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Date: Wed, 13 Mar 2013 15:48:27 -0700
From: Pravin B Shelar <pshelar@...ira.com>
To: davem@...emloft.net
Cc: stephen@...workplumber.org, netdev@...r.kernel.org,
jesse@...ira.com, Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net-next 1/6] GRE: Use RTNL for atomic protocol registration.
Currently gre demultiplexer uses its own spin-lock. We should
rather RTNL lock.
Suggested-by: Stephen Hemminger <--cc stephen@...workplumber.org>
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
drivers/net/ppp/pptp.c | 4 ++++
net/ipv4/gre.c | 18 +++++-------------
net/ipv4/ip_gre.c | 6 ++++++
3 files changed, 15 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c
index 162464f..672e7e3 100644
--- a/drivers/net/ppp/pptp.c
+++ b/drivers/net/ppp/pptp.c
@@ -673,7 +673,9 @@ static int __init pptp_init_module(void)
if (!callid_sock)
return -ENOMEM;
+ rtnl_lock();
err = gre_add_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
+ rtnl_unlock();
if (err) {
pr_err("PPTP: can't add gre protocol\n");
goto out_mem_free;
@@ -707,7 +709,9 @@ static void __exit pptp_exit_module(void)
{
unregister_pppox_proto(PX_PROTO_PPTP);
proto_unregister(&pptp_sk_proto);
+ rtnl_lock();
gre_del_protocol(&gre_pptp_protocol, GREPROTO_PPTP);
+ rtnl_unlock();
vfree(callid_sock);
}
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 7a4c710..fbaf33d 100644
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -26,7 +26,6 @@
static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
-static DEFINE_SPINLOCK(gre_proto_lock);
struct gre_base_hdr {
__be16 flags;
__be16 protocol;
@@ -35,19 +34,16 @@ struct gre_base_hdr {
int gre_add_protocol(const struct gre_protocol *proto, u8 version)
{
+ ASSERT_RTNL();
if (version >= GREPROTO_MAX)
goto err_out;
- spin_lock(&gre_proto_lock);
if (gre_proto[version])
- goto err_out_unlock;
+ goto err_out;
RCU_INIT_POINTER(gre_proto[version], proto);
- spin_unlock(&gre_proto_lock);
return 0;
-err_out_unlock:
- spin_unlock(&gre_proto_lock);
err_out:
return -1;
}
@@ -55,20 +51,16 @@ EXPORT_SYMBOL_GPL(gre_add_protocol);
int gre_del_protocol(const struct gre_protocol *proto, u8 version)
{
+ ASSERT_RTNL();
if (version >= GREPROTO_MAX)
goto err_out;
- spin_lock(&gre_proto_lock);
- if (rcu_dereference_protected(gre_proto[version],
- lockdep_is_held(&gre_proto_lock)) != proto)
- goto err_out_unlock;
+ if (rtnl_dereference(gre_proto[version]) != proto)
+ goto err_out;
RCU_INIT_POINTER(gre_proto[version], NULL);
- spin_unlock(&gre_proto_lock);
synchronize_rcu();
return 0;
-err_out_unlock:
- spin_unlock(&gre_proto_lock);
err_out:
return -1;
}
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index a13a097..99cf2b4 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1852,7 +1852,9 @@ static int __init ipgre_init(void)
if (err < 0)
return err;
+ rtnl_lock();
err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
+ rtnl_unlock();
if (err < 0) {
pr_info("%s: can't add protocol\n", __func__);
goto add_proto_failed;
@@ -1872,7 +1874,9 @@ out:
tap_ops_failed:
rtnl_link_unregister(&ipgre_link_ops);
rtnl_link_failed:
+ rtnl_lock();
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
+ rtnl_unlock();
add_proto_failed:
unregister_pernet_device(&ipgre_net_ops);
goto out;
@@ -1882,8 +1886,10 @@ static void __exit ipgre_fini(void)
{
rtnl_link_unregister(&ipgre_tap_ops);
rtnl_link_unregister(&ipgre_link_ops);
+ rtnl_lock();
if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0)
pr_info("%s: can't remove protocol\n", __func__);
+ rtnl_unlock();
unregister_pernet_device(&ipgre_net_ops);
}
--
1.7.1
--
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