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Date:	Fri, 2 Apr 2010 18:27:49 +1100
From:	Anton Blanchard <>
To:	Andrew Morton <>,
	Jens Axboe <>
Subject: [PATCH] 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

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

Signed-off-by: Anton Blanchard <>

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;
 	return 0;
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