NFSv4: Kill nfs4_renewd_prepare_shutdown()

The NFSv4 renew daemon is shared between all active super blocks that refer
to a particular NFS server, so it is wrong to be shutting it down in
nfs4_kill_super every time a super block is destroyed.

This patch therefore kills nfs4_renewd_prepare_shutdown altogether, and
leaves it up to nfs4_shutdown_client() to also shut down the renew daemon
by means of the existing call to nfs4_kill_renewd().
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4renewd.c

@@ -126,12 +126,6 @@ nfs4_schedule_state_renewal(struct nfs_client *clp)
 	spin_unlock(&clp->cl_lock);
 }
 
-void
-nfs4_renewd_prepare_shutdown(struct nfs_server *server)
-{
-	cancel_delayed_work(&server->nfs_client->cl_renewd);
-}
-
 void
 nfs4_kill_renewd(struct nfs_client *clp)
 {

fs/nfs/super.c

@@ -2689,7 +2689,6 @@ static void nfs4_kill_super(struct super_block *sb)
 	dprintk("--> %s\n", __func__);
 	nfs_super_return_all_delegations(sb);
 	kill_anon_super(sb);
-	nfs4_renewd_prepare_shutdown(server);
 	nfs_fscache_release_super_cookie(sb);
 	nfs_free_server(server);
 	dprintk("<-- %s\n", __func__);