[PATCH] ieee1394/sbp2: fixes for hot-unplug and module unloading

Fixes for reference counting problems, deadlocks, and delays when SBP-2 devices
are unplugged or unbound from sbp2, or when unloading of sbp2/ ohci1394/ pcilynx
is attempted.

Most often reported symptoms were hotplugs remaining undetected once a FireWire
disk was unplugged since the knodemgrd kernel thread went to uninterruptible
sleep, and "modprobe -r sbp2" being unable to complete because still being in
use.

Patch is equivalent to commit abd559b1

 in
2.6.14-rc3 plus a fix which is necessary together with 2.6.13's scsi core API
(linux1394.org commit r1308 by Ben Collins).

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: Ben Collins <bcollins@debian.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>