[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>

diff --git a/drivers/video/cfbimgblt.c b/drivers/video/cfbimgblt.c
index da664ce..a7770c4 100644 (file)
--- a/drivers/video/cfbimgblt.c
+++ b/drivers/video/cfbimgblt.c
@@ -80,10 +80,12 @@ static u32 cfb_tab32[] = {
 #define LEFT_POS(bpp)          (32 - bpp)
 #define SHIFT_HIGH(val, bits)  ((val) >> (bits))
 #define SHIFT_LOW(val, bits)   ((val) << (bits))
+#define BIT_NR(b)              (7 - (b))
 #else
 #define LEFT_POS(bpp)          (0)
 #define SHIFT_HIGH(val, bits)  ((val) << (bits))
 #define SHIFT_LOW(val, bits)   ((val) >> (bits))
+#define BIT_NR(b)              (b)
 #endif
 
 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--) {
                        l--;
-                       color = (*s & (1 << l)) ? fgcolor : bgcolor;
+                       color = (*s & 1 << (BIT_NR(l))) ? fgcolor : bgcolor;
                        color <<= LEFT_POS(bpp);
                        val |= SHIFT_HIGH(color, shift);