staging: comedi: rtd520: Prefer using macro DIV_ROUND_UP

The macro DIV_ROUND_UP performs the computation
(((n) + (d) - 1) /(d)). It clarifies the divisor calculations.
This was done using the coccinelle script:
@@
expression e1;
expression e2;
@@
(
- ((e1) + e2 - 1) / (e2)
+ DIV_ROUND_UP(e1,e2)
|
- ((e1) + (e2 - 1)) / (e2)
+ DIV_ROUND_UP(e1,e2)
)

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
index 68ac02b..9b6c567 100644 (file)
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -892,9 +892,8 @@ static int rtd_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
                                devpriv->xfer_count = cmd->chanlist_len;
                        } else {        /* make a multiple of scan length */
                                devpriv->xfer_count =
-                                   (devpriv->xfer_count +
-                                    cmd->chanlist_len - 1)
-                                   / cmd->chanlist_len;
+                                   DIV_ROUND_UP(devpriv->xfer_count,
+                                                cmd->chanlist_len);
                                devpriv->xfer_count *= cmd->chanlist_len;
                        }
                        devpriv->flags |= SEND_EOS;