commit 57b70321247d5decb480a8344c29ab5813901790
author Milan Broz <mbroz@redhat.com> Mon Jun 22 10:12:11 2009 +0100
committer Greg Kroah-Hartman <gregkh@suse.de> Thu Jul 02 16:40:59 2009 -0700
tree 67b62909056407b9b0f12ed894520509f82ef0b3
parent 85e05eaba5840385843fe61d8db191be84fe3ac6

dm: sysfs skip output when device is being destroyed

commit 4d89b7b4e4726893453d0fb4ddbb5b3e16353994 upstream.

Do not process sysfs attributes when device is being destroyed.

Otherwise code can cause
  BUG_ON(test_bit(DMF_FREEING, &md->flags));
in dm_put() call.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/md/dm.c

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8d40f27..377bb6e 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1728,6 +1728,10 @@
 	if (&md->kobj != kobj)
 		return NULL;
 
+	if (test_bit(DMF_FREEING, &md->flags) ||
+	    test_bit(DMF_DELETING, &md->flags))
+		return NULL;
+
 	dm_get(md);
 	return md;
 }