Merge /spare/repo/linux-2.6/

1 files changed, 31 insertions, 6 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index b8d0c290b0db..1e33cb032e07 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -751,6 +751,7 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 	unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 	unsigned int old_cols, old_rows, old_row_size, old_screen_size;
 	unsigned int new_cols, new_rows, new_row_size, new_screen_size;
+	unsigned int end;
 	unsigned short *newscreen;
 
 	WARN_CONSOLE_UNLOCKED();
@@ -794,20 +795,44 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
 	old_origin = vc->vc_origin;
 	new_origin = (long) newscreen;
 	new_scr_end = new_origin + new_screen_size;
-	if (new_rows < old_rows)
-		old_origin += (old_rows - new_rows) * old_row_size;
+
+	if (vc->vc_y > new_rows) {
+		if (old_rows - vc->vc_y < new_rows) {
+			/*
+			 * Cursor near the bottom, copy contents from the
+			 * bottom of buffer
+			 */
+			old_origin += (old_rows - new_rows) * old_row_size;
+			end = vc->vc_scr_end;
+		} else {
+			/*
+			 * Cursor is in no man's land, copy 1/2 screenful
+			 * from the top and bottom of cursor position
+			 */
+			old_origin += (vc->vc_y - new_rows/2) * old_row_size;
+			end = old_origin + new_screen_size;
+		}
+	} else
+		/*
+		 * Cursor near the top, copy contents from the top of buffer
+		 */
+		end = (old_rows > new_rows) ? old_origin + new_screen_size :
+			vc->vc_scr_end;
 
 	update_attr(vc);
 
-	while (old_origin < vc->vc_scr_end) {
-		scr_memcpyw((unsigned short *) new_origin, (unsigned short *) old_origin, rlth);
+	while (old_origin < end) {
+		scr_memcpyw((unsigned short *) new_origin,
+			    (unsigned short *) old_origin, rlth);
 		if (rrem)
-			scr_memsetw((void *)(new_origin + rlth), vc->vc_video_erase_char, rrem);
+			scr_memsetw((void *)(new_origin + rlth),
+				    vc->vc_video_erase_char, rrem);
 		old_origin += old_row_size;
 		new_origin += new_row_size;
 	}
 	if (new_scr_end > new_origin)
-		scr_memsetw((void *)new_origin, vc->vc_video_erase_char, new_scr_end - new_origin);
+		scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
+			    new_scr_end - new_origin);
 	if (vc->vc_kmalloced)
 		kfree(vc->vc_screenbuf);
 	vc->vc_screenbuf = newscreen;