sbp2: modprobe -r fails, module allegedly in use

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

Hi all,

it seems the sbp2 driver module can never be unloaded because the
module "is in use" even though all SBP-2 devices were physically removed
(after umount etc.). I believe it is an old problem of the last few 2.6
kernels but am not sure when it was really introduced.

One thing can easily be spotted by "ps x": The scsi_error_handler of an
SBP-2 device does not exit. The /sys/bus/scsi/devices/$a:$b:$c:$d 
vanished, the /sys/bus/ieee1394/devices/$guid-$unit too, but the 
scsi_eh_# daemon is still there. It seems shost->shost_gendev.release 
was never called.

So I just added a few more scsi_host_put() to sbp2_remove_device(). 
scsi_eh_# now goes away when I disconnect the device. Still, modprobe -r 
sbp2 fails with "FATAL: Module sbp2 is in use.".
-- 
Stefan Richter
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http://arcgraph.de/sr/