From ea819867b788728aca60717e4fdacb3df771f670 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@oracle.com>
Date: Thu, 15 Jul 2010 12:34:33 -0700
Subject: [PATCH] RDS/IB: protect the list of IB devices

The RDS IB device list wasn't protected by any locking.  Traversal in
both the get_mr and FMR flushing paths could race with additon and
removal.

List manipulation is done with RCU primatives and is protected by the
write side of a rwsem.  The list traversal in the get_mr fast path is
protected by a rcu read critical section.  The FMR list traversal is
more problematic because it can block while traversing the list.  We
protect this with the read side of the rwsem.

Signed-off-by: Zach Brown <zach.brown@oracle.com>
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