diff options
| -rw-r--r-- | include/net/ip6_fib.h | 3 | ||||
| -rw-r--r-- | net/ipv6/ip6_fib.c | 12 | ||||
| -rw-r--r-- | net/ipv6/route.c | 7 |
3 files changed, 18 insertions, 4 deletions
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h index 40105738e2f6..525f701653ca 100644 --- a/include/net/ip6_fib.h +++ b/include/net/ip6_fib.h @@ -167,7 +167,8 @@ struct fib6_info { dst_nocount:1, dst_nopolicy:1, dst_host:1, - unused:3; + fib6_destroying:1, + unused:2; struct fib6_nh fib6_nh; struct rcu_head rcu; diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 08e0390e001c..008421b550c6 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -904,6 +904,12 @@ static void fib6_drop_pcpu_from(struct fib6_info *f6i, { int cpu; + /* Make sure rt6_make_pcpu_route() wont add other percpu routes + * while we are cleaning them here. + */ + f6i->fib6_destroying = 1; + mb(); /* paired with the cmpxchg() in rt6_make_pcpu_route() */ + /* release the reference to this fib entry from * all of its cached pcpu routes */ @@ -927,6 +933,9 @@ static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn, { struct fib6_table *table = rt->fib6_table; + if (rt->rt6i_pcpu) + fib6_drop_pcpu_from(rt, table); + if (refcount_read(&rt->fib6_ref) != 1) { /* This route is used as dummy address holder in some split * nodes. It is not leaked, but it still holds other resources, @@ -948,9 +957,6 @@ static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn, fn = rcu_dereference_protected(fn->parent, lockdep_is_held(&table->tb6_lock)); } - - if (rt->rt6i_pcpu) - fib6_drop_pcpu_from(rt, table); } } diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 23a20d62daac..27c0cc5d9d30 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1295,6 +1295,13 @@ static struct rt6_info *rt6_make_pcpu_route(struct net *net, prev = cmpxchg(p, NULL, pcpu_rt); BUG_ON(prev); + if (res->f6i->fib6_destroying) { + struct fib6_info *from; + + from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); + fib6_info_release(from); + } + return pcpu_rt; } |