md: Just use RCU when checking for overlap between arrays.
authorNeilBrown <neilb@suse.de>
Mon, 29 Sep 2014 05:33:20 +0000 (15:33 +1000)
committerNeilBrown <neilb@suse.de>
Tue, 14 Oct 2014 02:08:28 +0000 (13:08 +1100)
We don't really need the full mddev_lock here, and having to
drop it is messy.
RCU is enough to protect these lists.

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

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