tree 6f4bfd27cdcdad15b53df997476fae539383bf4a
parent 7ec75f254742766eb729f1d1024a5b4e6692fc5f
author Jeff Mahoney <jeffm@suse.com> 1151306845 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1151341115 -0700

[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>