From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Sat, 3 Feb 2007 15:48:51 +0000 (+0100)
Subject: ieee1394: raw1394: prevent unloading of low-level driver
X-Git-Tag: v2.6.21-rc1~76^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0fe4c6fcacb28bda75b31f63d3629f640a6b9bf9;p=pandora-kernel.git

ieee1394: raw1394: prevent unloading of low-level driver

Unloading the low-level driver module of a FireWire host can lead to
all sorts of trouble if a raw1394 userspace client is using the host.
Just disallow it by incrementing the LLD's module reference count on
a RAW1394_REQ_SET_CARD write operation.  Decrement it when the file
is closed.

This feature wouldn't be relevant if "modprobe -r video1394" or
"modprobe -r dv1394" didn't automatically unload ohci1394 too.
http://bugzilla.kernel.org/show_bug.cgi?id=7701

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Dan Dennedy <dan@dennedy.org>
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