decnet: RCU conversion and get rid of dev_base_lock

While tracking dev_base_lock users, I found decnet used it in
dnet_select_source(), but for a wrong purpose:

Writers only hold RTNL, not dev_base_lock, so readers must use RCU if
they cannot use RTNL.

Adds an rcu_head in struct dn_ifaddr and handle proper RCU management.

Adds __rcu annotation in dn_route as well.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/net/dst.h b/include/net/dst.h
index ffe9cb719c0e..a5bd72646d65 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -94,10 +94,10 @@ struct dst_entry {
         int                     __use;
         unsigned long           lastuse;
         union {
-                struct dst_entry *next;
-                struct rtable __rcu *rt_next;
-                struct rt6_info   *rt6_next;
-                struct dn_route  *dn_next;
+                struct dst_entry        *next;
+                struct rtable __rcu     *rt_next;
+                struct rt6_info         *rt6_next;
+                struct dn_route __rcu   *dn_next;
         };
 };