Comment # 3 on bug 982991 from Dr. Werner Fink

(In reply to Takashi Iwai from comment #2)

Depends on the point of view.  Currently the device a) nameing scheme and its
b) renamings in the kernel is not a) valid nor b) race free.  If a) would be
valid which is that is would be deterministic then b) wouldn't be required from
the point of view from the side of the user space. For b) I can remember a bug
(AFAICR bsc#961908 in comment
https://bugzilla.suse.com/show_bug.cgi?id=961908#c16) where loading a kernel
module for a 4 port and 2 port card the renaming had broken down ... which had
required a hand crafted 70-persistent-net.rules to get the MAC address order
into the order of the device names.