linux-kernel - [PATCH] usb: musb: cppi_dma.c: use DIV_ROUND_UP macro in cppi_next_(r|t)x

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Message-Id: <20170215081236.19340-1-insafonov@gmail.com>
Date:   Wed, 15 Feb 2017 11:12:36 +0300
From:   Ivan Safonov <insafonov@...il.com>
To:     Bin Liu <b-liu@...com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ivan Safonov <insafonov@...il.com>
Subject: [PATCH] usb: musb: cppi_dma.c: use DIV_ROUND_UP macro in cppi_next_(r|t)x_segment()

DIV_ROUND_UP is bit useful than series of "/" and "%" operations.
Replace "/%" sequence with DIV_ROUND_UP macro.

Signed-off-by: Ivan Safonov <insafonov@...il.com>
---
 drivers/usb/musb/cppi_dma.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/musb/cppi_dma.c b/drivers/usb/musb/cppi_dma.c
index 1ae48e6..d376188 100644
--- a/drivers/usb/musb/cppi_dma.c
+++ b/drivers/usb/musb/cppi_dma.c
@@ -582,9 +582,9 @@ cppi_next_tx_segment(struct musb *musb, struct cppi_channel *tx)
 		maxpacket = length;
 		n_bds = 1;
 	} else {
-		n_bds = length / maxpacket;
-		if (!length || (length % maxpacket))
-			n_bds++;
+		n_bds = DIV_ROUND_UP(length, maxpacket);
+		if (length == 0)
+			n_bds = 1;
 		n_bds = min(n_bds, (unsigned) NUM_TXCHAN_BD);
 		length = min(n_bds * maxpacket, length);
 	}
@@ -790,9 +790,7 @@ cppi_next_rx_segment(struct musb *musb, struct cppi_channel *rx, int onepacket)
 			n_bds = 0xffff / maxpacket;
 			length = n_bds * maxpacket;
 		} else {
-			n_bds = length / maxpacket;
-			if (length % maxpacket)
-				n_bds++;
+			n_bds = DIV_ROUND_UP(length, maxpacket);
 		}
 		if (n_bds == 1)
 			onepacket = 1;
-- 
2.10.2