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mtd: nand: s3c2410: fix bug in s3c2410_nand_correct_data() 

If there is only one bit difference in the ECC, the function should
return 1.
The result of "diff0 & ~(1<<fls(diff0))" is equal to diff0, so the
function actually returns -1.

Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Zhaoxiu Zeng 2016-04-12 15:30:35 +08:00 committed by Boris Brezillon
parent 7a65417216
commit 03a9755094
1 changed files with 2 additions and 1 deletions
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3
drivers/mtd/nand/s3c2410.c
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@ -542,7 +542,8 @@ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
diff0 |= (diff1 << 8);
diff0 |= (diff2 << 16);
if ((diff0 & ~(1<<fls(diff0))) == 0)
/* equal to "(diff0 & ~(1 << __ffs(diff0)))" */
if ((diff0 & (diff0 - 1)) == 0)
return 1;
return -1;