IPoIB: Do not join broadcast group if interface is brought down

Because the ipoib_workqueue is not flushed when ipoib interface is
brought down, ipoib_mcast_join() may trigger a join to the broadcast
group after priv->broadcast was set to NULL (during cleanup). This
will cause the system to be a member of the broadcast group when
interface is down. As a side effect, this breaks the optimization of
setting the Q_key only when joining the broadcast group.

Signed-off-by: Yossi Etigin <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/ulp/ipoib/ipoib_multicast.c

···
 	if (!priv->broadcast) {
 		struct ipoib_mcast *broadcast;
 
+		if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
+			return;
+
 		broadcast = ipoib_mcast_alloc(dev, 1);
 		if (!broadcast) {
 			ipoib_warn(priv, "failed to allocate broadcast group\n");