linux-kernel - [PATCH 3/4] media: uvcvideo: Use DIV_ROUND

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Message-ID: <1567700092-27769-4-git-send-email-zhongjiang@huawei.com>
Date:   Fri, 6 Sep 2019 00:14:51 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     <mchehab@...nel.org>
CC:     <hansverk@...co.com>, <daniel.vetter@...ll.ch>,
        <zhongjiang@...wei.com>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/4] media: uvcvideo: Use DIV_ROUND_CLOSEST directly to make it readable

The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d
but is perhaps more readable.

Signed-off-by: zhong jiang <zhongjiang@...wei.com>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e399b9f..9f3697161 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1604,8 +1604,8 @@ int uvc_ctrl_set(struct uvc_fh *handle,
 		if (step == 0)
 			step = 1;
 
-		xctrl->value = min + ((u32)(xctrl->value - min) + step / 2)
-			     / step * step;
+		xctrl->value = min + DIV_ROUND_CLOSEST((u32)(xctrl->value - min),
+							step) * step;
 		if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
 			xctrl->value = clamp(xctrl->value, min, max);
 		else
-- 
1.7.12.4