svcrdma: Update svc_rdma_send_error to use DMA LKEY

Update the svc_rdma_send_error code to use the DMA LKEY which is valid
regardless of the memory registration strategy in use.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 98f945c5a007..c0cd334fe1c6 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -1314,10 +1314,14 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
         length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
 
         /* Prepare SGE for local address */
-        atomic_inc(&xprt->sc_dma_used);
         sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
                                    p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
-        sge.lkey = xprt->sc_phys_mr->lkey;
+        if (ib_dma_mapping_error(xprt->sc_cm_id->device, sge.addr)) {
+                put_page(p);
+                return;
+        }
+        atomic_inc(&xprt->sc_dma_used);
+        sge.lkey = xprt->sc_dma_lkey;
         sge.length = length;
 
         ctxt = svc_rdma_get_context(xprt);
@@ -1338,6 +1342,9 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
         if (ret) {
                 dprintk("svcrdma: Error %d posting send for protocol error\n",
                         ret);
+                ib_dma_unmap_page(xprt->sc_cm_id->device,
+                                  sge.addr, PAGE_SIZE,
+                                  DMA_FROM_DEVICE);
                 svc_rdma_put_context(ctxt, 1);
         }
 }