Messages in this thread Patch in this message | | | From | zengzhaoxiu@163 ... | Subject | [PATCH] mtd: nand: s3c2410: fix bug in s3c2410_nand_correct_data() | Date | Fri, 8 Apr 2016 00:48:17 +0800 |
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From: Zeng Zhaoxiu <zhaoxiu.zeng@gmail.com>
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.
Here, we can use the simple expression "(diff0 & (diff0 - 1)) == 0" to determine whether the diff0 has only one 1-bit. --- drivers/mtd/nand/s3c2410.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c index 9c9397b..c9698cf 100644 --- a/drivers/mtd/nand/s3c2410.c +++ b/drivers/mtd/nand/s3c2410.c @@ -542,7 +542,7 @@ 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) + if ((diff0 & (diff0 - 1)) == 0) return 1; return -1; -- 2.5.5
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