svcrdma: Clean up process_context()

Be sure the completed ctxt is put in every path.

The xprt enqueue can take a while, so put the completed ctxt back
in circulation _before_ enqueuing the xprt.

Remove/disable debugging.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Acked-by: Bruce Fields <bfields@fieldses.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

net/sunrpc/xprtrdma/svc_rdma_transport.c

@@ -386,46 +386,44 @@ static void rq_cq_reap(struct svcxprt_rdma *xprt)
 static void process_context(struct svcxprt_rdma *xprt,
 			    struct svc_rdma_op_ctxt *ctxt)
 {
+	struct svc_rdma_op_ctxt *read_hdr;
+	int free_pages = 0;
+
 	svc_rdma_unmap_dma(ctxt);
 
 	switch (ctxt->wr_op) {
 	case IB_WR_SEND:
-		if (ctxt->frmr)
-			pr_err("svcrdma: SEND: ctxt->frmr != NULL\n");
-		svc_rdma_put_context(ctxt, 1);
+		free_pages = 1;
 		break;
 
 	case IB_WR_RDMA_WRITE:
-		if (ctxt->frmr)
-			pr_err("svcrdma: WRITE: ctxt->frmr != NULL\n");
-		svc_rdma_put_context(ctxt, 0);
 		break;
 
 	case IB_WR_RDMA_READ:
 	case IB_WR_RDMA_READ_WITH_INV:
 		svc_rdma_put_frmr(xprt, ctxt->frmr);
-		if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
-			struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr;
-			if (read_hdr) {
+
+		if (!test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags))
+			break;
+
+		read_hdr = ctxt->read_hdr;
+		svc_rdma_put_context(ctxt, 0);
+
 		spin_lock_bh(&xprt->sc_rq_dto_lock);
 		set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
 		list_add_tail(&read_hdr->dto_q,
 			      &xprt->sc_read_complete_q);
 		spin_unlock_bh(&xprt->sc_rq_dto_lock);
-			} else {
-				pr_err("svcrdma: ctxt->read_hdr == NULL\n");
-			}
 		svc_xprt_enqueue(&xprt->sc_xprt);
-		}
-		svc_rdma_put_context(ctxt, 0);
-		break;
+		return;
 
 	default:
-		printk(KERN_ERR "svcrdma: unexpected completion type, "
-		       "opcode=%d\n",
+		dprintk("svcrdma: unexpected completion opcode=%d\n",
 			ctxt->wr_op);
 		break;
 	}
+
+	svc_rdma_put_context(ctxt, free_pages);
 }
 
 /*