IB/mlx4: Fix flow label returned from query QP

Correct the mask used to get the flow label, since the field is 20 bits, 
not 24 bits.

Found by Dotan Barak and Yaron Gepstein of Mellanox. 

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 40042184ad58..2d00b4ee80c0 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1515,7 +1515,7 @@ static void to_ib_ah_attr(struct mlx4_dev *dev, struct ib_ah_attr *ib_ah_attr,
                 ib_ah_attr->grh.traffic_class =
                         (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
                 ib_ah_attr->grh.flow_label =
-                        be32_to_cpu(path->tclass_flowlabel) & 0xffffff;
+                        be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
                 memcpy(ib_ah_attr->grh.dgid.raw,
                         path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
         }