[PATCH] backing-dev: Handle class_create() failure

From: Anton Blanchard
Date: Fri Apr 02 2010 - 03:32:51 EST

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 <anton@xxxxxxxxx>

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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