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authorRobert Olsson <robert.olsson@its.uu.se>2009-05-21 18:20:59 -0400
committerDavid S. Miller <davem@davemloft.net>2009-05-21 18:20:59 -0400
commit3ed18d76d959e5cbfa5d70c8f7ba95476582a556 (patch)
tree9fbd15b820b43627440fd6961f687c30e8d4e130 /net
parent5b5f792a6a9a2f9ae812d151ed621f72e99b1725 (diff)
ipv4: Fix oops with FIB_TRIE
It seems we can fix this by disabling preemption while we re-balance the trie. This is with the CONFIG_CLASSIC_RCU. It's been stress-tested at high loads continuesly taking a full BGP table up/down via iproute -batch. Note. fib_trie is not updated for CONFIG_PREEMPT_RCU Reported-by: Andrei Popa Signed-off-by: Robert Olsson <robert.olsson@its.uu.se> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/fib_trie.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index ec0ae490f0b6..33c7c85dfe40 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -986,9 +986,12 @@ fib_find_node(struct trie *t, u32 key)
986static struct node *trie_rebalance(struct trie *t, struct tnode *tn) 986static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
987{ 987{
988 int wasfull; 988 int wasfull;
989 t_key cindex, key = tn->key; 989 t_key cindex, key;
990 struct tnode *tp; 990 struct tnode *tp;
991 991
992 preempt_disable();
993 key = tn->key;
994
992 while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) { 995 while (tn != NULL && (tp = node_parent((struct node *)tn)) != NULL) {
993 cindex = tkey_extract_bits(key, tp->pos, tp->bits); 996 cindex = tkey_extract_bits(key, tp->pos, tp->bits);
994 wasfull = tnode_full(tp, tnode_get_child(tp, cindex)); 997 wasfull = tnode_full(tp, tnode_get_child(tp, cindex));
@@ -1007,6 +1010,7 @@ static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
1007 if (IS_TNODE(tn)) 1010 if (IS_TNODE(tn))
1008 tn = (struct tnode *)resize(t, (struct tnode *)tn); 1011 tn = (struct tnode *)resize(t, (struct tnode *)tn);
1009 1012
1013 preempt_enable();
1010 return (struct node *)tn; 1014 return (struct node *)tn;
1011} 1015}
1012 1016