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>

diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index 98f945c..c0cd334 100644 (file)
--- 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);
        }
 }