1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index a7571508fdab..e26fe12b1aae 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1114,8 +1114,11 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
         ubi_msg(ubi, "detaching mtd%d", ubi->mtd->index);
 #ifdef CONFIG_MTD_UBI_FASTMAP
         /* If we don't write a new fastmap at detach time we lose all
-         * EC updates that have been made since the last written fastmap. */
-        ubi_update_fastmap(ubi);
+         * EC updates that have been made since the last written fastmap.
+         * In case of fastmap debugging we omit the update to simulate an
+         * unclean shutdown. */
+        if (!ubi_dbg_chk_fastmap(ubi))
+                ubi_update_fastmap(ubi);
 #endif
         /*
          * Before freeing anything, we have to stop the background thread to