[Linux-usb-users] System hangs up with USB 2.0 and mass storage

[ALBERTO D SCOTTI]

I have been trying to add an external hard drive using USB 2.0
The box is a dual Athlon, with a Tyan mb (thunder). It runs RH 8.0
(2.4.18-14smp), but I had the same problem after upgrading to 2.4.20.
I have tried all possible permutation of 2 controllers (vt6202 and NEC) and
2 kind of HD (Maxtor and generic based on a ACER IDE to USB chipset).
The problem is the following: ehci-hcd recognizes the controller without a glitch.
When I plug in the HD, usb-storage correctly identifies it and attach it to the
appropriate scsi emulation device. I was able to create the partitions and format
the disk (either ext3 of reiserfs). So far so good. Trouble starts when I start moving
files to and from the disk. It works for some time (a few minutes, equivalent to 1 or 2 Gb).
Then, first the disk stop working, say during a transfer. After approximatively 30 seconds, the
whole system freezes and I need to to do a hard reboot. With the 2.4.20 modules compiled with
the debug option on, the last two lines that I read out of dmesg are

usb-controller: Bulk data transfer result 0x0
usb-controller: attempting to get CSW


Things that I have tried and did not work
1) Boot in single CPU mode
2) Boot with the noapic command appended
3) Set the smp_affinity so that only one cpu services the interrupt requests of ehci-hcd
4) Set the MP version to 1.1 in the bios.

This is a production system, so I am reluctant in doing any extensive testing without some guidance.
Any help is appreciated.


--
Alberto Scotti
Asst. Prof.
Dept. of Marine Sciences
CB 3300
University of North Carolina
Chapel Hill, NC 27599-3300
919-962-9454 (w)
919-962-1254 (f)




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