From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Wed, 26 Sep 2012 11:15:24 +0000 (-0300)
Subject: [media] uvcvideo: Fix control value clamping for unsigned integer controls
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=64ae9958a62;p=linux.git

[media] uvcvideo: Fix control value clamping for unsigned integer controls

V4L2 integer controls are stored in signed 32-bit values. However, UVC
controls can be either signed or unsigned. Take the UVC control
signedness into account when clamping the control value to the min-max
range.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 3e0b66efc9ba4..516a5b188ea52 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1455,8 +1455,12 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
 		if (step == 0)
 			step = 1;
 
-		xctrl->value = min + (xctrl->value - min + step/2) / step * step;
-		xctrl->value = clamp(xctrl->value, min, max);
+		xctrl->value = min + ((u32)(xctrl->value - min) + step / 2)
+			     / step * step;
+		if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED)
+			xctrl->value = clamp(xctrl->value, min, max);
+		else
+			xctrl->value = clamp_t(u32, xctrl->value, min, max);
 		value = xctrl->value;
 		break;