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[PATCH] fbdev: Possible endian fix in cfbimageblit 

Fix possible endian bug(?) when bit testing in slow_imageblit().  This
function is rarely called (only if (width * bpp) % 32 != 0) thus the bug is
not triggered.

However, if the console is rotated at 90 or 270 degrees, the height becomes
the width, and a variety of fonts have heights that will force a call to
slow_imageblit().

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 2005-11-08 21:39:17 -08:00 committed by Linus Torvalds
parent 120ddb41f1
commit 81d3e147ec
1 changed files with 3 additions and 1 deletions
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4
drivers/video/cfbimgblt.c
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@ -80,10 +80,12 @@ static u32 cfb_tab32[] = {
#define LEFT_POS(bpp) (32 - bpp) #define LEFT_POS(bpp) (32 - bpp)
#define SHIFT_HIGH(val, bits) ((val) >> (bits)) #define SHIFT_HIGH(val, bits) ((val) >> (bits))
#define SHIFT_LOW(val, bits) ((val) << (bits)) #define SHIFT_LOW(val, bits) ((val) << (bits))
#define BIT_NR(b) (7 - (b))
#else #else
#define LEFT_POS(bpp) (0) #define LEFT_POS(bpp) (0)
#define SHIFT_HIGH(val, bits) ((val) << (bits)) #define SHIFT_HIGH(val, bits) ((val) << (bits))
#define SHIFT_LOW(val, bits) ((val) >> (bits)) #define SHIFT_LOW(val, bits) ((val) >> (bits))
#define BIT_NR(b) (b)
#endif #endif
static inline void color_imageblit(const struct fb_image *image, static inline void color_imageblit(const struct fb_image *image,
@ -177,7 +179,7 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info *
while (j--) { while (j--) {
l--; l--;
color = (*s & (1 << l)) ? fgcolor : bgcolor; color = (*s & 1 << (BIT_NR(l))) ? fgcolor : bgcolor;
color <<= LEFT_POS(bpp); color <<= LEFT_POS(bpp);
val |= SHIFT_HIGH(color, shift); val |= SHIFT_HIGH(color, shift);