ipv4: fib: Convert FIB notification chain to be atomic

In order not to hold RTNL for long periods of time we're going to dump
the FIB tables using RCU.

Convert the FIB notification chain to be atomic, as we can't block in
RCU critical sections.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 026f309c51e9b6143e74efe2d31c8c5e7a7a3c26..9bfce0df20dce5cc0a7969b3db63d2fe53890f23 100644 (file)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -84,17 +84,17 @@
 #include <trace/events/fib.h>
 #include "fib_lookup.h"
 
-static BLOCKING_NOTIFIER_HEAD(fib_chain);
+static ATOMIC_NOTIFIER_HEAD(fib_chain);
 
 int register_fib_notifier(struct notifier_block *nb)
 {
-       return blocking_notifier_chain_register(&fib_chain, nb);
+       return atomic_notifier_chain_register(&fib_chain, nb);
 }
 EXPORT_SYMBOL(register_fib_notifier);
 
 int unregister_fib_notifier(struct notifier_block *nb)
 {
-       return blocking_notifier_chain_unregister(&fib_chain, nb);
+       return atomic_notifier_chain_unregister(&fib_chain, nb);
 }
 EXPORT_SYMBOL(unregister_fib_notifier);
 
@@ -102,7 +102,7 @@ int call_fib_notifiers(struct net *net, enum fib_event_type event_type,
                       struct fib_notifier_info *info)
 {
        info->net = net;
-       return blocking_notifier_call_chain(&fib_chain, event_type, info);
+       return atomic_notifier_call_chain(&fib_chain, event_type, info);
 }
 
 static int call_fib_entry_notifiers(struct net *net,