On Sat, Feb 25, 2017 at 10:38 PM, Logan Gunthorpe [off-list ref] wrote:

From: Dan Williams <redacted>

If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.

As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.

Fixes: ba09c01d2fa8 ("dax: convert to the cdev api")
Cc: <redacted>
Cc: Logan Gunthorpe <logang@deltatee.com>
Reported-by: Jason Gunthorpe <redacted>
Signed-off-by: Dan Williams <redacted>

Since you are forwarding this patch you should add

"Signed-off-by: Logan Gunthorpe [off-list ref]"

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