netdev - [PATCH net v4 5/7] tipc: Introduce __tipc_nl_media

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Date:   Wed, 14 Feb 2018 13:38:02 +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 5/7] tipc: Introduce __tipc_nl_media_set

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

Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
 net/tipc/bearer.c | 23 ++++++++++++++---------
 net/tipc/bearer.h |  1 +
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index f92c9c5..3e3dce3 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -1130,7 +1130,7 @@ int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
-int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
+int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
 {
 	int err;
 	char *name;
@@ -1148,22 +1148,17 @@ int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
 		return -EINVAL;
 	name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
 
-	rtnl_lock();
 	m = tipc_media_find(name);
-	if (!m) {
-		rtnl_unlock();
+	if (!m)
 		return -EINVAL;
-	}
 
 	if (attrs[TIPC_NLA_MEDIA_PROP]) {
 		struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
 
 		err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
 					      props);
-		if (err) {
-			rtnl_unlock();
+		if (err)
 			return err;
-		}
 
 		if (props[TIPC_NLA_PROP_TOL])
 			m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
@@ -1172,7 +1167,17 @@ int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
 		if (props[TIPC_NLA_PROP_WIN])
 			m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
 	}
-	rtnl_unlock();
 
 	return 0;
 }
+
+int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
+{
+	int err;
+
+	rtnl_lock();
+	err = __tipc_nl_media_set(skb, info);
+	rtnl_unlock();
+
+	return err;
+}
diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index cc0f529..a53613d 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -200,6 +200,7 @@ int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb);
 int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info);
 int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
+int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info);
 
 int tipc_media_set_priority(const char *name, u32 new_value);
 int tipc_media_set_window(const char *name, u32 new_value);
-- 
2.7.4