net: Embed hh_cache inside of struct neighbour.

Now that there is a one-to-one correspondance between neighbour
and hh_cache entries, we no longer need:

1) dynamic allocation
2) attachment to dst->hh
3) refcounting

Initialization of the hh_cache entry is indicated by hh_len
being non-zero, and such initialization is always done with
the neighbour's lock held as a writer.

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

1 files changed, 0 insertions, 7 deletions

diff --git a/net/core/dst.c b/net/core/dst.c
index 6135f36..4aacc14 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -172,7 +172,6 @@ void *dst_alloc(struct dst_ops *ops, struct net_device *dev,
 	dst->expires = 0UL;
 	dst->path = dst;
 	dst->neighbour = NULL;
-	dst->hh = NULL;
 #ifdef CONFIG_XFRM
 	dst->xfrm = NULL;
 #endif
@@ -226,19 +225,13 @@ struct dst_entry *dst_destroy(struct dst_entry * dst)
 {
 	struct dst_entry *child;
 	struct neighbour *neigh;
-	struct hh_cache *hh;
 
 	smp_rmb();
 
 again:
 	neigh = dst->neighbour;
-	hh = dst->hh;
 	child = dst->child;
 
-	dst->hh = NULL;
-	if (hh)
-		hh_cache_put(hh);
-
 	if (neigh) {
 		dst->neighbour = NULL;
 		neigh_release(neigh);