MAINTAINERS: Add cxgb4 and iw_cxgb4 entries

Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/cxgb4/provider.c b/drivers/infiniband/hw/cxgb4/provider.c
index 3cb50af..dfc4902 100644
--- a/drivers/infiniband/hw/cxgb4/provider.c
+++ b/drivers/infiniband/hw/cxgb4/provider.c
@@ -267,8 +267,8 @@
 	props->max_qp_wr = T4_MAX_QP_DEPTH;
 	props->max_sge = T4_MAX_RECV_SGE;
 	props->max_sge_rd = 1;
-	props->max_qp_rd_atom = T4_MAX_READ_DEPTH;
-	props->max_qp_init_rd_atom = T4_MAX_READ_DEPTH;
+	props->max_qp_rd_atom = c4iw_max_read_depth;
+	props->max_qp_init_rd_atom = c4iw_max_read_depth;
 	props->max_cq = T4_MAX_NUM_CQ;
 	props->max_cqe = T4_MAX_CQ_DEPTH;
 	props->max_mr = c4iw_num_stags(&dev->rdev);