From: Anton Blanchard <anton@samba.org>
Date: Fri, 2 Apr 2010 07:46:55 +0000 (+0200)
Subject: backing-dev: Handle class_create() failure
X-Git-Tag: upstream/snapshot3+hdmi~14852^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=144214537370b4f133a735446ebe86e90cfb2501;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

backing-dev: Handle class_create() failure

I hit this when we had a bug in IDR for a few days. Basically sysfs would
fail to create new inodes since it uses an IDR and therefore class_create would
fail.

While we are unlikely to see this fail we may as well handle it instead of
oopsing.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 0e8ca03..f13e067 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -227,6 +227,9 @@ static struct device_attribute bdi_dev_attrs[] = {
 static __init int bdi_class_init(void)
 {
 	bdi_class = class_create(THIS_MODULE, "bdi");
+	if (IS_ERR(bdi_class))
+		return PTR_ERR(bdi_class);
+
 	bdi_class->dev_attrs = bdi_dev_attrs;
 	bdi_debug_init();
 	return 0;