[PATCH] video/console: Clip the right margin clear to the visible region

For some unknown reason, yres_virtual was 2x larger the the size specified
by i915 and so when blit_clear_margins() tried to clear the full virtual
right-hand margin it tried to write far beyond the end of the buffer.

This limits the clear to only the visible portion of the right-hand
margin, similar to how the bottom margin is treated.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id8138
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Chris Wilson <redacted>
---
 drivers/video/console/bitblit.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/console/bitblit.c b/drivers/video/console/bitblit.c
index 28b1a83..9f89e5a 100644
--- a/drivers/video/console/bitblit.c
+++ b/drivers/video/console/bitblit.c

@@ -219,9 +219,9 @@ static void bit_clear_margins(struct vc_data *vc, struct fb_info *info,
 
 	if (rw && !bottom_only) {
 		region.dx = info->var.xoffset + rs;
-		region.dy = 0;
+		region.dy = info->var.yoffset;
 		region.width = rw;
-		region.height = info->var.yres_virtual;
+		region.height = info->var.yres;
 		info->fbops->fb_fillrect(info, &region);
 	}
 

-- 
1.7.9.1