[dm-devel] [PATCH] dm-writecache: crash on invalid returned status

[Mikulas Patocka]

If some "writecache_map_*" function returns invalid status, it is a bug.
So, we should report it and not fail silently.

Signed-off-by: Mikulas Patocka <mpatocka at redhat.com>

---
 drivers/md/dm-writecache.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/md/dm-writecache.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-writecache.c	2021-07-27 15:29:19.000000000 +0200
+++ linux-2.6/drivers/md/dm-writecache.c	2021-07-27 15:37:30.000000000 +0200
@@ -1585,10 +1585,13 @@ done:
 		return DM_MAPIO_SUBMITTED;
 
 	case WC_MAP_ERROR:
-	default:
 		wc_unlock(wc);
 		bio_io_error(bio);
 		return DM_MAPIO_SUBMITTED;
+
+	default:
+		BUG();
+		return -1;
 	}
 }