ubi: fastmap: Don't flush fastmap work on detach

commit 29b7a6f upstream.

At this point UBI volumes have already been free()'ed and fastmap can no
longer access these data structures.

Reported-by: Martin Townsend <[email protected]>
Fixes: 74cdaf2 ("UBI: Fastmap: Fix memory leaks while closing the WL sub-system")
Cc: [email protected]
Signed-off-by: Richard Weinberger <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: richardweinberger

drivers/mtd/ubi/fastmap-wl.c

@@ -362,7 +362,6 @@ static void ubi_fastmap_close(struct ubi_device *ubi)
 {
 	int i;
 
-	flush_work(&ubi->fm_work);
 	return_unused_pool_pebs(ubi, &ubi->fm_pool);
 	return_unused_pool_pebs(ubi, &ubi->fm_wl_pool);