From 331b72922c5f58d48fd5500acadc91777cc31970 Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Fri, 12 Sep 2014 20:08:20 -0700 Subject: net: sched: RCU cls_tcindex Make cls_tcindex RCU safe. This patch addds a new RCU routine rcu_dereference_bh_rtnl() to check caller either holds the rcu read lock or RTNL. This is needed to handle the case where tcindex_lookup() is being called in both cases. Signed-off-by: John Fastabend Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- include/linux/rtnetlink.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/linux/rtnetlink.h') diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h index 167bae7bdfa4..6cacbce1a06c 100644 --- a/include/linux/rtnetlink.h +++ b/include/linux/rtnetlink.h @@ -46,6 +46,16 @@ static inline int lockdep_rtnl_is_held(void) #define rcu_dereference_rtnl(p) \ rcu_dereference_check(p, lockdep_rtnl_is_held()) +/** + * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking + * @p: The pointer to read, prior to dereference + * + * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh() + * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh() + */ +#define rcu_dereference_bh_rtnl(p) \ + rcu_dereference_bh_check(p, lockdep_rtnl_is_held()) + /** * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL * @p: The pointer to read, prior to dereferencing -- cgit v1.2.3-59-g8ed1b