IB/ipoib: Fix oops with ipoib_debug_mcast set

Need to set mcast->ah before debug code dereferences it.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index ab40488..b5e6a7b 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -264,6 +264,10 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
                if (!ah) {
                        ipoib_warn(priv, "ib_address_create failed\n");
                } else {
+                       spin_lock_irq(&priv->lock);
+                       mcast->ah = ah;
+                       spin_unlock_irq(&priv->lock);
+
                        ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
                                        " AV %p, LID 0x%04x, SL %d\n",
                                        IPOIB_GID_ARG(mcast->mcmember.mgid),
@@ -271,10 +275,6 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
                                        be16_to_cpu(mcast->mcmember.mlid),
                                        mcast->mcmember.sl);
                }
-
-               spin_lock_irq(&priv->lock);
-               mcast->ah = ah;
-               spin_unlock_irq(&priv->lock);
        }
 
        /* actually send any queued packets */