vt/fbcon: fix background color on line feed

[Jan Engelhardt]

commit 181afd9c4e2168f59761fd3d153b46a0c32810a3
Author: Jan Engelhardt <jengelh@xxxxxxxxxx>
Date:   Sat May 10 10:16:56 2008 +0200

vt/fbcon: fix background color on line feed

Addendum to commit c9e587ab.
fbcon still was not doing the right thing (read: continued to do old
behavior). fbcon_clear() seems to clear the new line (e.g. where your
new prompt appears after doing echo -en "\e[42mfoo\n"), while
scr_memsetw clears the previous one only (where "foo" appears). So
just temporarily set the video_erase_char to the scrl_erase_char so
that fbcon_clear does the right thing.

Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxx>
---
 drivers/video/console/fbcon.c |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c
index 774f803..c77c2fd 100644
--- a/drivers/video/console/fbcon.c
+++ b/drivers/video/console/fbcon.c
@@ -1854,6 +1854,8 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 	struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];
 	struct display *p = &fb_display[vc->vc_num];
 	int scroll_partial = info->flags & FBINFO_PARTIAL_PAN_OK;
+	unsigned short saved_ec;
+	int ret;
 
 	if (fbcon_is_inactive(vc, info))
 		return -EINVAL;
@@ -1866,6 +1868,11 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 	 *           whole screen (prevents flicker).
 	 */
 
+	saved_ec = vc->vc_video_erase_char;
+	vc->vc_video_erase_char = vc->vc_scrl_erase_char;
+
+	ret = 0;
+
 	switch (dir) {
 	case SM_UP:
 		if (count > vc->vc_rows)	/* Maximum realistic size */
@@ -1884,7 +1891,7 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 							(b - count)),
 				    vc->vc_scrl_erase_char,
 				    vc->vc_size_row * count);
-			return 1;
+			ret = 1;
 			break;
 
 		case SCROLL_WRAP_MOVE:
@@ -1956,7 +1963,8 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 							(b - count)),
 				    vc->vc_scrl_erase_char,
 				    vc->vc_size_row * count);
-			return 1;
+			ret = 1;
+			break;
 		}
 		break;
 
@@ -1975,7 +1983,7 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 							t),
 				    vc->vc_scrl_erase_char,
 				    vc->vc_size_row * count);
-			return 1;
+			ret = 1;
 			break;
 
 		case SCROLL_WRAP_MOVE:
@@ -2045,10 +2053,13 @@ static int fbcon_scroll(struct vc_data *vc, int t, int b, int dir,
 							t),
 				    vc->vc_scrl_erase_char,
 				    vc->vc_size_row * count);
-			return 1;
+			ret = 1;
+			break;
 		}
+		break;
 	}
-	return 0;
+	vc->vc_video_erase_char = saved_ec;
+	return ret;
 }
 
 
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