diff --git a/drivers/comedi/drivers/pcmuio.c b/drivers/comedi/drivers/pcmuio.c
index 33b24dbbb919..0995911a3ea3 100644
--- a/drivers/comedi/drivers/pcmuio.c
+++ b/drivers/comedi/drivers/pcmuio.c
@@ -521,11 +521,12 @@ static int pcmuio_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 	const struct pcmuio_board *board = dev->board_ptr;
 	struct comedi_subdevice *s;
 	struct pcmuio_private *devpriv;
+	unsigned int io_len = board->num_asics * PCMUIO_ASIC_IOSIZE;
 	int ret;
 	int i;
 
-	ret = comedi_request_region(dev, it->options[0],
-				    board->num_asics * PCMUIO_ASIC_IOSIZE);
+	ret = comedi_check_request_region(dev, it->options[0], io_len,
+					  0, 0xffff, io_len);
 	if (ret)
 		return ret;