From: Jeff Mahoney <jeffm@suse.com>
Date: Mon, 26 Jun 2006 07:27:25 +0000 (-0700)
Subject: [PATCH] dm: add module ref counting
X-Git-Tag: v2.6.18-rc1~663
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10da4f795f965f22039aa2930b6f80964aad3ee5;p=pandora-kernel.git

[PATCH] dm: add module ref counting

The reference counting on dm-mod is zero if no mapped devices are open.  This
is incorrect, and can lead to an oops if the module is unloaded while mapped
devices exist.

This patch claims a reference to the module whenever a device is created, and
drops it again when the device is freed.

Devices must be removed before dm-mod is unloaded.

[akpm: too late for 2.6.17 - suitable for 2.6.17.x after it has settled]

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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