svcrdma: Add dma map count and WARN_ON

Add a dma map count in order to verify that all DMA mapping resources
have been freed when the transport is closed.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index d25971b42a74..b4b17f44cb29 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -222,6 +222,7 @@ static void rdma_set_ctxt_sge(struct svcxprt_rdma *xprt,
         ctxt->count = count;
         ctxt->direction = DMA_FROM_DEVICE;
         for (i = 0; i < count; i++) {
+                atomic_inc(&xprt->sc_dma_used);
                 ctxt->sge[i].addr =
                         ib_dma_map_single(xprt->sc_cm_id->device,
                                           vec[i].iov_base, vec[i].iov_len,