[PATCH] Bug in 2.6.10 mtd driver for physmem mapped flash chips

[K.F.J. Martens]

The patch below fixes a small but fatal bug in the code that handles
non-buswidth-aligned writes. The problem is that the code used the same
index in both map_word and buf, therefore putting the wrong words in the
map_word that partially contains old data and partially contains new
data. The result: corrupt data is being written.

Signed-off-by: Koen Martens <kmartens at sonologic.nl>

--- linux-2.6.10/include/linux/mtd/map.h        2004-12-24 22:34:31.000000000 +0100
+++ linux-2.6.10-gmc/include/linux/mtd/map.h    2004-12-27 15:59:02.631211329 +0100
@@ -322,7 +322,7 @@ static inline map_word map_word_load_par
                        bitpos = (map_bankwidth(map)-1-i)*8;
 #endif
                        orig.x[0] &= ~(0xff << bitpos);
-                       orig.x[0] |= buf[i] << bitpos;
+                       orig.x[0] |= buf[i-start] << bitpos;
                }
        }
        return orig;

-- 
K.F.J. Martens, Sonologic, http://www.sonologic.nl/
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