2.6.34 Crash in dmaengine_put()

[Jeffrey Merkey]

If someone sets the IFF_UP flags in the netdev structure without going
through ifup userspace stuff, during unregister of the the netdev
the dmaengine-put code will decrement the reference counter negative,
and crash at BUG! in the driver/dma/dmaengine.c code.  This seems
busted.

Jeff
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