From: Anton Blanchard on

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(a)>

Index: linux-2.6/drivers/char/mem.c
--- linux-2.6.orig/drivers/char/mem.c 2010-02-02 22:18:02.000000000 -0600
+++ linux-2.6/drivers/char/mem.c 2010-02-02 22:18:15.000000000 -0600
@@ -901,6 +901,9 @@ static int __init chr_dev_init(void)
printk("unable to get major %d for memory devs\n", MEM_MAJOR);

mem_class = class_create(THIS_MODULE, "mem");
+ if (IS_ERR(mem_class))
+ return PTR_ERR(mem_class);
mem_class->devnode = mem_devnode;
for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
if (!devlist[minor].name)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo(a)
More majordomo info at
Please read the FAQ at