UBI: Fastmap: Switch to ro mode if invalidate_fastmap() fails

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

Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 8b95c48a002d..3d913f53fd06 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;
         }