1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_qp.c b/drivers/infiniband/hw/ipath/ipath_qp.c
index bfef08ecd342..9e07abba8aa7 100644
--- a/drivers/infiniband/hw/ipath/ipath_qp.c
+++ b/drivers/infiniband/hw/ipath/ipath_qp.c
@@ -507,8 +507,13 @@ int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
                     attr->port_num > ibqp->device->phys_port_cnt)
                         goto inval;
 
+        /*
+         * Note: the chips support a maximum MTU of 4096, but the driver
+         * hasn't implemented this feature yet, so don't allow Path MTU
+         * values greater than 2048.
+         */
         if (attr_mask & IB_QP_PATH_MTU)
-                if (attr->path_mtu > IB_MTU_4096)
+                if (attr->path_mtu > IB_MTU_2048)
                         goto inval;
 
         if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)