[PATCH] drm/udl: Fix for the X server screen update v3

[poma]

Within X server, on top of DisplayLink GPU USB2.0 device,
screen content is not refreshed i.e. updated.

This fixes commit:

- e375882406d0cc24030746638592004755ed4ae0
  "drm/udl: Use drm_fb_helper deferred_io support"

Thanks Noralf and Daniel for the comments.

Tested-by: poma <poma at gmail.com>
---
 drivers/gpu/drm/udl/udl_fb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index d5df555..cc2daba 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -122,7 +122,7 @@ int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
 		return 0;
 	cmd = urb->transfer_buffer;
 
-	for (i = y; i < height ; i++) {
+	for (i = y; i < y + height ; i++) {
 		const int line_offset = fb->base.pitches[0] * i;
 		const int byte_offset = line_offset + (x * bpp);
 		const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
-- 
2.7.4