From 6022e75bf0686799a6ecca3c33a669e6c70e9d26 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.com>
Date: Thu, 13 Aug 2015 12:32:55 +1000
Subject: [PATCH] md: extend spinlock protection in
 register_md_cluster_operations

This code looks racy.

The only possible race is if two modules try to register at the same
time and that won't happen.  But make the code look safe anyway.

Signed-off-by: NeilBrown <neilb@suse.com>
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