[Xen-devel] [PATCH] linux/netback: unmap tx ring gref when mapping of rx ring gref failed

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

As usual, written and tested on 2.6.27.12 and made apply to the 2.6.18
tree without further testing.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- head-2009-01-21.orig/drivers/xen/netback/interface.c        2008-12-01 
12:10:26.000000000 +0100
+++ head-2009-01-21/drivers/xen/netback/interface.c     2009-01-26 
14:49:11.000000000 +0100
@@ -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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