From b3c54de6f82d01637796bcc1f667a45f3b32e814 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Mon, 13 Aug 2012 17:15:50 -0400
Subject: [PATCH] NFS: Convert nfs_get_lock_context to return an ERR_PTR on
 failure

We want to be able to distinguish between allocation failures, and
the case where the lock context is not needed (because there are no
locks).

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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