From: Laurent Pinchart 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.lede-project.org./?a=commitdiff_plain;h=64ae9958a623708336ed67fe38c33571390aed1e;p=openwrt%2Fstaging%2Fblogic.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 Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 3e0b66efc9ba..516a5b188ea5 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;