I was poking around in various nic drivers and I noticed that several of them have what seems to be an odd idiom in their generic attach functions. For instance in sys/dev/ed/if_ed.c in ed_attach(), filling in the interface fields and attaching the interface is protected by and "if (!ifp->if_name)". Can someone explain why this is being done? It doesn't seem to make any sense that this could get called twice for the same device (after all you only attach once).
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