* [Patch net-next] ipv6: fix a RCU warning in net/ipv6/ip6_flowlabel.c
@ 2013-02-08 1:52 Cong Wang
2013-02-08 22:57 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Cong Wang @ 2013-02-08 1:52 UTC (permalink / raw)
To: netdev; +Cc: David S. Miller, YOSHIFUJI Hideaki, Cong Wang
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>
---
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_fl_lock);
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); \
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Patch net-next] ipv6: fix a RCU warning in net/ipv6/ip6_flowlabel.c
2013-02-08 1:52 [Patch net-next] ipv6: fix a RCU warning in net/ipv6/ip6_flowlabel.c Cong Wang
@ 2013-02-08 22:57 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2013-02-08 22:57 UTC (permalink / raw)
To: amwang; +Cc: netdev, yoshfuji
From: Cong Wang <amwang@redhat.com>
Date: Fri, 8 Feb 2013 09:52:40 +0800
> 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>
Applied.
^ permalink raw reply [flat|nested] 2+ messages in thread
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