From: Ying Xue <ying.xue@windriver.com>
Date: Thu, 27 Mar 2014 04:54:38 +0000 (+0800)
Subject: tipc: use node_list_lock to protect tipc_num_nodes variable
X-Git-Tag: v3.15-rc1~113^2~66^2~1
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=2220646a53aa588798653232e26172ec36ab06cd;p=linux.git

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@windriver.com>
Reviewed-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 4f517ff783d9..85405a6e3076 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;
 }