linux-kernel - [PATCH block/for-4.2/writeback] bdi: fix wrong error return value in cgwb

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Message-ID: <20150604212051.GV20091@mtj.duckdns.org>
Date:	Fri, 5 Jun 2015 06:20:51 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH block/for-4.2/writeback] bdi: fix wrong error return value in
 cgwb_create()

On wb_congested_get_create() failure, cgwb_create() forgot to set @ret
to -ENOMEM ending up returning 0.  Fix it so that it returns -ENOMEM.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 mm/backing-dev.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 887d72a8..436bb53 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -554,8 +554,10 @@ static int cgwb_create(struct backing_dev_info *bdi,
 		goto err_ref_exit;
 
 	wb->congested = wb_congested_get_create(bdi, blkcg_css->id, gfp);
-	if (!wb->congested)
+	if (!wb->congested) {
+		ret = -ENOMEM;
 		goto err_fprop_exit;
+	}
 
 	wb->memcg_css = memcg_css;
 	wb->blkcg_css = blkcg_css;
--
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