ipv6: fix sparse warning on rt6i_node
commit 4e587ea71bf924f7dac621f1351653bd41e446cb upstream. Commit c5cff8561d2d adds rcu grace period before freeing fib6_node. This generates a new sparse warning on rt->rt6i_node related code: net/ipv6/route.c:1394:30: error: incompatible types in comparison expression (different address spaces) ./include/net/ip6_fib.h:187:14: error: incompatible types in comparison expression (different address spaces) This commit adds "__rcu" tag for rt6i_node and makes sure corresponding rcu API is used for it. After this fix, sparse no longer generates the above warning. Fixes: c5cff8561d2d ("ipv6: add rcu grace period before freeing fib6_node") Signed-off-by: Wei Wang <weiwan@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net> [bwh: Backported to 3.16: drop changes in rt6_cache_allowed_for_pmtu()] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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@ -96,7 +96,7 @@ struct rt6_info {
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* the same cache line.
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*/
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struct fib6_table *rt6i_table;
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struct fib6_node *rt6i_node;
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struct fib6_node __rcu *rt6i_node;
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struct in6_addr rt6i_gateway;
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@ -4793,7 +4793,7 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
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* our DAD process, so we don't need
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* to do it again
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*/
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if (!(ifp->rt->rt6i_node))
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if (!rcu_access_pointer(ifp->rt->rt6i_node))
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ip6_ins_rt(ifp->rt);
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if (ifp->idev->cnf.forwarding)
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addrconf_join_anycast(ifp);
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@ -794,7 +794,7 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
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add:
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rt->dst.rt6_next = iter;
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*ins = rt;
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rt->rt6i_node = fn;
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rcu_assign_pointer(rt->rt6i_node, fn);
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atomic_inc(&rt->rt6i_ref);
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inet6_rt_notify(RTM_NEWROUTE, rt, info);
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info->nl_net->ipv6.rt6_stats->fib_rt_entries++;
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@ -812,7 +812,7 @@ add:
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return -ENOENT;
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}
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*ins = rt;
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rt->rt6i_node = fn;
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rcu_assign_pointer(rt->rt6i_node, fn);
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rt->dst.rt6_next = iter->dst.rt6_next;
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atomic_inc(&rt->rt6i_ref);
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inet6_rt_notify(RTM_NEWROUTE, rt, info);
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@ -1334,8 +1334,9 @@ static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp,
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int fib6_del(struct rt6_info *rt, struct nl_info *info)
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{
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struct fib6_node *fn = rcu_dereference_protected(rt->rt6i_node,
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lockdep_is_held(&rt->rt6i_table->tb6_lock));
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struct net *net = info->nl_net;
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struct fib6_node *fn = rt->rt6i_node;
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struct rt6_info **rtp;
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#if RT6_DEBUG >= 2
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@ -1514,7 +1515,9 @@ static int fib6_clean_node(struct fib6_walker_t *w)
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if (res) {
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#if RT6_DEBUG >= 2
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pr_debug("%s: del failed: rt=%p@%p err=%d\n",
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__func__, rt, rt->rt6i_node, res);
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__func__, rt,
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rcu_access_pointer(rt->rt6i_node),
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res);
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#endif
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continue;
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}
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