usbserial behaviour in kernels 2.6.34 <-> 2.6.37

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Hello,


I access external hardware thru usbserial:

# modprobe usbserial vendor=0xNNNN product=0xN

With kernel 2.6.34 (version 2.6.34.8-0.2-default,
OpenSUSE 11.3) it was possible to remove usbserial
without physically disconnecting this device:

# modprobe -r usbserial

With kernel 2.6.37 (version 2.6.37.6-0.5-default,
OpenSUSE 11.4) this no longer works, removal of
usbserial fails with:

# modprobe -r usbserial
FATAL: Module usbserial is in use.

The device needs to be disconnected before removal
of the module succeeds. Is there an option to get
back the original (2.6.34) behaviour?


Thanks

Georg
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