media: vivid: fix wrong pixel_array control size

commit 3e43442 upstream.

The pixel_array control size was calculated incorrectly:
the dimensions were swapped (dims[0] should be the height), and the
values should be the width or height divided by PIXEL_ARRAY_DIV
and rounded up. So don't use roundup, but use DIV_ROUND_UP instead.

This bug is harmless in the sense that nothing will break, except that
it consumes way too much memory for this control.

Fixes: 6bc7643 ("media: vivid: add pixel_array test control")
Cc: <stable@vger.kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: hverkuil

drivers/media/test-drivers/vivid/vivid-ctrls.c

@@ -244,7 +244,8 @@ static const struct v4l2_ctrl_config vivid_ctrl_u8_pixel_array = {
 	.min = 0x00,
 	.max = 0xff,
 	.step = 1,
-	.dims = { 640 / PIXEL_ARRAY_DIV, 360 / PIXEL_ARRAY_DIV },
+	.dims = { DIV_ROUND_UP(360, PIXEL_ARRAY_DIV),
+		  DIV_ROUND_UP(640, PIXEL_ARRAY_DIV) },
 };
 
 static const struct v4l2_ctrl_config vivid_ctrl_s32_array = {

drivers/media/test-drivers/vivid/vivid-vid-cap.c

@@ -454,8 +454,8 @@ void vivid_update_format_cap(struct vivid_dev *dev, bool keep_controls)
 	if (keep_controls)
 		return;
 
-	dims[0] = roundup(dev->src_rect.width, PIXEL_ARRAY_DIV);
-	dims[1] = roundup(dev->src_rect.height, PIXEL_ARRAY_DIV);
+	dims[0] = DIV_ROUND_UP(dev->src_rect.height, PIXEL_ARRAY_DIV);
+	dims[1] = DIV_ROUND_UP(dev->src_rect.width, PIXEL_ARRAY_DIV);
 	v4l2_ctrl_modify_dimensions(dev->pixel_array, dims);
 }