quoted

quoted

-	if (!kref_get_unless_zero(&ctrl->ctrl.kref))
-		return -EBUSY;
+	nvme_get_ctrl(&ctrl->ctrl);

Given that we take this reference before we are protected with
the state change I think this should still be get_unless_zero.

Because we now refcount the device we must have a reference on it
when we call the sysfs file for it, and for the fabrics file
we have an explicit reference already.  So there should not be
any need to do the unless_zero.

I don't think the fabrics device does not help us to keep the ctrl
allocated until we finish removal.

I do agree that the kobj reference in nvme_dev_open keeps it alive.