svcrdma: Remove unneeded spin locks from __svc_rdma_free

At the time __svc_rdma_free is called, we are guaranteed that all references
to this transport are gone. There is, therefore, no need to protect the
resource lists with a spin lock.
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -1027,7 +1027,6 @@ static void __svc_rdma_free(struct work_struct *work)
 	 * cm_id because the device ptr is needed to unmap the dma in
 	 * svc_rdma_put_context.
 	 */
-	spin_lock_bh(&rdma->sc_read_complete_lock);
 	while (!list_empty(&rdma->sc_read_complete_q)) {
 		struct svc_rdma_op_ctxt *ctxt;
 		ctxt = list_entry(rdma->sc_read_complete_q.next,
@@ -1036,10 +1035,8 @@ static void __svc_rdma_free(struct work_struct *work)
 		list_del_init(&ctxt->dto_q);
 		svc_rdma_put_context(ctxt, 1);
 	}
-	spin_unlock_bh(&rdma->sc_read_complete_lock);
 
 	/* Destroy queued, but not processed recv completions */
-	spin_lock_bh(&rdma->sc_rq_dto_lock);
 	while (!list_empty(&rdma->sc_rq_dto_q)) {
 		struct svc_rdma_op_ctxt *ctxt;
 		ctxt = list_entry(rdma->sc_rq_dto_q.next,
@@ -1048,7 +1045,6 @@ static void __svc_rdma_free(struct work_struct *work)
 		list_del_init(&ctxt->dto_q);
 		svc_rdma_put_context(ctxt, 1);
 	}
-	spin_unlock_bh(&rdma->sc_rq_dto_lock);
 
 	/* Warn if we leaked a resource or under-referenced */
 	WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0);