net: sched: cls_cgroup use RCU
authorJohn Fastabend <john.fastabend@gmail.com>
Sat, 13 Sep 2014 03:06:26 +0000 (20:06 -0700)
committerDavid S. Miller <davem@davemloft.net>
Sat, 13 Sep 2014 16:30:26 +0000 (12:30 -0400)
commit952313bd62589cae216a579bb7ebc76f8e290817
tree56562cd7fa266516c22199c10e3acf4ab1e91669
parent9888faefe1327909f3acf34d1feda87a368bb858
net: sched: cls_cgroup use RCU

Make cgroup classifier safe for RCU.

Also drops the calls in the classify routine that were doing a
rcu_read_lock()/rcu_read_unlock(). If the rcu_read_lock() isn't held
entering this routine we have issues with deleting the classifier
chain so remove the unnecessary rcu_read_lock()/rcu_read_unlock()
pair noting all paths AFAIK hold rcu_read_lock.

If there is a case where classify is called without the rcu read lock
then an rcu splat will occur and we can correct it.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/sched/cls_cgroup.c