> The msg comes from net/core/dev.c, and this device is using the Cisco HDLC
> protocol in drivers/net/hdlc.c . However, AFAIK, 0008 and 0608 represent
> IP and ARP (respectively), not Cisco HDLC. So ...
>
> What I'd like to know is: what exactly causes this msg?? It seems that
> it's printed when someone sends a packet without properly setting
> skb->nh.raw first, but who's supposed to set skb->nh.raw?? The HW driver??
> The data link (HDLC) driver?? The kernel protocol drivers? How should I go
> about fixing this problem, where should I start??
It should be set before netif_rx() is called on the packet. Typically that
means the driver or its support code sets protocol and nh.raw and if a
second header is pulled up then they are set again by whichever code does that
and calls netif_rx again
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