[PATCH 06/14] ubi: fastmap: Handle bad block count for preseeded fastmap case

[Richard Weinberger]

If the fastmap is preseeded the bad block count is created while
scanning for bad blocks in the PEB fixup code.

Signed-off-by: Richard Weinberger <rich...@nod.at>
---
 drivers/mtd/ubi/fastmap.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 279d02874297..69b855b3cf2a 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -725,7 +725,16 @@ static int ubi_attach_fastmap(struct ubi_device *ubi,
        }
 
        ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
-       ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
+
+       if (fm->flags & UBI_FM_SB_PRESEEDED_FLG) {
+               /* When we have a preseeded Fastmap we cannot use the provided 
bad block number */
+               if (be32_to_cpu(fmhdr->bad_peb_count) != 0) {
+                       ubi_err(ubi, "Bad block count in preseeded Fastmap is 
non-zero");
+                       goto fail_bad;
+               }
+       } else {
+               ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
+       }
 
        /* Iterate over all volumes and read their EBA table */
        for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
-- 
2.13.6