UBI: Fastmap: Ensure that all fastmap work is done upon WL shutdown

...otherwise the deferred work might run after datastructures
got freed and corrupt memory.

Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Guido Martínez <guido@vanguardiasur.com.ar>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index ae174f4ed674..bf66890fefad 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -1856,6 +1856,9 @@ int ubi_thread(void *u)
  */
 static void shutdown_work(struct ubi_device *ubi)
 {
+#ifdef CONFIG_MTD_UBI_FASTMAP
+        flush_work(&ubi->fm_work);
+#endif
         while (!list_empty(&ubi->works)) {
                 struct ubi_work *wrk;