diff --git a/drivers/staging/comedi/drivers/adv_pci1710.c b/drivers/staging/comedi/drivers/adv_pci1710.c
index a459bdf7e35255127043fe2f2e04e182e49d86ac..602b7a1e40e6d8963564600f8f035cfe70ea835c 100644
--- a/drivers/staging/comedi/drivers/adv_pci1710.c
+++ b/drivers/staging/comedi/drivers/adv_pci1710.c
@@ -971,7 +971,7 @@ static int pci171x_ai_cmdtest(struct comedi_device *dev,
 	const struct boardtype *this_board = comedi_board(dev);
 	struct pci1710_private *devpriv = dev->private;
 	int err = 0;
-	int tmp;
+	unsigned int arg;
 
 	/* Step 1 : check if triggers are trivially valid */
 
@@ -1019,15 +1019,12 @@ static int pci171x_ai_cmdtest(struct comedi_device *dev,
 	/* step 4: fix up any arguments */
 
 	if (cmd->convert_src == TRIG_TIMER) {
-		tmp = cmd->convert_arg;
+		arg = cmd->convert_arg;
 		i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
 					  &devpriv->next_divisor1,
 					  &devpriv->next_divisor2,
-					  &cmd->convert_arg, cmd->flags);
-		if (cmd->convert_arg < this_board->ai_ns_min)
-			cmd->convert_arg = this_board->ai_ns_min;
-		if (tmp != cmd->convert_arg)
-			err++;
+					  &arg, cmd->flags);
+		err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
 	}
 
 	if (err)