Oct 08 2014

staging: comedi: use DIV_ROUND_UP 

Author: Tapasweni Pathak <tapaswenipathak@gmail.com>

The kernel.h macro DIV_ROUND_UP performs the computation (((n) + (d) - 1) /
(d)) but is perhaps more readable.

Coccinelle script used :

// 
@haskernel@
@@
@depends on haskernel@
expression n,d;
@@
(
- (n + d - 1) / d
+ DIV_ROUND_UP(n,d)
|
- (n + (d - 1)) / d
+ DIV_ROUND_UP(n,d)
)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP((n),d)
+ DIV_ROUND_UP(n,d)
@depends on haskernel@
expression n,d;
@@
- DIV_ROUND_UP(n,(d))
+ DIV_ROUND_UP(n,d)
// 

Signed-off-by: Tapasweni Pathak 
Signed-off-by: Greg Kroah-Hartman 

---
 drivers/staging/comedi/drivers.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
 
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
index 3e5bccb..859b722 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -317,8 +317,7 @@ unsigned int comedi_bytes_per_scan(struct comedi_subdevice *s)
 	case COMEDI_SUBD_DO:
 	case COMEDI_SUBD_DIO:
 		bits_per_sample = 8 * bytes_per_sample(s);
-		num_samples = (cmd->chanlist_len + bits_per_sample - 1) /
-				bits_per_sample;
+		num_samples = DIV_ROUND_UP(cmd->chanlist_len, bits_per_sample);
 		break;
 	default:
 		num_samples = cmd->chanlist_len;

qlambert