>> i use kernel 2.6.7 with both uhci/ehci and ohci controllers on smp
>> box.
>>
>> i have two very infrequent bugs (once or twice a month for me).
>> 
>> first bug with usb-connected palmos based PDA (like  palm tungsten).
>> i use usbfs (libusb) for access to the usb devices (i don't use kernel
>> visor module).
>> you can see kernel output in kern.log

AS> I don't know what's causing this problem.  Maybe it has been fixed in 
AS> 2.6.8-rc4.

ok, i try use 2.6.8 after release

>> second bug with ftdi usb/serial converter. you can see kernel output
>> in kern1.log

AS> This is a known bug.  It happens sometimes when you rmmod one of the USB
AS> host controller drivers while devices are plugged in and in use by usbfs.  
AS> To avoid this bug, either don't rmmod ohci_hcd or else stop all processes 
AS> using a USB device first.

i do rmmod only if usb subsystem stop working.

oops is infrequent - sometimes rmmod help, sometimes rmmod don't
respond and i do reboot. 

how can i determine problem source instead do rmmod/modprobe or reboot?



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