From: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed, 1 Jul 2015 21:30:36 +0000 (-0400)
Subject: dm: test return value for DM_MAPIO_SUBMITTED
X-Git-Tag: v4.3-rc1~97^2~9
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=ab37844d6169c2dd6f96e665b07b692ba1a4c180;p=linux-2.6-block.git

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 0d7ab20c58df..0907d9eb864e 100644
--- 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();
 	}