Re: [crash] kernel BUG at net/core/dev.c:1328!

From: David Miller
Date: Mon Jul 21 2008 - 16:11:42 EST

From: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
Date: Mon, 21 Jul 2008 21:20:20 +0200

> In the meantime: Is there perhaps something obviously wrong with
> drivers/ieee1394/eth1394.c's netdevice initialization? We do it in
> ether1394_add_host(), and shortly thereafter the crashing
> ether1394_host_reset() is called. So we have essentially
> (add host)
> dev = alloc_netdev(...);
> initialize various members in dev...
> register_netdev(dev);
> (host reset)
> netif_stop_queue(dev);
> discard some stale 1394 stuff if there were some...
> netif_wake_queue(dev); <-- crashes in __netif_schedule(dev);

You should only do a netif_stop_queue() in your device
initialization, at the very end of ->open() processing
when you've fully committed to returning success.

You should not, in particular, be doing a netif_wake_queue()
before you've even done a netif_start_queue().

Many of these drivers are using netif_{stop,wake}_queue()
to stop packet flow, in particular when link state changes,
and netif_carrier_{on,off}() already does all of that for

Really, anything outside of:

1) netif_start_queue() in ->open()
2) netif_stop_queue() in ->stop()
3) netif_{stop,wake}_queue() in the TX packet handling path

is superfluous.
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