net: Loopback ifindex is constant now

As pointed out, there are places, that access net->loopback_dev->ifindex
and after ifindex generation is made per-net this value becomes constant
equals 1. So go ahead and introduce the LOOPBACK_IFINDEX constant and use
it where appropriate.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 85a3604c87c8..c855e8d0738f 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -961,7 +961,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o
                 .saddr = oldflp->saddr,
                 .flowidn_scope = RT_SCOPE_UNIVERSE,
                 .flowidn_mark = oldflp->flowidn_mark,
-                .flowidn_iif = init_net.loopback_dev->ifindex,
+                .flowidn_iif = LOOPBACK_IFINDEX,
                 .flowidn_oif = oldflp->flowidn_oif,
         };
         struct dn_route *rt = NULL;
@@ -979,7 +979,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o
                        "dn_route_output_slow: dst=%04x src=%04x mark=%d"
                        " iif=%d oif=%d\n", le16_to_cpu(oldflp->daddr),
                        le16_to_cpu(oldflp->saddr),
-                       oldflp->flowidn_mark, init_net.loopback_dev->ifindex,
+                       oldflp->flowidn_mark, LOOPBACK_IFINDEX,
                        oldflp->flowidn_oif);
 
         /* If we have an output interface, verify its a DECnet device */
@@ -1042,7 +1042,7 @@ source_ok:
                         if (!fld.daddr)
                                 goto out;
                 }
-                fld.flowidn_oif = init_net.loopback_dev->ifindex;
+                fld.flowidn_oif = LOOPBACK_IFINDEX;
                 res.type = RTN_LOCAL;
                 goto make_route;
         }