NFS: Fix buglet in fs/nfs/write.c

I've been reading through fs/nfs/write.c trying to track down a bug
that seems to be related to pages loosing a refcount and getting
freed too early (you interested in detail??) and I spotted a little
bug which the following patch should fix.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 9449b6835509..d6ad449041eb 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -653,8 +653,11 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
                                 spin_unlock(&nfsi->req_lock);
                                 error = nfs_wait_on_request(req);
                                 nfs_release_request(req);
-                                if (error < 0)
+                                if (error < 0) {
+                                        if (new)
+                                                nfs_release_request(new);
                                         return ERR_PTR(error);
+                                }
                                 continue;
                         }
                         spin_unlock(&nfsi->req_lock);