[Xen-changelog] [linux-2.6.18-xen] linux/netback: unmap tx ring gref when mapping of rx ring gref failed

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1233150129 0
# Node ID 51decc39e5e73ea201d0b96108f8a893106a6864
# Parent  c9783c08495c56337dec371582b3f948e3b5ed8d
linux/netback: unmap tx ring gref when mapping of rx ring gref failed

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 drivers/xen/netback/interface.c |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r c9783c08495c -r 51decc39e5e7 drivers/xen/netback/interface.c
--- a/drivers/xen/netback/interface.c   Wed Jan 28 13:41:33 2009 +0000
+++ b/drivers/xen/netback/interface.c   Wed Jan 28 13:42:09 2009 +0000
@@ -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;
        }

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