+ if (diff0 == 0 && diff1 == 0 && diff2 == 0)
+ return 0; /* ECC is ok */
+
+ /* Can we correct this ECC (ie, one row and column change).
+ * Note, this is similar to the 256 error code on smartmedia */
+
+ if (((diff0 ^ (diff0 >> 1)) & 0x55) == 0x55 &&
+ ((diff1 ^ (diff1 >> 1)) & 0x55) == 0x55 &&
+ ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) {
+ /* calculate the bit position of the error */
+
+ bit = ((diff2 >> 3) & 1) |
+ ((diff2 >> 4) & 2) |
+ ((diff2 >> 5) & 4);
+
+ /* calculate the byte position of the error */
+
+ byte = ((diff2 << 7) & 0x100) |
+ ((diff1 << 0) & 0x80) |
+ ((diff1 << 1) & 0x40) |
+ ((diff1 << 2) & 0x20) |
+ ((diff1 << 3) & 0x10) |
+ ((diff0 >> 4) & 0x08) |
+ ((diff0 >> 3) & 0x04) |
+ ((diff0 >> 2) & 0x02) |
+ ((diff0 >> 1) & 0x01);
+
+ dev_dbg(info->device, "correcting error bit %d, byte %d\n",
+ bit, byte);
+
+ dat[byte] ^= (1 << bit);
+ return 1;
+ }
+
+ /* if there is only one bit difference in the ECC, then
+ * one of only a row or column parity has changed, which
+ * means the error is most probably in the ECC itself */
+
+ diff0 |= (diff1 << 8);
+ diff0 |= (diff2 << 16);
+
+ if ((diff0 & ~(1<<fls(diff0))) == 0)
+ return 1;