From: Mikulas Patocka <mpatocka@redhat.com>
Subject: dm table: drop reference at unbind
References: bnc#457205
Patch-mainline: 2.6.28-rc4
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>

[PATCH 2/3] for bnc 457205

mainline commit a1b51e98676932d031f5eec1325b2df4bbdc8f26

    
    Move one dm_table_put() so that the last reference in the thread
    gets dropped in __unbind().
    
    This is required for a following patch,
    dm-table-rework-reference-counting.patch, which will change the logic in
    such a way that table destructor is called only at specific points in
    the code.
    
    Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: Alasdair G Kergon <agk@redhat.com>

Index: linux-2.6.27/drivers/md/dm.c
===================================================================
--- linux-2.6.27.orig/drivers/md/dm.c
+++ linux-2.6.27/drivers/md/dm.c
@@ -2055,8 +2055,8 @@ void dm_put(struct mapped_device *md)
 			dm_table_presuspend_targets(map);
 			dm_table_postsuspend_targets(map);
 		}
-		__unbind(md);
 		dm_table_put(map);
+		__unbind(md);
 		free_dev(md);
 	}
 }