tree 84ff8e44e5b44bbe3c388eded5c3e28bf0bd2375
parent 47fd23fe8efeea3af4593a8424419df48724eb25
author Dan Williams <dan.j.williams@intel.com> 1231662039 -0800
committer David S. Miller <davem@davemloft.net> 1231662039 -0800

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>