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authorAntonino A. Daplas <adaplas@gmail.com>2005-11-21 21:32:25 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-22 09:13:43 -0800
commitb4627dea032ab1f6e472fcf030e28f22ea971f9b (patch)
treecf4a6509616f137e46098bbbb0573194b4ef0af5 /drivers/video/console
parent74a8a65c526187fe636a6a2abcb7d9ebc5c753ab (diff)
[PATCH] fbcon: Console Rotation - Fix wrong shift calculation
The shift value (amount to shift the bitmap so first pixel starts at origin(0,0)) is incorrect. This causes corrupted characters or a kernel crash if fontwidth is not divisible by 8 at 270 degrees, or fontheight not divisible by 8 at 180 degrees. Report and part of the fix contributed by Knut Petersen. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/console')
-rw-r--r--drivers/video/console/fbcon_rotate.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/console/fbcon_rotate.h b/drivers/video/console/fbcon_rotate.h
index 90c672096c2..e504fbf5c60 100644
--- a/drivers/video/console/fbcon_rotate.h
+++ b/drivers/video/console/fbcon_rotate.h
@@ -49,7 +49,7 @@ static inline void pattern_set_bit(u32 x, u32 y, u32 pitch, char *pat)
static inline void rotate_ud(const char *in, char *out, u32 width, u32 height)
{
int i, j;
- int shift = width % 8;
+ int shift = (8 - (width % 8)) & 7;
width = (width + 7) & ~7;
@@ -85,7 +85,7 @@ static inline void rotate_cw(const char *in, char *out, u32 width, u32 height)
static inline void rotate_ccw(const char *in, char *out, u32 width, u32 height)
{
int i, j, h = height, w = width;
- int shift = width % 8;
+ int shift = (8 - (width % 8)) & 7;
width = (width + 7) & ~7;
height = (height + 7) & ~7;