[PATCH] IPoIB: fix static rate calculation

[~andy/linux] / 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 f46932dc81c94385550e5d4534c332a9b0cb0b51..70208c3d21e28d415a8f9a82f886e62b64c4590d 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -258,13 +258,12 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
                                .traffic_class = mcast->mcmember.traffic_class
                        }
                };
+               int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
 
                av.grh.dgid = mcast->mcmember.mgid;
 
-               if (ib_sa_rate_enum_to_int(mcast->mcmember.rate) > 0)
-                       av.static_rate = (2 * priv->local_rate -
-                                         ib_sa_rate_enum_to_int(mcast->mcmember.rate) - 1) /
-                               (priv->local_rate ? priv->local_rate : 1);
+               if (path_rate > 0 && priv->local_rate > path_rate)
+                       av.static_rate = (priv->local_rate - 1) / path_rate;
 
                ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
                                av.static_rate, priv->local_rate,