[PATCH v17 14/17] media: uvcvideo: Introduce uvc_mapping_v4l2_size

[Ricardo Ribalda <ribalda@chromium.org>]

Centralize the calculation for the v4l2_size of a mapping.

Reviewed-by: Yunke Cao <yunkec@google.com>
Tested-by: Yunke Cao <yunkec@google.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index d50137d19561..17a7ce525f71 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1471,6 +1471,14 @@ static int __uvc_queryctrl_boundaries(struct uvc_video_chain *chain,
 	return 0;
 }
 
+static size_t uvc_mapping_v4l2_size(struct uvc_control_mapping *mapping)
+{
+	if (uvc_ctrl_mapping_is_compound(mapping))
+		return DIV_ROUND_UP(mapping->size, 8);
+
+	return sizeof(s32);
+}
+
 static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 				 struct uvc_control *ctrl,
 				 struct uvc_control_mapping *mapping,
@@ -1512,7 +1520,7 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
 			v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
 	}
 
-	v4l2_ctrl->elem_size = sizeof(s32);
+	v4l2_ctrl->elem_size = uvc_mapping_v4l2_size(mapping);
 	v4l2_ctrl->elems = 1;
 
 	if (v4l2_ctrl->type >= V4L2_CTRL_COMPOUND_TYPES) {
@@ -2144,7 +2152,7 @@ static int uvc_mapping_get_xctrl_compound(struct uvc_video_chain *chain,
 		return -EINVAL;
 	}
 
-	size = DIV_ROUND_UP(mapping->size, 8);
+	size = uvc_mapping_v4l2_size(mapping);
 	if (xctrl->size < size) {
 		xctrl->size = size;
 		return -ENOSPC;
@@ -2327,9 +2335,8 @@ static int uvc_mapping_set_xctrl_compound(struct uvc_control *ctrl,
 					  struct v4l2_ext_control *xctrl)
 {
 	u8 *data __free(kfree) = NULL;
-	size_t size;
+	size_t size = uvc_mapping_v4l2_size(mapping);
 
-	size = DIV_ROUND_UP(mapping->size, 8);
 	if (xctrl->size != size)
 		return -EINVAL;
 

-- 
2.48.1.362.g079036d154-goog