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authorEric Dumazet <dada1@cosmosbay.com>2008-01-10 03:55:57 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-10 03:55:57 -0800
commit0bcceadceb0907094ba4e40bf9a7cd9b080f13fb (patch)
tree6cec2343354c5a22107eb53da276ab744519033a
parent9cd40029423701c376391da59d2c6469672b4bed (diff)
[IPV4] ROUTE: fix rcu_dereference() uses in /proc/net/rt_cache
In rt_cache_get_next(), no need to guard seq->private by a rcu_dereference() since seq is private to the thread running this function. Reading seq.private once (as guaranted bu rcu_dereference()) or several time if compiler really is dumb enough wont change the result. But we miss real spots where rcu_dereference() are needed, both in rt_cache_get_first() and rt_cache_get_next() Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/route.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index d3377069ce05..28484f396b04 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -283,12 +283,12 @@ static struct rtable *rt_cache_get_first(struct seq_file *seq)
break;
rcu_read_unlock_bh();
}
- return r;
+ return rcu_dereference(r);
}
static struct rtable *rt_cache_get_next(struct seq_file *seq, struct rtable *r)
{
- struct rt_cache_iter_state *st = rcu_dereference(seq->private);
+ struct rt_cache_iter_state *st = seq->private;
r = r->u.dst.rt_next;
while (!r) {
@@ -298,7 +298,7 @@ static struct rtable *rt_cache_get_next(struct seq_file *seq, struct rtable *r)
rcu_read_lock_bh();
r = rt_hash_table[st->bucket].chain;
}
- return r;
+ return rcu_dereference(r);
}
static struct rtable *rt_cache_get_idx(struct seq_file *seq, loff_t pos)