[NET]: Fix neighbour destructor handling.

->neigh_destructor() is killed (not used), replaced with
->neigh_cleanup(), which is called when neighbor entry goes to dead
state. At this point everything is still valid: neigh->dev,
neigh->parms etc.

The device should guarantee that dead neighbor entries (neigh->dead !=
0) do not get private part initialized, otherwise nobody will cleanup
it.

I think this is enough for ipoib which is the only user of this thing.
Initialization private part of neighbor entries happens in ipib
start_xmit routine, which is not reached when device is down.  But it
would be better to add explicit test for neigh->dead in any case.

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

1 files changed, 10 insertions, 4 deletions

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 3183142c604..cfc60019cf9 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -140,6 +140,8 @@ static int neigh_forced_gc(struct neigh_table *tbl)
 				n->dead = 1;
 				shrunk	= 1;
 				write_unlock(&n->lock);
+				if (n->parms->neigh_cleanup)
+					n->parms->neigh_cleanup(n);
 				neigh_release(n);
 				continue;
 			}
@@ -211,6 +213,8 @@ static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev)
 				NEIGH_PRINTK2("neigh %p is stray.\n", n);
 			}
 			write_unlock(&n->lock);
+			if (n->parms->neigh_cleanup)
+				n->parms->neigh_cleanup(n);
 			neigh_release(n);
 		}
 	}
@@ -582,9 +586,6 @@ void neigh_destroy(struct neighbour *neigh)
 			kfree(hh);
 	}
 
-	if (neigh->parms->neigh_destructor)
-		(neigh->parms->neigh_destructor)(neigh);
-
 	skb_queue_purge(&neigh->arp_queue);
 
 	dev_put(neigh->dev);
@@ -675,6 +676,8 @@ static void neigh_periodic_timer(unsigned long arg)
 			*np = n->next;
 			n->dead = 1;
 			write_unlock(&n->lock);
+			if (n->parms->neigh_cleanup)
+				n->parms->neigh_cleanup(n);
 			neigh_release(n);
 			continue;
 		}
@@ -2088,8 +2091,11 @@ void __neigh_for_each_release(struct neigh_table *tbl,
 			} else
 				np = &n->next;
 			write_unlock(&n->lock);
-			if (release)
+			if (release) {
+				if (n->parms->neigh_cleanup)
+					n->parms->neigh_cleanup(n);
 				neigh_release(n);
+			}
 		}
 	}
 }