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authorEric Dumazet <eric.dumazet@gmail.com>2010-11-10 10:50:44 +0000
committerDavid S. Miller <davem@davemloft.net>2010-11-12 13:27:25 -0800
commit190683a9d5457e6d962c232ffbecac3ab158dddd (patch)
tree85dfd126daa763f858787b3a9aa769efb7f0718a /net/socket.c
parente85eb11782259dc39502807f3ec903a7b82b1bab (diff)
downloadlinux-190683a9d5457e6d962c232ffbecac3ab158dddd.tar.bz2
net: net_families __rcu annotations
Use modern RCU API / annotations for net_families array. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/net/socket.c b/net/socket.c
index 3ca2fd9e3720..c898df76e924 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -156,7 +156,7 @@ static const struct file_operations socket_file_ops = {
*/
static DEFINE_SPINLOCK(net_family_lock);
-static const struct net_proto_family *net_families[NPROTO] __read_mostly;
+static const struct net_proto_family __rcu *net_families[NPROTO] __read_mostly;
/*
* Statistics counters of the socket lists
@@ -1200,7 +1200,7 @@ int __sock_create(struct net *net, int family, int type, int protocol,
* requested real, full-featured networking support upon configuration.
* Otherwise module support will break!
*/
- if (net_families[family] == NULL)
+ if (rcu_access_pointer(net_families[family]) == NULL)
request_module("net-pf-%d", family);
#endif
@@ -2332,10 +2332,11 @@ int sock_register(const struct net_proto_family *ops)
}
spin_lock(&net_family_lock);
- if (net_families[ops->family])
+ if (rcu_dereference_protected(net_families[ops->family],
+ lockdep_is_held(&net_family_lock)))
err = -EEXIST;
else {
- net_families[ops->family] = ops;
+ rcu_assign_pointer(net_families[ops->family], ops);
err = 0;
}
spin_unlock(&net_family_lock);
@@ -2363,7 +2364,7 @@ void sock_unregister(int family)
BUG_ON(family < 0 || family >= NPROTO);
spin_lock(&net_family_lock);
- net_families[family] = NULL;
+ rcu_assign_pointer(net_families[family], NULL);
spin_unlock(&net_family_lock);
synchronize_rcu();