IPoIB: Rejoin all multicast groups after a port event

When ipoib_ib_dev_flush() is called because of a port event, the
driver needs to rejoin all multicast groups, since the flush will call
ipoib_mcast_dev_flush() (via ipoib_ib_dev_down()).  Otherwise no
(non-broadcast) multicast groups will be rejoined until the networking
core calls ->set_multicast_list again, and so multicast reception will
be broken for potentially a long time.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 722177ea069b..240befdf90dc 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -631,8 +631,10 @@ void ipoib_ib_dev_flush(void *_dev)
          * The device could have been brought down between the start and when
          * we get here, don't bring it back up if it's not configured up
          */
-        if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
+        if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
                 ipoib_ib_dev_up(dev);
+                ipoib_mcast_restart_task(dev);
+        }
 
         mutex_lock(&priv->vlan_mutex);