345678 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 90mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=serial 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#= 5 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 2.00 S: Manufacturer=FTDI S: Product=USB <-> Serial S: SerialNumber=12345678 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 90mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=serial E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB OHCI Root Hub S: SerialNumber=f888b000 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=02 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 3 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 2.00 S: Manufacturer=FTDI S: Product=USB <-> Serial S: SerialNumber=12345678 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 90mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=serial E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms T: Bus=02 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 4 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 2.00 S: Manufacturer=FTDI S: Product=USB <-> Serial S: SerialNumber=12345678 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 90mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=serial E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms T: Bus=02 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 4 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0403 ProdID=6001 Rev= 2.00 S: Manufacturer=FTDI S: Product=USB <-> Serial S: SerialNumber=12345678 C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr= 90mA I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=serial E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 0.00 S: Product=USB OHCI Root Hub S: SerialNumber=f8889000 C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
-- Robert Hancock Programmer SED Systems Email: [EMAIL PROTECTED]
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