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From b6817bed9516a65276ee92437697cb46136df882 Mon Sep 17 00:00:00 2001
From: mokopatches <mokopatches@openmoko.org>
Date: Sun, 13 Apr 2008 07:23:57 +0100
Subject: [PATCH] fix-hwecc-2410.patch
 S3C24xx ECC mis-calculates the bit to flip:
 http://lists.infradead.org/pipermail/linux-mtd/2007-October/019586.html
 If the error couldn't be corrected, we returned "no problem" :-(
 http://lists.infradead.org/pipermail/linux-mtd/2007-October/019615.html

Signed-off-by: Werner Almesberger <werner@openmoko.org>
---
 drivers/mtd/nand/s3c2410.c |   28 +++++++++++++---------------
 1 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index f83bed9..f7dd4e0 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -364,23 +364,21 @@ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
 	    ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) {
 		/* calculate the bit position of the error */
 
-		bit  = (diff2 >> 2) & 1;
-		bit |= (diff2 >> 3) & 2;
-		bit |= (diff2 >> 4) & 4;
+		bit  = ((diff2 >> 3) & 1) |
+		       ((diff2 >> 4) & 2) |
+		       ((diff2 >> 5) & 4);
 
 		/* calculate the byte position of the error */
 
-		byte  = (diff1 << 1) & 0x80;
-		byte |= (diff1 << 2) & 0x40;
-		byte |= (diff1 << 3) & 0x20;
-		byte |= (diff1 << 4) & 0x10;
-
-		byte |= (diff0 >> 3) & 0x08;
-		byte |= (diff0 >> 2) & 0x04;
-		byte |= (diff0 >> 1) & 0x02;
-		byte |= (diff0 >> 0) & 0x01;
-
-		byte |= (diff2 << 8) & 0x100;
+		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);
@@ -399,7 +397,7 @@ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
 	if ((diff0 & ~(1<<fls(diff0))) == 0)
 		return 1;
 
-	return 0;
+	return -EBADMSG;
 }
 
 /* ECC functions
-- 
1.5.6.5