[PATCH 4.9 38/83] dm space map metadata: fix missing store of apply_bops() return value

[Greg Kroah-Hartman]

From: ZhangXiaoxu <zhangxiao...@huawei.com>

commit ae148243d3f0816b37477106c05a2ec7d5f32614 upstream.

In commit 6096d91af0b6 ("dm space map metadata: fix occasional leak
of a metadata block on resize"), we refactor the commit logic to a new
function 'apply_bops'.  But when that logic was replaced in out() the
return value was not stored.  This may lead out() returning a wrong
value to the caller.

Fixes: 6096d91af0b6 ("dm space map metadata: fix occasional leak of a metadata 
block on resize")
Cc: sta...@vger.kernel.org
Signed-off-by: ZhangXiaoxu <zhangxiao...@huawei.com>
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/md/persistent-data/dm-space-map-metadata.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -248,7 +248,7 @@ static int out(struct sm_metadata *smm)
        }
 
        if (smm->recursion_count == 1)
-               apply_bops(smm);
+               r = apply_bops(smm);
 
        smm->recursion_count--;