diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index 4f5dd66da39d..bdbf54d517d9 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -263,6 +263,9 @@ static int build_immd(struct t4_sq *sq, struct fw_ri_immd *immdp,
 			rem -= len;
 		}
 	}
+	len = roundup(plen + sizeof *immdp, 16) - (plen + sizeof *immdp);
+	if (len)
+		memset(dstp, 0, len);
 	immdp->op = FW_RI_DATA_IMMD;
 	immdp->r1 = 0;
 	immdp->r2 = 0;
@@ -292,6 +295,7 @@ static int build_isgl(__be64 *queue_start, __be64 *queue_end,
 		if (++flitp == queue_end)
 			flitp = queue_start;
 	}
+	*flitp = (__force __be64)0;
 	isglp->op = FW_RI_DATA_ISGL;
 	isglp->r1 = 0;
 	isglp->nsge = cpu_to_be16(num_sge);