bonding: 802.3ad - fix agg_device_up

The slave member of struct aggregator does not necessarily point
to a slave which is part of the aggregator. It points to the
slave structure containing the aggregator structure, while
completely different slaves (or no slaves at all) may be part of
the aggregator.

The agg_device_up() function wrongly uses agg->slave to find the state
of the aggregator.  Use agg->lag_ports->slave instead. The bug has
been introduced by commit 0b8470e8f89c2777a37c330150a42e64c2f1ceb7
("bonding: fix link down handling in 802.3ad mode").

Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 494bf960442d3ff533507661ce394d0d128a3d6f..31912f17653f74173368e36a03c924a4b1443975 100644 (file)
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -1482,8 +1482,11 @@ static struct aggregator *ad_agg_selection_test(struct aggregator *best,
 
 static int agg_device_up(const struct aggregator *agg)
 {
-       return (netif_running(agg->slave->dev) &&
-               netif_carrier_ok(agg->slave->dev));
+       struct port *port = agg->lag_ports;
+       if (!port)
+               return 0;
+       return (netif_running(port->slave->dev) &&
+               netif_carrier_ok(port->slave->dev));
 }
 
 /**