netdev - [PATCH net v4 2/7] tipc: Introduce __tipc_nl_bearer

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Date:   Wed, 14 Feb 2018 13:37:59 +0800
From:   Ying Xue <ying.xue@...driver.com>
To:     <davem@...emloft.net>, <ktkhai@...tuozzo.com>,
        <jon.maloy@...csson.com>
CC:     <netdev@...r.kernel.org>, <syzkaller-bugs@...glegroups.com>,
        <tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH net v4 2/7] tipc: Introduce __tipc_nl_bearer_disable

Introduce __tipc_nl_bearer_disable() which doesn't hold RTNL lock.

Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
 net/tipc/bearer.c | 19 +++++++++++++------
 net/tipc/bearer.h |  1 +
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index c800147..61b6625 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -813,7 +813,7 @@ int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
-int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
+int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 {
 	int err;
 	char *name;
@@ -835,19 +835,26 @@ int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
 
 	name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
 
-	rtnl_lock();
 	bearer = tipc_bearer_find(net, name);
-	if (!bearer) {
-		rtnl_unlock();
+	if (!bearer)
 		return -EINVAL;
-	}
 
 	bearer_disable(net, bearer);
-	rtnl_unlock();
 
 	return 0;
 }
 
+int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
+{
+	int err;
+
+	rtnl_lock();
+	err = __tipc_nl_bearer_disable(skb, info);
+	rtnl_unlock();
+
+	return err;
+}
+
 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
 {
 	int err;
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index 42d6eee..bcc6d5f 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -188,6 +188,7 @@ extern struct tipc_media udp_media_info;
 #endif
 
 int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
+int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb);
 int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info);
-- 
2.7.4