net: Do delayed neigh confirmation.

When a dst_confirm() happens, mark the confirmation as pending in the
dst.  Then on the next packet out, when we have the neigh in-hand, do
the update.

This removes the dependency in dst_confirm() of dst's having an
attached neigh.

While we're here, remove the explicit 'dst' NULL check, all except 2
or 3 call sites ensure it's not NULL.  So just fix those cases up.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/core/dst.c b/net/core/dst.c
index 43d94cedbf7c..a6e19a23a745 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -152,7 +152,7 @@ EXPORT_SYMBOL(dst_discard);
 const u32 dst_default_metrics[RTAX_MAX];
 
 void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
-                int initial_ref, int initial_obsolete, int flags)
+                int initial_ref, int initial_obsolete, unsigned short flags)
 {
         struct dst_entry *dst;
 
@@ -188,6 +188,7 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
         dst->__use = 0;
         dst->lastuse = jiffies;
         dst->flags = flags;
+        dst->pending_confirm = 0;
         dst->next = NULL;
         if (!(flags & DST_NOCOUNT))
                 dst_entries_add(ops, 1);