mtd->read returns the number of bitflips as positive numbers.
Instead of returning these numbers Return -EUCLEAN when the bitflip
threshold has been reached, 0 otherwise.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/mtd/core.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/core.c b/drivers/mtd/core.c
index 0abe667..fc2ac00 100644
--- a/drivers/mtd/core.c
+++ b/drivers/mtd/core.c
@@ -313,7 +313,20 @@ int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
u_char *buf)
{
- return mtd->read(mtd, from, len, retlen, buf);
+ int ret_code;
+ *retlen = 0;
+
+ /*
+ * In the absence of an error, drivers return a non-negative integer
+ * representing the maximum number of bitflips that were corrected on
+ * any one ecc region (if applicable; zero otherwise).
+ */
+ ret_code = mtd->read(mtd, from, len, retlen, buf);
+ if (unlikely(ret_code < 0))
+ return ret_code;
+ if (mtd->ecc_strength == 0)
+ return 0; /* device lacks ecc */
+ return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0;
}
int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
--
1.8.5.1
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