net_dma: acquire/release dma channels on ifup/ifdown
The recent dmaengine rework removed the capability to remove dma device driver modules while net_dma is active. Rather than notify dmaengine-clients that channels are trying to be removed, we now rely on clients to notify dmaengine when they no longer have a need for channels. Teach net_dma to release channels by taking dmaengine references at netdevice open and dropping references at netdevice close. Acked-by:Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by:
Dan Williams <dan.j.williams@intel.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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47fd23fe
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