[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, 5 insertions, 2 deletions

diff --git a/drivers/mtd/inftlcore.c b/drivers/mtd/inftlcore.c
index efb1a95aa0a0..1e21a2c3dd29 100644
--- a/drivers/mtd/inftlcore.c
+++ b/drivers/mtd/inftlcore.c
@@ -355,7 +355,7 @@ static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned
                 ret = mtd->read(mtd, (inftl->EraseSize * BlockMap[block]) +
                                 (block * SECTORSIZE), SECTORSIZE, &retlen,
                                 movebuf);
-                if (ret < 0) {
+                if (ret < 0 && ret != -EUCLEAN) {
                         ret = mtd->read(mtd,
                                         (inftl->EraseSize * BlockMap[block]) +
                                         (block * SECTORSIZE), SECTORSIZE,
@@ -922,7 +922,10 @@ foundit:
         } else {
                 size_t retlen;
                 loff_t ptr = (thisEUN * inftl->EraseSize) + blockofs;
-                if (mtd->read(mtd, ptr, SECTORSIZE, &retlen, buffer))
+                int ret = mtd->read(mtd, ptr, SECTORSIZE, &retlen, buffer);
+
+                /* Handle corrected bit flips gracefully */
+                if (ret < 0 && ret != -EUCLEAN)
                         return -EIO;
         }
         return 0;