Benjamin Herrenschmidt wrote:

We must not call dev_mc_add() from within our HW configure which happens
before we initialize and register the netdev. Do it in open() instead.

Thanks to Sebastian Siewior for tracking it down. 

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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This fixes an uninitialized spinlock warning (and possibly more).

Please apply.

applied