[MTD] NAND Signal that a bitflip was corrected by ECC

Return -EUCLEAN on read when a bitflip was detected and corrected, so the
clients can react and eventually copy the affected block to a spare one.
Make all in kernel users aware of the change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/mtd/nftlcore.c b/drivers/mtd/nftlcore.c
index f6ffe7949b26..dc7573501d8c 100644
--- a/drivers/mtd/nftlcore.c
+++ b/drivers/mtd/nftlcore.c
@@ -422,7 +422,7 @@ static u16 NFTL_foldchain (struct NFTLrecord *nftl, unsigned thisVUC, unsigned p
 
                 ret = mtd->read(mtd, (nftl->EraseSize * BlockMap[block]) + (block * 512),
                                 512, &retlen, movebuf);
-                if (ret < 0) {
+                if (ret < 0 && ret != -EUCLEAN) {
                         ret = mtd->read(mtd, (nftl->EraseSize * BlockMap[block])
                                         + (block * 512), 512, &retlen,
                                         movebuf);
@@ -768,7 +768,9 @@ static int nftl_readblock(struct mtd_blktrans_dev *mbd, unsigned long block,
         } else {
                 loff_t ptr = (lastgoodEUN * nftl->EraseSize) + blockofs;
                 size_t retlen;
-                if (mtd->read(mtd, ptr, 512, &retlen, buffer))
+                int res = mtd->read(mtd, ptr, 512, &retlen, buffer);
+
+                if (res < 0 && res != -EUCLEAN)
                         return -EIO;
         }
         return 0;