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[PATCH] fbcon: Console Rotation - Fix wrong shift calculation

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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>
This commit is contained in:
Antonino A. Daplas 2005-11-21 21:32:25 -08:00 committed by Linus Torvalds
parent 74a8a65c52
commit b4627dea03
1 changed files with 2 additions and 2 deletions
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4
drivers/video/console/fbcon_rotate.h
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@ -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;