netdev - [PATCH -next] tipc: fix imbalance read_unlock_bh in __tipc_nl_add

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Date:	Thu, 28 Jul 2016 02:07:49 +0000
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	Jon Maloy <jon.maloy@...csson.com>,
	Ying Xue <ying.xue@...driver.com>,
	Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@...csson.com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	Wei Yongjun <weiyj.lk@...il.com>, netdev@...r.kernel.org,
	tipc-discussion@...ts.sourceforge.net
Subject: [PATCH -next] tipc: fix imbalance read_unlock_bh in __tipc_nl_add_monitor()

In the error handling case of nla_nest_start() failed read_unlock_bh()
is called  to unlock a lock that had not been taken yet. sparse warns
about the context imbalance as the following:

net/tipc/monitor.c:799:23: warning:
 context imbalance in '__tipc_nl_add_monitor' - different lock contexts for basic block

Fixes: cf6f7e1d5109 ('tipc: dump monitor attributes')
Signed-off-by: Wei Yongjun <weiyj.lk@...il.com>
---
 net/tipc/monitor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/monitor.c b/net/tipc/monitor.c
index be70a57..b62caa1 100644
--- a/net/tipc/monitor.c
+++ b/net/tipc/monitor.c
@@ -794,10 +794,10 @@ int __tipc_nl_add_monitor(struct net *net, struct tipc_nl_msg *msg,
 	return 0;
 
 attr_msg_full:
+	read_unlock_bh(&mon->lock);
 	nla_nest_cancel(msg->skb, attrs);
 msg_full:
 	genlmsg_cancel(msg->skb, hdr);
-	read_unlock_bh(&mon->lock);
 
 	return -EMSGSIZE;
 }