From a536093a2f07007aa572e922752b7491b9ea8ff2 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Fri, 31 Mar 2006 02:31:54 -0800 Subject: [PATCH] [PATCH] fbcon: Fix big-endian bogosity in slow_imageblit() The monochrome->color expansion routine that handles bitmaps which have (widths % 8) != 0 (slow_imageblit) produces corrupt characters in big-endian. This is caused by a bogus bit test in slow_imageblit(). Fix. This patch may deserve to go to the stable tree. The code has already been well tested in little-endian machines. It's only in big-endian where there is uncertainty and Herbert confirmed that this is the correct way to go. It should not introduce regressions. Signed-off-by: Antonino Daplas Acked-by: Herbert Poetzl Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/cfbimgblt.c | 2 +- include/linux/fb.h | 2 -- 2 files changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/video/cfbimgblt.c b/drivers/video/cfbimgblt.c index 910e2338a2..8ba6152db2 100644 --- a/drivers/video/cfbimgblt.c +++ b/drivers/video/cfbimgblt.c @@ -169,7 +169,7 @@ static inline void slow_imageblit(const struct fb_image *image, struct fb_info * while (j--) { l--; - color = (*s & 1 << (FB_BIT_NR(l))) ? fgcolor : bgcolor; + color = (*s & (1 << l)) ? fgcolor : bgcolor; val |= FB_SHIFT_HIGH(color, shift); /* Did the bitshift spill bits to the next long? */ diff --git a/include/linux/fb.h b/include/linux/fb.h index d03fadfcaf..315d89740d 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -839,12 +839,10 @@ struct fb_info { #define FB_LEFT_POS(bpp) (32 - bpp) #define FB_SHIFT_HIGH(val, bits) ((val) >> (bits)) #define FB_SHIFT_LOW(val, bits) ((val) << (bits)) -#define FB_BIT_NR(b) (7 - (b)) #else #define FB_LEFT_POS(bpp) (0) #define FB_SHIFT_HIGH(val, bits) ((val) << (bits)) #define FB_SHIFT_LOW(val, bits) ((val) >> (bits)) -#define FB_BIT_NR(b) (b) #endif /* -- 2.39.5