IPoIB: Test for NULL broadcast object in ipiob_mcast_join_finish()

[cascardo/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index d00a2c1..3f663fb 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -194,7 +194,13 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
        /* Set the cached Q_Key before we attach if it's the broadcast group */
        if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
                    sizeof (union ib_gid))) {
+               spin_lock_irq(&priv->lock);
+               if (!priv->broadcast) {
+                       spin_unlock_irq(&priv->lock);
+                       return -EAGAIN;
+               }
                priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
+               spin_unlock_irq(&priv->lock);
                priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
        }