[PATCH 2.6.19 2/6] tgafb: Fix copying overlapping areas
- From: "Maciej W. Rozycki" <macro@xxxxxxxxxxxxxx>
- Date: Wed, 13 Dec 2006 17:10:36 +0000 (GMT)
The direction of copying in the copyarea functions is selected
incorrectly, resulting in corruption. This is a fix.
Signed-off-by: Maciej W. Rozycki <macro@xxxxxxxxxxxxxx>
---
It looks like these functions are not used by the console code as image
blitting is preferred for scrolling and hence the bug has escaped
unnoticed for so long. Still it is not an excuse for these functions to
be wrong.
Please apply.
Maciej
patch-mips-2.6.18-20060920-tgafb-copyarea-1
diff -up --recursive --new-file linux-mips-2.6.18-20060920.macro/drivers/video/tgafb.c linux-mips-2.6.18-20060920/drivers/video/tgafb.c
--- linux-mips-2.6.18-20060920.macro/drivers/video/tgafb.c 2006-09-20 20:50:52.000000000 +0000
+++ linux-mips-2.6.18-20060920/drivers/video/tgafb.c 2006-12-12 05:15:28.000000000 +0000
@@ -919,7 +919,7 @@ copyarea_line_8bpp(struct fb_info *info,
n64 = (height * width) / 64;
- if (dy < sy) {
+ if (sy < dy) {
spos = (sy + height) * width;
dpos = (dy + height) * width;
@@ -967,7 +967,7 @@ copyarea_line_32bpp(struct fb_info *info
n16 = (height * width) / 16;
- if (dy < sy) {
+ if (sy < dy) {
src = tga_fb + (sy + height) * width * 4;
dst = tga_fb + (dy + height) * width * 4;
-
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