dm: test return value for DM_MAPIO_SUBMITTED

In properly written code we should not assume that DM_MAPIO_SUBMITTED is
zero. We should test the return value for DM_MAPIO_SUBMITTED rather than
testing it for zero.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0d7ab20..0907d9e 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1466,7 +1466,7 @@ static void __map_bio(struct dm_target_io *tio)
                md = tio->io->md;
                dec_pending(tio->io, r);
                free_tio(md, tio);
-       } else if (r) {
+       } else if (r != DM_MAPIO_SUBMITTED) {
                DMWARN("unimplemented target map return value: %d", r);
                BUG();
        }