From cdd09f49cb271d95cbe69ef886459e0490040e98 Mon Sep 17 00:00:00 2001
From: Joseph Qi <joseph.qi@huawei.com>
Date: Fri, 4 Sep 2015 15:43:57 -0700
Subject: [PATCH] ocfs2: fix BUG when o2hb_register_callback fails

In dlm_register_domain_handlers, if o2hb_register_callback fails, it
will call dlm_unregister_domain_handlers to unregister.  This will
trigger the BUG_ON in o2hb_unregister_callback because hc_magic is 0.
So we should call o2hb_setup_callback to initialize hc first.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
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