We have to switch to ro mode to guarantee that upon next UBI attach
all data is consistent.

Signed-off-by: Richard Weinberger <rich...@nod.at>
---
 drivers/mtd/ubi/fastmap.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 8b95c48..3d913f5 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -1466,8 +1466,10 @@ err:
        ret = 0;
        if (old_fm) {
                ret = invalidate_fastmap(ubi, old_fm);
-               if (ret < 0)
+               if (ret < 0) {
                        ubi_err(ubi, "Unable to invalidiate current fastmap!");
+                       ubi_ro_mode(ubi);
+               }
                else if (ret)
                        ret = 0;
        }
-- 
1.8.4.5

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