linux/netback: unmap tx ring gref when mapping of rx ring gref failed

Signed-off-by: Jan Beulich <jbeulich@novell.com>

diff --git a/drivers/xen/netback/interface.c b/drivers/xen/netback/interface.c
index 610891fc29437393ccbbd5fe68ef4a5b0c4389e8..404001a881cd4ce48a3b22c5e6e1a668351bc156 100644 (file)
--- a/drivers/xen/netback/interface.c
+++ b/drivers/xen/netback/interface.c
@@ -219,6 +219,13 @@ static int map_frontend_pages(
                BUG();
 
        if (op.status) {
+               struct gnttab_unmap_grant_ref unop;
+
+               gnttab_set_unmap_op(&unop,
+                                   (unsigned long)netif->tx_comms_area->addr,
+                                   GNTMAP_host_map, netif->tx_shmem_handle);
+               VOID(HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
+                                              &unop, 1));
                DPRINTK(" Gnttab failure mapping rx_ring_ref!\n");
                return op.status;
        }