UBI: erase free PEB with bitflip in EC header

commit 193819cf2e6e395b1e1be2d36785dc5563a6edca upstream.

Without this patch, these PEB are not scrubbed until we put data in them.
Bitflip can accumulate latter and we can loose the EC header (but VID header
should be intact and allow to recover data).

Signed-off-by: Matthieu Castet <matthieu.castet@parrot.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index b99318e..b2b62de 100644 (file)
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -997,7 +997,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si,
                        return err;
                goto adjust_mean_ec;
        case UBI_IO_FF:
-               if (ec_err)
+               if (ec_err || bitflips)
                        err = add_to_list(si, pnum, ec, 1, &si->erase);
                else
                        err = add_to_list(si, pnum, ec, 0, &si->free);