netdev - [PATCH net-next 09/10] tipc: use node_list_lock to protect tipc_num

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Date:	Thu, 27 Mar 2014 12:54:38 +0800
From:	Ying Xue <ying.xue@...driver.com>
To:	<davem@...emloft.net>
CC:	<jon.maloy@...csson.com>, <Paul.Gortmaker@...driver.com>,
	<erik.hugne@...csson.com>, <netdev@...r.kernel.org>,
	<tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH net-next 09/10] tipc: use node_list_lock to protect tipc_num_nodes variable

As tipc_node_list is protected by rcu read lock on read side, it's
unnecessary to hold node_list_lock to protect tipc_node_list in
tipc_node_get_links(). Instead, node_list_lock should just protects
tipc_num_nodes in the function.

Signed-off-by: Ying Xue <ying.xue@...driver.com>
Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
---
 net/tipc/node.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 4f517ff..85405a6 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -352,11 +352,11 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
 		return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
 						   " (too many nodes)");
 	}
+	spin_unlock_bh(&node_list_lock);
+
 	buf = tipc_cfg_reply_alloc(payload_size);
-	if (!buf) {
-		spin_unlock_bh(&node_list_lock);
+	if (!buf)
 		return NULL;
-	}
 
 	/* Add TLVs for all nodes in scope */
 	rcu_read_lock();
@@ -369,7 +369,6 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
 				    &node_info, sizeof(node_info));
 	}
 	rcu_read_unlock();
-	spin_unlock_bh(&node_list_lock);
 	return buf;
 }
 
-- 
1.7.9.5

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