diff --git a/drivers/staging/comedi/drivers/pcl711.c b/drivers/staging/comedi/drivers/pcl711.c
index ef3ebeef7a4d69194c2f3337324d0606743e9aaf..d879052b1b23adb25cb77d6643a01697632f9618 100644
--- a/drivers/staging/comedi/drivers/pcl711.c
+++ b/drivers/staging/comedi/drivers/pcl711.c
@@ -295,8 +295,8 @@ static int pcl711_ai_cmdtest(struct comedi_device *dev,
 			     struct comedi_subdevice *s, struct comedi_cmd *cmd)
 {
 	struct pcl711_private *devpriv = dev->private;
-	int tmp;
 	int err = 0;
+	unsigned int arg;
 
 	/* Step 1 : check if triggers are trivially valid */
 
@@ -344,14 +344,12 @@ static int pcl711_ai_cmdtest(struct comedi_device *dev,
 	/* step 4 */
 
 	if (cmd->scan_begin_src == TRIG_TIMER) {
-		tmp = cmd->scan_begin_arg;
+		arg = cmd->scan_begin_arg;
 		i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
 					  &devpriv->divisor1,
 					  &devpriv->divisor2,
-					  &cmd->scan_begin_arg,
-					  cmd->flags);
-		if (tmp != cmd->scan_begin_arg)
-			err++;
+					  &arg, cmd->flags);
+		err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
 	}
 
 	if (err)