diff --git a/drivers/staging/comedi/drivers/serial2002.c b/drivers/staging/comedi/drivers/serial2002.c
index b7779468d75f5d9985682e09d9400aa0c9f9968e..0d33e520f6350f599d8e2d3b7a6a4a2e561ce960 100644
--- a/drivers/staging/comedi/drivers/serial2002.c
+++ b/drivers/staging/comedi/drivers/serial2002.c
@@ -379,7 +379,10 @@ static int serial2002_setup_subdevice(struct comedi_subdevice *s,
 				range_table_list[chan] =
 				    (const struct comedi_lrange *)&range[j];
 			}
-			maxdata_list[chan] = ((long long)1 << cfg[j].bits) - 1;
+			if (cfg[j].bits < 32)
+				maxdata_list[chan] = (1u << cfg[j].bits) - 1;
+			else
+				maxdata_list[chan] = 0xffffffff;
 			chan++;
 		}
 	}