[PATCH net/net-next] bonding:Don't received packets if bonding is not up

[<lichunhe@huawei.com>]

From: Chunhe Li <lichunhe@huawei.com>

If the bonding device is down, it should not receive packets 
to network stack or other upper flow stack.

Signed-off-by: Chunhe Li <lichunhe@huawei.com>
---
 drivers/net/bonding/bond_main.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 701f86c..48a127b 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1110,6 +1110,12 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
 	int (*recv_probe)(const struct sk_buff *, struct bonding *,
 			  struct slave *);
 	int ret = RX_HANDLER_ANOTHER;
+
+	slave = bond_slave_get_rcu(skb->dev);
+	bond = slave->bond;
+
+	if (unlikely(!(bond->dev->flags & IFF_UP)))
+		return RX_HANDLER_PASS;
 
 	skb = skb_share_check(skb, GFP_ATOMIC);
 	if (unlikely(!skb))
@@ -1117,9 +1123,6 @@ static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
 
 	*pskb = skb;
 
-	slave = bond_slave_get_rcu(skb->dev);
-	bond = slave->bond;
-
 	recv_probe = ACCESS_ONCE(bond->recv_probe);
 	if (recv_probe) {
 		ret = recv_probe(skb, bond, slave);
-- 
1.9.2.0