ipv6: fix a RCU warning in net/ipv6/ip6_flowlabel.c
This patch fixes the following RCU warning:
[ 51.680236] ===============================
[ 51.681914] [ INFO: suspicious RCU usage. ]
[ 51.683610] 3.8.0-rc6-next-20130206-sasha-00028-g83214f7-dirty #276 Tainted: G W
[ 51.686703] -------------------------------
[ 51.688281] net/ipv6/ip6_flowlabel.c:671 suspicious rcu_dereference_check() usage!
we should use rcu_dereference_bh() when we hold rcu_read_lock_bh().
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index ea42bf4..a7da2f4 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -65,13 +65,13 @@
static DEFINE_SPINLOCK(ip6_sk_fl_lock);
#define for_each_fl_rcu(hash, fl) \
- for (fl = rcu_dereference(fl_ht[(hash)]); \
+ for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
fl != NULL; \
- fl = rcu_dereference(fl->next))
+ fl = rcu_dereference_bh(fl->next))
#define for_each_fl_continue_rcu(fl) \
- for (fl = rcu_dereference(fl->next); \
+ for (fl = rcu_dereference_bh(fl->next); \
fl != NULL; \
- fl = rcu_dereference(fl->next))
+ fl = rcu_dereference_bh(fl->next))
#define for_each_sk_fl_rcu(np, sfl) \
for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \