From: Eric Dumazet Date: Fri, 11 Jan 2008 06:35:21 +0000 (-0800) Subject: [DECNET] ROUTE: fix rcu_dereference() uses in /proc/net/decnet_cache X-Git-Tag: v2.6.24-rc8~7^2~6 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=0d89d7944fead211422e21fb7ea70ed3b903a79e;p=linux-2.6-omap-h63xx.git [DECNET] ROUTE: fix rcu_dereference() uses in /proc/net/decnet_cache In dn_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 dn_rt_cache_get_first() and dn_rt_cache_get_next() Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index 66663e5d7ac..0e10ff21e29 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -1665,12 +1665,12 @@ static struct dn_route *dn_rt_cache_get_first(struct seq_file *seq) break; rcu_read_unlock_bh(); } - return rt; + return rcu_dereference(rt); } static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt) { - struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private); + struct dn_rt_cache_iter_state *s = seq->private; rt = rt->u.dst.dn_next; while(!rt) { @@ -1680,7 +1680,7 @@ static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_rou rcu_read_lock_bh(); rt = dn_rt_hash_table[s->bucket].chain; } - return rt; + return rcu_dereference(rt); } static void *dn_rt_cache_seq_start(struct seq_file *seq, loff_t *pos)